Commercial garage door troubleshooting: 38 symptoms, four brands of operator messages, and where you have to stop
Commercial garage door troubleshooting starts by naming the system, not the part. Keep clear of a damaged, crooked or drifting door. Identify the door and operator, record the symptom and any safely visible message, then use the table below. A symptom or code points to the next check—not a confirmed failed part.
Before you check anything
Cone off the bay. Stop forklift and trailer traffic through the opening.
Do not run a door that is crooked, derailed, jammed, or has a slack or broken cable. Keep people clear until trained personnel assess it.
Do not stand or drive under a door that drifts down on its own.
If a label or your equipment records identify a fire door—or release hardware makes you suspect one—go to the fire door section. Do not open a hood or reset a release device to find out. Different rules, different people.
Safety basis: Clopay’s commercial-door warnings, Manaras safety instructions, printed p. 11, and DASMA fire-door guidance. The stop-use routing here is our editorial guidance.
Find your symptom · Read an operator message · Download the bay fault card
Last verified: September 2026 · Data compiled: 17 September 2026 · Dataset: The Commercial Door Fault Ledger v2.0.0 Uptime Dock & Door Research — the research and reference section of uptimedockanddoor.com. Editorial policy · About
We built this page by reading the source documents rather than summarising other people's articles. On 17 September 2026 we checked the cited manufacturer, DASMA and OSHA material and assembled 158 technical reference records plus a 20-row source register. The records cover 38 symptoms, seven mode comparisons, 63 operator-message entries, nine held-button branches and 41 names. The whole table set is available as a download, with sources and verification dates attached to every record.
Two evidence marks appear throughout:
- ★ Source-reported — checked in the cited primary document, with its edition or revision.
- ● Calculated — counted or computed by us from those documents, with the method shown.
Editorial guidance is labelled separately in the files. Our symptom groupings, observations and stop lines are source-grounded advice, not manufacturer diagnoses or measured failure rates.
What's on this page
- Which of these four doors do you have?
- Find your symptom — all 38
- Why your door only closes when you hold the button
- What your operator's control mode means
- How to read your operator's fault codes and status messages
- What you can safely check
- Where you have to stop
- Five symptoms that do not prove the motor is failing
- What to write down before you call
- Fire doors: why this page stops
- How we checked this
- What this does not cover
- Sources
- Download the data
- How to cite this
- Questions people ask
Which of these four doors do you have?
Identify the door before applying an operator chart. This reference covers first observations on sectional doors, rolling-steel service doors and grilles. Fire-door entries stop at identification and handoff; they are not repair or testing instructions. A door can operate normally and still lack usable wind documentation. The commercial garage door wind-load guide explains the label, drawing, and pressure evidence.
Scroll horizontally to view all columns.
| Door type | What it looks like | What it is called in the trade | What this reference covers |
|---|---|---|---|
| Sectional | Horizontal panels hinged together, riding in tracks on rollers; counterbalance arrangements vary. | Sectional door; commonly called an overhead or commercial garage door. | Observation only within the limits on this page. |
| Rolling steel | Interlocking metal slats coil above the opening; the sides run in guides. | Rolling door, rolling service door, roll-up door. | Observation only within the limits on this page. |
| Rolling grille | An open curtain of rods, links or tubes coils above the opening. | Rolling grille. | Observation only; use the correct operator and grille documentation. |
| Rolling fire door | Can resemble an ordinary rolling door. Identify it from labels, equipment records and the installed system—not appearance alone. | Rolling fire door. | Use the fire-door handoff; no reset or repair procedure here. |
Sources: DASMA277; DASMA160; DASMA267. Door terminology and identification; editorial scope column. Checked 17 September 2026. Source-reported facts are model/document-specific; observations and stop lines are editorial guidance.
Fire-door clues are not a one-look test
A readable door label and the equipment records matter more than one piece of hardware. A fusible link or release device is a reason to stop and verify the assembly. The absence of an exposed link does not establish that a door is an ordinary service door.
DASMA marks some rolling-door terms with an asterisk for fire-door terminology:
- Fusible link — two pieces of metal joined with low-melting-point solder.
- Dropout — a weighted device associated with releasing the drive for automatic closing.
- Flame baffle — a hinged metal piece inside the hood that closes the gap above the curtain when released. Do not open the hood to look for one.
- Governor — controls descent speed. DASMA does not put the fire-only asterisk beside this term.
Sources: DASMA277; DASMA267. D277 entries Dropout, Fusible Link, Flame Baffle and Governor; D267 fire-door labels. Checked 17 September 2026. Source-reported facts are model/document-specific; observations and stop lines are editorial guidance.
A few terms to keep straight, because people mix them up on the phone:
- Operator — the powered mechanism that moves the door. Not the door.
- Trolley operator (also called a drawbar operator) — mounts overhead and pushes and pulls the top section.
- Jackshaft operator — drives the door’s shaft rather than a trolley attached to the top section. See S17 in the ledger.
- Cycle — one full trip: fully closed, to fully open, and back to fully closed. A controller’s counting convention still needs its own manual.
If the operator is being replaced rather than diagnosed, compare commercial garage door opener types before treating trolley, jackshaft and hoist quotes as equivalent.
★ Source-reported: DASMA #160 and #277 define a cycle this way. Operator application: DASMA #1501.
Other terms used below: the counterbalance offsets the door’s weight; a photoeye detects interruption of a light beam; a sensing edge responds at the moving door edge. Monitored protection feeds back information about the protection system. A limit marks a travel position. An interlock prevents operation under a specified condition. Constant contact/constant pressure means holding a control; momentary means a brief press. An LED is an indicator light; RPM feedback reports motor/drive movement. TCM means Timer Close Module and FDM means Fire Door Module. A normally closed stop circuit is complete in its normal state and opens to signal stop. A brownout is a low-supply-voltage condition. An inductive loop is a vehicle-detection input. A centrifugal switch is a motor switch operated by rotational speed. These names identify functions, not proof of a failed part. Device definitions · Operator terminology and messages.
Find your symptom — all 38
This is the core of the page. Find what your door is actually doing, in the words you'd use yourself.
Read the fourth column. A symptom, a fault code, and a diagnosis are three different things. A humming sound does not establish correct supply voltage or identify the part at fault. It does not tell you the capacitor failed. Report what happened before deciding what needs replacing.
Source keys in the last column link to the actual documents and resolve in Sources. Manufacturer facts apply only to the named platform and edition in the downloads. Possible explanations are not ranked by frequency. A “safe observation” never requires running a faulty door, entering its travel path or opening a control enclosure.
Group A — The door will not close
Scroll horizontally to view all columns.
| Symptom | Documented context—not a diagnosis | Safe observation | What it does not tell you | Stop line | Source |
|---|---|---|---|---|---|
| S01 Opens fine, but only goes down while I hold the button | Configured held-button closing, or a monitored-protection restriction. Behaviour alone cannot distinguish them. | Use posted instructions and existing records; record only an externally visible indication. | That a photo eye failed — or that anything is broken at all. | Do not change modes or use newly required held-button closing as a workaround. | DASMA382; LM-L5; MAN-070E; GENIE-TC; MIC-SMART |
| S02 Starts down, then reverses all the way back up | A safety input or an obstruction can cause reversal; the active input depends on the controller. | From outside the travel path, record visible obstructions and the message already displayed. | Which device reacted, or whether a part needs replacement. | Do not walk under the door, defeat a sensor or repeat the fault to test it. | DASMA382; GENIE-TC; LM-L5 |
| S03 Will not move down at all, but opening works | An active stop/protection input or a travel-limit condition can restrict closing. | Record the complete accessible message and whether the failure is new. | Which physical device or wire is at fault. | Trained assessment before changing limits, wiring or modes. | LM-L5; GENIE-TC; MAN-070E |
| S04 Stops a few inches off the floor, then goes back up | Obstruction/safety response and travel settings need to be distinguished. | Note the observed stopping height; inspect the floor only from a safe position outside the opening. | That a limit adjustment is the fix. | Do not force a close or adjust travel limits. | LM-L5; GENIE-TC; DASMA269 |
| S05 Closes from the wall button but not from the remote | Radio compatibility, programming and control mode are separate from the door motor. | Record which local control previously worked; identify the remote and operator from safe labels or records. | That the receiver failed. On a named Genie platform this can be a setting. | No board access or mode changes; use the exact remote/operator manual. | GENIE-TC; LM-L5 |
| S06 Only starts closing a few seconds after I press and hold | The checked LiftMaster Logic 5.0 manual describes a delayed closing override for E7. | Record a delay already observed and any accessible indicator; do not hold the button to reproduce it. | Which device failed, or that continued use is safe. | Trained assessment; the override is not a repair. | LM-L5 |
| S07 Works all morning, reverses on sunny afternoons | The time pattern is useful evidence; the checked general sensor sheet does not identify its cause. | Record the time, lighting/weather and any safely visible sensor indication. | That sunlight, a bracket or a failed sensor is the cause. | Do not move, shield, bypass or replace sensors on this evidence alone. | DASMA382 |
| S08 Closes, but leaves a gap at the floor on one side | Visible bottom-bar/section damage, sealing and alignment need assessment. | Stand back and sight along the bottom edge against the floor line. | That the cable drums are the cause. | Do not adjust drums, cables or bottom brackets. | DASMA269; CLOPAY; DASMA160 |
A door that only closes while the button is held may be using its configured close mode or a monitored-protection fallback; see the source crosswalk for UL 325 commercial door requirements.
Sources: DASMA382; LM-L5; MAN-070E; GENIE-TC; MIC-SMART; DASMA269; CLOPAY; DASMA160. Exact model, edition and row locator are included in symptom-ledger.csv. Checked 17 September 2026. Source-reported facts are model/document-specific; observations and stop lines are editorial guidance.
Group B — The door will not move
Scroll horizontally to view all columns.
| Symptom | Documented context—not a diagnosis | Safe observation | What it does not tell you | Stop line | Source |
|---|---|---|---|---|---|
| S09 Nothing happens when I press any button | Power, stop inputs and interlocks are separate possibilities in the operator manuals. | Record accessible indicators and visible lock/hoist status without changing them. | That the motor or control board has failed. | Qualified diagnosis; do not bypass a lock/interlock or open an electrical enclosure. | LM-L5; MAN-070E; GENIE-TC |
| S10 Motor hums or buzzes, door does not move | A hum or click does not establish the supply condition or the failed component. | Record the sound and command already observed, without repeating the attempt or touching the motor. | That the capacitor failed, or that the door can be forced open. | Stop repeated attempts; qualified electrical/mechanical assessment. | LM-L5; GENIE-TC |
| S11 Motor runs normally, door does not move | Drive connection, clutch and door movement require an equipment-specific check. | Record whether a motor sound was heard and whether any door movement was seen. | Which drive part failed. | Do not jog the operator, remove guards or watch exposed drive parts. | LM-L5; CLOPAY |
| S12 Moves about a foot, stops, and after that only constant pressure works | On the checked LiftMaster platform, loss of opening motion feedback can produce this behaviour. | Record the distance already observed and the accessible maintenance-light pattern. | That the RPM sensor, clutch or board is definitely defective. | Trained assessment; do not reproduce the motion or relearn feedback yourself. | LM-L5 |
| S13 Stops most of the way, and a second press finishes it | Maximum run time is one documented explanation, not a diagnosis from a second successful press. | Record the original sequence and any run-timer code. | That increasing the timer would fix the underlying problem. | Do not time repeated cycles or change the timer to overcome a fault. | LM-L5; MAN-070E; GENIE-TC |
| S14 Opens partway and stops at the same height every time | A programmed intermediate stop is possible; a newly shortened opening still needs investigation. | Compare the observed stopping position with posted instructions or previous records. | That a mid-stop was intentionally programmed, or that the installation is healthy. | Do not change settings to mask a new travel problem. | LM-L5; MAN-070E; GENIE-TC; MIC-SMART |
Sources: LM-L5; MAN-070E; GENIE-TC; CLOPAY; MIC-SMART. Exact model, edition and row locator are included in symptom-ledger.csv. Checked 17 September 2026. Source-reported facts are model/document-specific; observations and stop lines are editorial guidance.
Group C — Counterbalance (springs and cables)
This group involves stored energy and heavy moving equipment. Springs and connected lifting hardware can be under very high tension. Do not touch or adjust them. Look from a safe position, record, and step back. Clopay’s warning.
Scroll horizontally to view all columns.
| Symptom | Documented context—not a diagnosis | Safe observation | What it does not tell you | Stop line | Source |
|---|---|---|---|---|---|
| S15 Loud bang, and now the door is far too heavy to lift | A bang and changed lifting behaviour warrant inspection of the counterbalance and lifting hardware. | Record the sound and any break or spring gap visible from a safe position. If a spring color is also visible from there, see the spring color code chart as a reference. | Which component broke, or that remaining hardware can support the door. | Stop use; no manual lift, release or spring/cable work. | CLOPAY; DASMA160 |
| S16 Hangs crooked or at an angle in the opening | Crooked travel can involve the door, guides/tracks or lifting hardware. | Record visible position and damage from outside the opening. | That a single cable replacement is sufficient. | Keep clear; no cycling, lifting or cable/drum adjustments. | CLOPAY; DASMA269 |
| S17 A cable is off the drum or hanging slack | Jackshaft applications need suitable cable tension; the door/application must be assessed together. | Record whether slack was visible and identify the operator from records. | Why the cable went slack or what setting should change. | Stop use; no cable reseating or improvised added weights/springs. | DASMA1501; CLOPAY |
| S18 Drifts down by itself after being stopped partway | A door that descends unexpectedly needs assessment of its support and operating system. | Report the drift already observed and its position; keep the opening clear. | Whether the spring, brake or another component is responsible. | Stop use; do not stand under it or test its holding ability again. | CLOPAY; DASMA269 |
| S19 Will not stay open when released by hand | A balance problem is possible; added weight can change a sectional door’s counterbalance needs. | Report the manual behaviour already observed and any known added material or recent work. | That the springs simply need more turns. | Do not disconnect, lift or rebalance the suspect door. | CLOPAY; DASMA176 |
| S20 Very hard to lift by hand with the operator disconnected | Hard manual movement needs a door-system assessment, not greater pulling force. | Record any difficulty already encountered; do not repeat a manual test. | Which component is binding. | No release/hoist or under-door work on a suspect assembly. | CLOPAY; DASMA269 |
| S21 Bottom section is bowed and the door will not seal | Visible impact damage needs inspection of the assembly, not just the dent. | Photograph the visible damage from outside the travel path. | Whether a section, bracket, track or complete assembly needs replacement. | Stop use where damage affects travel or support; do not straighten components. | CLOPAY; DASMA269 |
Sources: CLOPAY; DASMA160; DASMA269; DASMA1501; DASMA176. Exact model, edition and row locator are included in symptom-ledger.csv. Checked 17 September 2026. Source-reported facts are model/document-specific; observations and stop lines are editorial guidance.
Group D — Track, guides and curtain
Scroll horizontally to view all columns.
| Symptom | Documented context—not a diagnosis | Safe observation | What it does not tell you | Stop line | Source |
|---|---|---|---|---|---|
| S22 Binds or sticks partway through travel | Track/guide condition and visible debris are relevant observations. | Note visible damage or debris without reaching into the travel path. | That removing debris makes the whole assembly safe. | Do not unjam, bend tracks or force travel. | CLOPAY; DASMA269 |
| S23 Came out of the track, or the rollers are off | A derailed roller or displaced section requires a trained door-system assessment. | Record the position without moving the door. | That reseating one roller is the complete repair. | Stop use; no cycling or reseating. | CLOPAY |
| S24 Rolling door curtain jammed in the guides | Rolling-door guides, curtain, endlocks and bottom bar are separate inspection points. | Record where it was seen to bind; inspect only externally visible damage. | Which hidden part is causing the jam. | Do not pull slats, open the hood or force the curtain. | DASMA269; DASMA277 |
| S25 Grinding, shrieking or squealing while it runs | A new noise is useful symptom information, not proof that one part needs lubrication. | Describe when the sound occurred; no repeat cycles to locate it. | Which bearing, roller or drive component is responsible. | Stop use if movement is abnormal; no guard removal or hands-on diagnosis. | CLOPAY; DASMA269 |
| S26 Shudders or shakes as it travels | Shaking or jerking requires inspection of the door and operator together. | Report the motion already observed and any visible wear or damage. | That the motor alone is at fault. | Do not run a complete cycle to demonstrate it. | CLOPAY; DASMA269 |
| S27 Slats have shifted sideways on a rolling door | Endlocks restrain lateral movement of rolling-steel slats; the complete curtain/guides need inspection. | Photograph displaced slats only as they already sit, from a safe position. | That an endlock is the only failed part. | Do not reposition the curtain or remove the hood. | DASMA277; DASMA269 |
Sources: CLOPAY; DASMA269; DASMA277. Exact model, edition and row locator are included in symptom-ledger.csv. Checked 17 September 2026. Source-reported facts are model/document-specific; observations and stop lines are editorial guidance.
Group E — Electrical and control
Scroll horizontally to view all columns.
| Symptom | Documented context—not a diagnosis | Safe observation | What it does not tell you | Stop line | Source |
|---|---|---|---|---|---|
| S28 Breaker trips when the door runs | Electrical protective-device trips and a motor-overheat message are different evidence. | Record which protective device tripped and any message already seen. | That resetting it, waiting or replacing a motor resolves the cause. | Do not repeatedly reset; qualified electrical assessment. For smoke, fire or sparking, follow the site emergency procedure. | OSHA333; LM-L5; GENIE-TC |
| S29 Runs the wrong direction after an electrical repair | Wrong direction after work requires verification of the installed electrical/mechanical setup. | Record the command, direction already observed and what work preceded it. | That swapping two wires is the correct or safe fix. | Stop use; no phase changes, jumper changes or limit resets by the reader. | MAN-070E; LM-L5; GENIE-TC |
| S30 A light on the operator or wall station is flashing a pattern | Indicators can describe normal status, maintenance or a fault, depending on the device and platform. | Write down the complete accessible message, light label, pattern and model. | That a generic blink chart applies. | No cover removal or clearing the message just to see whether it returns. | LM-L5; MAN-070E; GENIE-TC; MIC-SMART |
| S31 Wall station does nothing, but the buttons on the board work | A difference between local control and an earlier board-control test can point to a command-path issue. | Use only a qualified person’s existing report; do not open the box or press board controls. | That the stop circuit or entire wall station is certainly defective. | Qualified electrical/control assessment. | LM-L5; GENIE-TC |
| S32 Opens or closes by itself | Automatic closing can be a configured timer function; unexplained movement is not a normal-status diagnosis. | Compare previously observed behaviour with posted operating instructions and existing records. | That a timer explains every uncommanded movement. | Keep clear; stop use of unexplained operation and have it assessed. | LM-L5; MAN-070E; GENIE-TC; MIC-SMART |
Sources: OSHA333; LM-L5; GENIE-TC; MAN-070E; MIC-SMART. Exact model, edition and row locator are included in symptom-ledger.csv. Checked 17 September 2026. Source-reported facts are model/document-specific; observations and stop lines are editorial guidance.
Group F — Safety devices
Scroll horizontally to view all columns.
| Symptom | Documented context—not a diagnosis | Safe observation | What it does not tell you | Stop line | Source |
|---|---|---|---|---|---|
| S33 The photo eye light is blinking | Sensor indication meanings depend on the exact sensor/controller; beam-height rules apply to identified protection devices. | Record the device label and light pattern from a safe position. | That one colour means healthy across brands, or that a high vehicle detector is the primary protection device. | No sensor relocation, wiring or bypassing. | DASMA382; MAN-070E |
| S34 The sensing edge does nothing when I press it | A closing edge that fails its specified test needs assessment; a photoeye is a different device. | Record the failed test reported by designated personnel; do not perform an improvised object test. | That another working sensor replaces the failed device. | Stop use pending assessment under the exact manufacturer procedure. | DASMA269; DASMA382 |
| S35 The sensing edge stops the door on the way UP | For the closing-edge arrangement discussed by DASMA, reversing on opening is an installation concern. | Report that behaviour if already observed; do not repeat the test. | That the wiring error has been identified without inspection. | Qualified assessment; no wiring changes. | DASMA375 |
Sources: DASMA382; MAN-070E; DASMA269; DASMA375. Exact model, edition and row locator are included in symptom-ledger.csv. Checked 17 September 2026. Source-reported facts are model/document-specific; observations and stop lines are editorial guidance. ★ Source-reported: for the closing-edge arrangement it discusses, DASMA #375, “Examples of Installation Problems” says the edge should act on closing, not opening. It identifies incorrect wiring as a likely explanation—not a diagnosis established from behaviour alone.
Group G — Fire doors
Scroll horizontally to view all columns.
| Symptom | Documented context—not a diagnosis | Safe observation | What it does not tell you | Stop line | Source |
|---|---|---|---|---|---|
| S36 The rolling door came down on its own and will not go back up | A fire door may close following a release signal; unexpected closure still needs the cause established. | Follow the site alarm response; record any known alarm, release or power event. | That the door worked correctly or is merely ready to reset. | No manual reopening, reset or release-device adjustment; trained fire-door assessment. | DASMA277; DASMA299; GENIE-TC |
| S37 A chain hanging with a weight and a small soldered metal link | Fire-release hardware is a clue, not a substitute for the door label and equipment records. | Check labels/records that are safely accessible; do not open the hood to identify components. | The door’s rating, certification or exact type from one piece of hardware. | Treat suspected fire-protection equipment as specialist work until identified. | DASMA277; DASMA267 |
| S38 A fire door operator is showing a trouble light | Fire-module messages can identify a required test or a circuit/power problem. | Record the exact message and module model without clearing it. | That a test-required notice proves the assembly is fault-free. | Trained rolling fire-door personnel; no test-key or reset instructions here. | GENIE-TC; DASMA299 |
Sources: DASMA277; DASMA299; GENIE-TC; DASMA267. Exact model, edition and row locator are included in symptom-ledger.csv. Checked 17 September 2026. Source-reported facts are model/document-specific; observations and stop lines are editorial guidance. These observations are not permission to repair the equipment. A row can help you describe a problem without identifying its cause. Download the data for the full source locators and scope.
Why your door only closes when you hold the button
Held-button closing can be an intended configuration or a response to a problem. The behaviour alone does not tell you which. The useful first distinction is whether it has always worked that way or has just changed.
★ Source-reported: DASMA #382 (Rev 05/22/22) describes two UL 325 arrangements for vehicular commercial door operators manufactured after August 2010: constant-pressure-to-close, or a suitable monitored external entrapment-protection device. It identifies an edge sensor, a photoelectric sensor or a light curtain as the device categories. This is DASMA’s published explanation—not a claim that we have read the complete current UL standard or that a mode setting proves local compliance.
For older equipment, use its exact documentation rather than treating those arrangements as a retrofit instruction. A monitored device gives the system feedback about protection status; a clear-looking doorway is not proof that its circuit is healthy.
Sources: DASMA382. pp. 1–2, introduction and ancillary-protection explanation. Checked 17 September 2026. Source-reported facts are model/document-specific; observations and stop lines are editorial guidance.
The nine branches, and what they actually establish
Scroll horizontally to view all columns.
| # | What you’re seeing | Documented explanation | What it does not establish | Safe information to collect |
|---|---|---|---|---|
| 1 | It has worked this way since the door was installed | Documented constant-pressure configuration is one possibility. | Whether anything is broken, which part failed, or whether continued use is safe. | Record the documented mode and whether held-button closing has always been required. |
| 2 | It was hands-free until recently and now needs the button held | A monitored-protection restriction is one possibility; a blockage is not necessarily a broken component. | Whether anything is broken, which part failed, or whether continued use is safe. | Record the externally visible LMEP indication and any obstruction seen from outside the travel path. |
| 3 | Closing starts a few seconds after the button is held, and stops the moment it is released | LiftMaster E7 describes a delayed held-button override; elapsed time alone does not identify its cause. | Whether anything is broken, which part failed, or whether continued use is safe. | Record a delay already observed; do not reproduce the delayed override. |
| 4 | It needs the button held, and reverses to fully open if released early | Specified Micanan fault-mode behaviour, or a configured E2 roll-back mode, can cause this pattern. | Whether anything is broken, which part failed, or whether continued use is safe. | Identify the installed controller from records and report previously observed release behaviour. |
| 5 | It only responds to constant pressure after moving about a foot | LiftMaster E2 error (two blinks, not E2 wiring mode) reports loss of opening motion feedback. | Whether anything is broken, which part failed, or whether continued use is safe. | Record the two-blink maintenance indication; distinguish it from the E2 mode name. |
| 6 | It ran normally for a few cycles, then dropped to constant pressure | LiftMaster’s invalid-movement report can lead to held-button-only operation. | Whether anything is broken, which part failed, or whether continued use is safe. | Record a flash already observed at movement start; do not run additional cycles to create it. |
| 7 | Constant pressure is needed only when a vehicle is near the door | Manaras D10 indicates an active loop input and the manual describes held-button closing while active. | Whether anything is broken, which part failed, or whether continued use is safe. | Record an already accessible D10 indication and vehicle-presence history. |
| 8 | The remote has stopped working, and the wall button only closes when held | Genie code 62 reports constant-contact configuration disabling radio input. | Whether anything is broken, which part failed, or whether continued use is safe. | Record code 62 and whether the remote previously worked. |
| 9 | No entrapment device has ever been fitted to this door | The installed configuration and learned protection need verification; absent protection is not permission to alter it. | Whether anything is broken, which part failed, or whether continued use is safe. | Use installation/service records to identify protection; a dark LED is not its installation history. |
Sources: DASMA382; LM-L5; MAN-070E; GENIE-TC; MIC-SMART. Row-specific locators and scope are in constant-pressure-cause-tree.csv. Checked 17 September 2026. Source-reported facts are model/document-specific; observations and stop lines are editorial guidance.
These are nine ways to organise the evidence, not nine confirmed causes or a count of fault-free doors. A blocked input can be functioning correctly, while a configured mode can coexist with a separate mechanical problem.
Telling them apart without creating another hazard
Three checks, in this order:
- Use the documented operating mode. Read posted instructions or service records; have a technician identify an internal selector if necessary.
- Record the accessible indication. Include the exact controller and light label. A colour or blink pattern does not mean the same thing on every system.
- Report what already happened when the control was released. Do not run the door to create this observation. Both a configured roll-back mode and a protection restriction can produce reversal.
Genie’s 3A HALT > LOSS OF C/C says the held-contact input was removed before a limit was reached. Genie lists no corrective action for that run code itself. That does not establish that the door’s other components are healthy. ★ Source-reported: Genie, run-code row 3A.
What your operator's control mode means
Commercial operators run in named modes. The mode helps determine whether closing needs a held button and what a timer or stop command does. The protection requirements still depend on the actual equipment and installation.
The same mode name does not guarantee the same behaviour. The checked LiftMaster manual lists seven modes; the checked Manaras and Micanan Smart 10.0 tables list six. Genie uses separate open/close contact settings and timer-module functions. The comparisons below are not certified equivalences or instructions to change a mode.
Scroll horizontally to view all columns.
| Mode | In plain English | Release of CLOSE | Protection scope | LiftMaster Logic 5.0 | Manaras BOARD 070E | Micanan Smart 10.0 | Genie comparison—limited |
|---|---|---|---|---|---|---|---|
| C2 | Tap to open or stop. Hold the button to close. | LiftMaster: the door stops. Manaras: the door stops, and an entrapment device activating reverses it while closing. | Manufacturer/installation-specific; held-button mode does not certify the installation. | Dial C2. | Selector position 0. | C2 stops when CLOSE is released; Smart 10.0 description, not a relay-wiring instruction. | Comparable button-contact pattern: momentary open, held close. Not a verified full mode equivalence. |
| B2 | Tap for open, close and stop. Hands-free closing. | Not applicable - closing is momentary | LM/MIC require documented monitored protection for the named configurations. MAN §1.4 requires entrapment protection but includes non-monitored examples; this is not a universal compliance crosswalk. | Dial B2. Mid stop available. | Selector position 1. | B2; required primary monitored device for momentary closing in this manual. | Momentary/held-contact terminology exists, but this chart does not certify a B2-equivalent installation. |
| D1 | Hold the button to open AND to close. | The door stops. On Manaras an entrapment device activating stops the door rather than reversing it. | Follow the exact manufacturer and installed-system requirements. | Dial D1. | Selector position 2. Safety activation stops closing in this mode. | D1; hold OPEN and CLOSE; releasing either stops movement. | Comparable button-contact pattern: held open and held close. Not a complete mode equivalence. |
| E2 | Tap to open. Hold to close, and letting go sends it back up. | The door reverses to fully open - the roll-back feature | Follow the exact manufacturer and installed-system requirements. | Dial E2; three-button station. | Selector position 3. | E2 includes reversal on release of CLOSE. | No exact E2 roll-back equivalence verified. Code 3A alone does not establish one. |
| T | Tap for open, close and stop, plus a timer that closes the door on its own. | Not applicable | LM/MIC require documented monitored protection for the named configurations. MAN §1.4 requires entrapment protection but includes non-monitored examples; this is not a universal compliance crosswalk. | Dial T; see the manual’s timer conditions. | Selector position 4; safety activation can disable timer closing until fully closed. | T: STOP and safety activation can disable the timer; separate delay-on-close accessory is disabled in T. | TCM is a timer module; code 61 concerns disabled timed closing. No exact T equivalence verified. |
| TS | A timer-closing mode whose restart and STOP behaviour differs by manufacturer. | Not applicable | LM/MIC require documented monitored protection for the named configurations. MAN §1.4 requires entrapment protection but includes non-monitored examples; this is not a universal compliance crosswalk. | Dial TS; STOP does not disable the timer. | Selector position 5; timer refreshes after the specified stop/hoist/power conditions. | TS: STOP disables the timer; safety activation refreshes it. Delay-on-close is an optional apartment-board function. | No exact TS equivalence verified. |
| FSTS | One button opens fully and starts the timer, then the door behaves like TS until it closes. | Not applicable | LiftMaster requires its documented monitored protection for this wiring type. | Dial FSTS. | Not listed in the checked BOARD 070E mode table. | Not listed in the checked Smart 10.0 manual. | No equivalent verified. |
Sources: LM-L5; MAN-070E; MIC-SMART; GENIE-TC. LM pp. 28–29 and 33; MAN §1.4 and p. 16; MIC pp. 17–20; GEN 3A/61/62. Checked 17 September 2026. Source-reported facts are model/document-specific; observations and stop lines are editorial guidance.
Where the documents differ: Manaras §1.4 requires entrapment protection for controls other than held-button closing, but the manual also illustrates non-monitored accessories. That is not permission to ignore an operator’s listing, the installed system’s requirements or local rules. The LiftMaster and specified Micanan configurations here explicitly require their documented monitored protection for momentary closing.
Two things this table makes visible.
First, C2 and E2 behave differently when you let go. In the checked LiftMaster manual, C2 stops when CLOSE is released; E2 returns toward fully open. That is a documented mode difference, not proof that either installation is fault-free.
Second, TS does not treat STOP the same way across manufacturers. LiftMaster’s TS timer is not disabled by STOP. The checked Micanan Smart 10.0 TS instructions say STOP disables the timer; Manaras describes its own timer-refresh conditions. Use the exact manual, not another brand’s mode name. LiftMaster, printed p. 33 · Micanan, printed p. 19 · Manaras, printed p. 16.
How to read your operator's fault codes and status messages
Count the blinks and count the pause — or write down the whole code on the display. Record the model and light label too. Do this only where the indication is safely visible without opening a box. A code may describe a fault, a normal state or a configuration—not a confirmed failed part.
The named platforms report information in different ways. The same brand can have other controllers with different indicators:
Scroll horizontally to view all columns.
| Brand/platform | How it reports | What to record |
|---|---|---|
| LiftMaster Logic 5.0 | Maintenance-light blink pattern; separate radio/status indicators. | Light label, pattern and exact operator. |
| Genie GCL / GCX | Alphanumeric code and display text; separate fire-module trouble messages. | Complete code/text and the controller or module. |
| Manaras BOARD 070E | Paired D2/D3 states and labelled individual LEDs. | Which named LEDs are on, off or flashing together. |
| Micanan Smart 10.0 / specified relay-interface version | Documented control behaviour; Smart 10.0 also has a status-LED table. | Controller type, labelled indication and behaviour already observed. |
Sources: LM-L5; MAN-070E; GENIE-TC; MIC-SMART. Platform-specific diagnostics, not a universal brand chart. Checked 17 September 2026. Source-reported facts are model/document-specific; observations and stop lines are editorial guidance.
LiftMaster Logic 5.0 — blink counts
Scroll horizontally to view all columns.
| Maintenance indication | What the operator reports | Documented effect / limitation | What to report or have assessed |
|---|---|---|---|
| 1 blink | Maintenance interval reached, by cycles or by months | Maintenance indication does not itself inhibit operation; it is not a safety clearance. | Report the maintenance indication and existing service history; do not reset a counter instead of arranging maintenance. |
| 2 blinks | No motion feedback while opening | Door responds to constant pressure only | Report the opening-motion indication. The manual distinguishes feedback, clutch and drive checks; it does not prove the sensor failed. |
| 3 blinks | Maximum run timer expired | Door stops before reaching a limit | Report the point where travel stopped. The cause of a timed-out run needs assessment before settings are changed. |
| 4 blinks | Obstruction sensed, or motion feedback lost while closing | Door reverses to open | Report the closing obstruction/motion indication; do not repeat the reversal as a test. |
| 5 blinks | A button has been held for more than two minutes | That button is ignored | Identify which control was already observed active. Do not force, jumper or bypass it. |
| 6 blinks | Unsupported option card fitted | Option card does not work | Have the installed option card and controller compatibility checked; no live-board access. |
| 7 blinks | Monitored entrapment device faulted or removed for more than two minutes | Manual describes a five-second held-button closing override; this reference does not recommend using it. | Stop relying on the override and report E7 and the protection-device indication. A blockage, removal and defective component are not the same diagnosis. |
| 8 blinks | Brownout detected | Operator runs only while enough power is present | Report the low-voltage indication for qualified supply/control-power assessment. |
| Flash at the start of movement | Motor movement at an invalid time | The manual describes five operations before held-button-only operation; do not run those operations as a test. | Report when the unexpected-motion indication appeared; do not run extra operations to clear it. |
| 10 blinks | Motor phase jumper moved outside programming mode | The phase does not change | Report any recent electrical work. Phase/configuration assessment belongs to qualified personnel. |
Sources: LM-L5. Printed p. 38, E1–E10; T/APT/H/J/HJ/GH/GT Logic 5.0 manual. Separate status and radio indications are in the download. Checked 17 September 2026. Source-reported facts are model/document-specific; observations and stop lines are editorial guidance.
Seven blinks needs its context. E7 includes a faulted device or one removed for more than two minutes. It does not identify the defective part, and a blocked device is not necessarily a broken one.
Genie GCL / GCX — display codes
Genie publishes its codes in one dedicated document covering run codes, error codes, and fire door module trouble codes. A selection of the ones a facility team will actually meet:
Scroll horizontally to view all columns.
| Code / display | What the operator is reporting | What to report or have assessed |
|---|---|---|
| 3A HALT > LOSS OF C/C | Constant-contact input was released before the door reached a limit | Genie assigns no corrective action to this run code itself. Compare the already observed behaviour with the documented mode; do not use it as proof the whole door is healthy. |
| 3B HALT > SHUTDOWN | Hoist interlock or external interlock circuit opened, or the motor overheated | Report the shutdown code and known hoist/interlock condition; overheating is another listed condition, not a confirmed diagnosis. |
| 46 REV > ODC STB | Monitored safety beam or monitored edge activated while closing | Report the active ODC STB input and installed device. Do not realign, disconnect or bypass it from this code alone. |
| 4B REV > MAX RUN TMR | Maximum run time between limits exceeded while closing | Genie begins its technician checks with door balance, then clutch/timer checks. Do not extend run time to mask resistance. |
| 57 STOP > OPEN INTLK | Hoist interlock or external interlock circuit opened | Report the known hoist/interlock condition. Do not bypass the interlock to restore motion. |
| 5A / 5B — WRONG LIMIT / WRONG DIR | Limit or direction input differs from the expected travel state. | Report the individual 5A or 5B message; qualified personnel must assess the limit/direction configuration. |
| 60 CHECK STOP BTN | The normally closed stop circuit is not complete | Report the incomplete stop circuit and any known stop/hoist condition. Do not bridge it. |
| 61 TCM DISABLED | No monitored sensing or safety device is enabled or working | Have the installed monitored protection and timer configuration assessed; do not enable timed closing around a protection fault. |
| 62 NO RADIO >> C/C | The unit is set to constant contact in the open and/or close mode, so radio commands are ignored | Report code 62 and the intended operating arrangement; do not change to momentary operation without assessing protection and the installation. |
| 66 CHECK ODC STB | The ODC STB input on the main board is active; the connected device must be identified | Report code 66 and the actual connected protection device; the active input is not a component diagnosis. |
| 69 OVERHEATED MOTOR | Motor thermal overload is active | Report the thermal-overload message. Genie starts its technician checklist with door balance; the message alone is not an instruction to buy a motor. |
| 8C / 8D SYSTEM VOLTS | Secondary voltage too low, or line voltage too high for the unit's configuration | Record whether the message is 8C or 8D. Supply/configuration testing belongs to qualified electrical personnel. |
Sources: GENIE-TC. Exact code rows listed above; GCL Medium/Standard/Heavy Duty and GCX document; this is a curated selection, not the complete chart. Checked 17 September 2026. Source-reported facts are model/document-specific; observations and stop lines are editorial guidance.
Code 62 deserves a moment. On the named Genie platforms, constant contact in the open and/or close setting disables radio input. That can explain the radio symptom without proving a failed receiver. Changing the setting still requires checking the intended operation and protection—not calling it a free fix.
Manaras-Opera BOARD 070E — LED combinations
The BOARD 070E uses D2 and D3 together to show status, with other labelled LEDs for individual inputs. Record the combination, not just ‘a red light’. Don't open the enclosure to retrieve it.
Scroll horizontally to view all columns.
| D2 (green) | D3 (red) | What it means |
|---|---|---|
| Off | Off | DC power failure |
| On | Off | Standby status; not a safety clearance |
| Flashing | Off | Door opening |
| Off | Flashing | Door closing |
| On | Flashing | Wrong handing — a limit was not released within 3.6 seconds of starting travel. External commands are ignored |
| On | On | Faulty motor centrifugal switch (single phase only) |
| Flashing | Flashing | Timer to close counting down, or a programming sequence in progress |
Individual LEDs worth knowing: D6 on indicates the reversing/sensing-edge input; the operating mode determines the response. D9 off points to the stop circuit or hoist/disconnect condition, not a uniquely identified failed part. D10 on indicates an active inductive-loop input; Manaras describes held-button closing while it is active.
Sources: MAN-070E. BOOK1120 REV 8, 2026/07/16; printed pp. 14–16, Tables 1–2 and operating modes. Checked 17 September 2026. Source-reported facts are model/document-specific; observations and stop lines are editorial guidance.
The 3.6-second wrong-handing condition is a reason to report the code and the recent work, not to diagnose swapped wires from the symptom. Direction, limits and electrical connections require qualified assessment. Do not swap supply leads or motor wires from a troubleshooting article.
Micanan — behaviour plus controller identification
The August 2010 PRO-J/PRO-H manual describes both a relay-logic interface module and Smart 10.0. In its specified momentary-close arrangements, a missing or non-working primary monitored device produces held-button closing; releasing early sends the door back toward fully open.
That behaviour is not a diagnosis by itself. The same manual’s E2 operating mode also reverses when CLOSE is released. Smart 10.0 has labelled status LEDs as well, so “Micanan has no codes or indicators” is not a reliable rule.
Sources: MIC-SMART. Manufacturer-authored manual hosted by ismartgate; printed pp. 14, 16, 18 and 22. This legacy manual does not establish behaviour for every current Micanan/Nice operator. Checked 17 September 2026. Source-reported facts are model/document-specific; observations and stop lines are editorial guidance.
The pattern across all four
Here's something you only see when you put four manufacturers side by side.
● Calculated: ten codes in the checked Genie GCL/GCX document start their corrective-action list with a door-balance check — 39, 49, 4B, 51, 52, 59, 5C, 5D, 5E and 69. We counted those ten individual code identifiers, not the grouped CSV rows. Codes 39, 49 and 59 are limited to trolley models. Source: Genie’s code document, those exact rows, checked 17 September 2026.
Read that again. The operator's own electronics, reporting its own faults, keep pointing back at the mechanical door. The ten entries make door balance a first check for the technician. They do not all prescribe the same later checks, and they do not establish how often a mechanical fault is the cause.
A code is evidence, not a parts order. The useful conclusion is to assess the door and operator together, not to assume that electronics are usually innocent.
What you can safely check
Five checks. None of them needs an open control box or contact with anything under tension. Skip any observation that would put you in the opening or near a damaged assembly.
1. Secure the bay first. Cone it. Stop traffic. Follow the site’s procedure for taking the affected opening out of use. Smoke, fire or sparking belongs under the site emergency response, not a reset attempt.
2. Record what the operator is saying. Blink count and pause length. The full text on a display. Which accessible indicator lights are lit. Video the pattern from a safe position before it is cleared. An internal display, selector or counter can be read by authorised personnel later; leave it unknown rather than opening the enclosure.
3. Look toward the beam path, not through the opening. From a safe position, note visible pallets, bins, carts, cardboard, snow or ice. Do not walk under a suspect raised door to inspect or clean a sensor. Removing an obstruction does not by itself verify that the rest of the system is safe.
4. Check what kind of sensor is installed. A vehicle detector and the primary entrapment-protection device are not necessarily the same thing. Record labels or dimensions only where safely accessible; do not reposition anything.
★ Source-reported: for photoelectric sensors used as external monitored entrapment protection, DASMA #382 states that the beam must be parallel to the floor and no more than six inches above it. The lowest beam of a monitored light curtain follows that height limit. Extra vehicle-protection devices do not replace the primary monitored device. DASMA #382, pp. 1–2, Rev 05/22/22.
★ Source-reported: Manaras BOOK1120 REV 8, §1.4, specifies photo cells facing each other within six inches (15 cm) of the door’s plane, with the beam no more than 5-3/4 inches (14.6 cm) above the floor. These are the manual’s stated dimensions, not a new universal height rule. Manaras, printed p. 6.
A high-mounted device alone does not prove noncompliance: it may be additional vehicle protection. The question is whether the correctly specified primary protection is present and functioning. Have the installation checked against its own instructions and applicable requirements.
5. Note visible locks and hoist status. A lock or hoist interlock can affect operation on the named platforms. Record what is already visible; do not disengage a suspect door, alter a switch or bypass an interlock. LiftMaster troubleshooting, printed pp. 36–37 · Manaras, Table 1 D9 · Genie code 57.
The monthly test is separate from first-response troubleshooting
DASMA #382 calls for monthly photoelectric-sensor testing and tells facilities to review the operator manufacturer’s instructions. The expected results are:
- Interrupting the specified beam during closing produces the specified reversal.
- An obstructed beam prevents an open door from beginning its normal close cycle.
That is a description of the checks, not an instruction to run a damaged door. Designated personnel should use the exact manufacturer procedure on equipment suitable for testing, with the area controlled. Never use a person or body part as the obstruction. A sensing edge has its own manufacturer test; it is not tested by applying the photoeye procedure.
A failed protection test needs assessment before normal use resumes. Do not assume monitoring will always prevent movement under every control mode.
Sources: DASMA #382, “Testing”; DASMA #269, sensing-edge inspection; Manaras safety instructions, printed p. 11. Test boundaries above are editorial guidance.
Where you have to stop
Stop when the next step involves stored energy, electrical access, a suspect moving assembly or fire protection. The symptom count does not define who is qualified to perform a particular job.
That is not caution for its own sake. It's where stored energy, uncontrolled movement, electrical hazards and fire protection require equipment-specific procedures.
The hands-off list
Scroll horizontally to view all columns.
| Hands-off boundary | Why |
|---|---|
| Torsion/extension springs, winding cones and spring-tension hardware | Stored energy; adjustment belongs to trained personnel using the exact procedure. |
| Lifting cables, drums and bottom brackets | High tension and door-support hazards; do not loosen or adjust them. |
| A crooked, derailed or jammed door | The assembly may move or fall unexpectedly; do not try to seat it by running it. |
| A door that drifts or fails to hold its intended position | Keep clear of possible uncontrolled descent; do not repeat a holding test. |
| An electrical enclosure or internal wiring | Qualified personnel and appropriate electrical safe-work procedures are required. |
| A protection device or interlock you would bypass to restore movement | Bypassing changes protection; it does not repair the underlying cause. |
| Fire-door release, reset, adjustment or test hardware | Use trained fire-door personnel and the applicable procedure; see fire doors. |
Sources: CLOPAY; OSHA147; OSHA333; DASMA299. Manufacturer high-tension warning; applicable servicing/electrical rules; fire-door training guidance. Checked 17 September 2026. Source-reported facts are model/document-specific; observations and stop lines are editorial guidance.
What the rules actually say
Several rules and instructions can apply; a single symptom does not establish a violation. The OSHA provisions below concern covered federal general-industry work. State-plan requirements, adopted building/fire codes and the installed equipment’s instructions must also be checked where they apply.
1. Electrical equipment must meet the applicable approval rules. Under 29 CFR 1910.303(a), equipment must be approved as defined in 1910.399. The “acceptable” definition includes a recognised testing-laboratory route and limited alternatives for equipment no such laboratory accepts and for custom-made equipment. That is more precise than saying every operator must simply be “listed.” Listed or labelled equipment must also be used in accordance with its listing/labelling instructions under 1910.303(b)(2). OSHA 1910.303 · OSHA 1910.399, “Acceptable” and “Approved”.
DASMA #358 discusses UL 325 in that operator-approval context. It is industry guidance, not a substitute for the OSHA text, a product’s actual listing or a jurisdiction’s adopted requirements. DASMA #358, Rev 10/15.
2. Covered servicing means controlling hazardous energy. 29 CFR 1910.147(a)(1)(i) covers servicing and maintenance where unexpected energization, start-up or release of stored energy could injure someone. A door system can present those hazards. This is not a claim that every visual observation requires the same lockout procedure.
3. And here is the one that catches people. ★ Source-reported: Under 29 CFR 1910.147(b), an energy isolating device is a mechanical device that physically prevents the transmission or release of energy — a circuit breaker, a disconnect switch, a line valve, a block. The definition then says plainly: push buttons, selector switches and other control circuit type devices are not energy isolating devices.
Pressing STOP is not lockout. Neither is hitting the wall station. Neither is an interlock.
★ Source-reported: 29 CFR 1910.333(b)(2)(ii)(B) makes the same point for electrical work: circuits and equipment to be worked on shall be disconnected from all electric energy sources, control circuit devices such as push buttons, selector switches and interlocks may not be used as the sole means for deenergizing, and interlocks for electric equipment may not be used as a substitute for lockout and tagging procedures.
Sources: 29 CFR 1910.147(a)(1)(i), (b) and (d)(5); 29 CFR 1910.333(b)(2)(ii)(B). Federal rule text checked at OSHA, 17 September 2026.
4. Fire doors have their own rulebook. DASMA #299 explains periodic inspection and technician requirements in NFPA 80-2022. Which edition and provisions govern a particular installation depends on the applicable adoption and requirements. See fire doors.
None of that turns into a step-by-step lockout procedure on this page, and it shouldn't. Follow the employer’s applicable energy-control and electrical safe-work procedures; do not improvise them from an article. Observation is limited to a safe position. Servicing is a different activity with different requirements.
If you're working out what a repair company would actually handle, our commercial overhead door repair page describes that scope.
Five symptoms that do not prove the motor is failing
These symptoms can involve settings, inputs or the mechanical door—not just the motor. They still need the right evidence before anyone changes a setting or buys a part.
1. Stops most of the way, and a second press finishes it. A maximum-run-timer event is one possibility. The checked manuals give a 90-second default for LiftMaster Logic 5.0 and Manaras BOARD 070E. Their learned allowances differ: travel time plus 10 seconds for LiftMaster and full-closed-to-full-open time plus five seconds for Manaras. Those are manufacturer-stated settings, not recommended adjustments. A timed-out run does not by itself tell you why travel took too long. ★ Source-reported: LiftMaster, printed p. 34; Manaras, printed p. 17.
2. Opens to the same height every time. A programmed intermediate stop is possible. Compare the position with operating records; do not assume a new short-travel problem was deliberately programmed. Genie code 3E · Micanan, printed p. 20.
3. Closes on its own. A timer can produce intended automatic closing. Unexplained movement still needs assessment; do not run the door to watch which internal light comes on. LiftMaster timer modes · Manaras modes, printed p. 16.
4. Only constant pressure works after moving about a foot. The checked LiftMaster manual documents this with missing opening motion feedback. Two maintenance-light blinks identify the corresponding error; they do not prove the sensor itself failed. LiftMaster, printed pp. 37–38, E2 error. This error identifier is different from the E2 operating mode.
5. Wall station dead, but the buttons on the board work. Use that information only if it was already established by qualified personnel. A stop/control-circuit problem is one documented possibility; do not open the enclosure to try it. Genie’s 60 CHECK STOP BTN means the stop circuit is incomplete. Genie code 60.
What to write down before you call
Eight items. Record what is safely available; leave the rest unknown for the technician. Do not operate a faulty door or open a box to complete the list.
- Door type — sectional, rolling steel, grille, or fire door
- Operator brand and model from the nameplate
- Documented mode, from posted instructions or existing records; internal settings can be recorded by authorised personnel
- Blink count and pause length, or the full code on the display
- Which safely visible indicator lights are lit, including their labels
- An existing cycle-counter reading, including its date and what equipment it counts
- Exactly what the door did in each direction — separately, up and down, without running another test
- What changed just before it started — an impact, a power event, an electrical repair, a cold snap
Say what the door did. Don't guess the failed part. For example: “Bay 4 stopped about six inches off the floor and went back up; the display read 66.” That is a sample fault report, not a diagnosis or a Uptime service record.
For the rest of what a service company needs — access, hours, approval limits, who signs — see what to tell a repair company when you call.
What a cycle-counter reading can—and cannot—tell you
A counter belongs to the operator or control board, not automatically to the springs now on the door. Internal retrieval belongs with authorised personnel following the manual; do not turn selectors or press board buttons to obtain it.
LiftMaster Logic 5.0: the “Life of Operator” display uses one OPEN-light flash per 5,000 cycles and one CLOSE-light flash per three months. There is no indication before the corresponding threshold is reached. It is a stepped readout, not an exact current-spring cycle count. ★ Source-reported: LiftMaster, printed p. 35, Life of Operator Feature.
Manaras BOARD 070E: the manual describes an internal non-resettable counter. Orange flashes represent 100,000-cycle units, red 10,000-cycle units and green 1,000-cycle units. The display does not show the final three digits: the manual explicitly gives 205,000 and 205,999 cycles as producing the same display. ★ Source-reported: Manaras, printed p. 18, Built-in Cycle Counter.
And the definition that makes the number mean something: ★ Source-reported: DASMA defines a cycle as fully closed, to fully open, and back to fully closed. DASMA #160, “Cycle” · DASMA #277, “Cycle”. Check the controller’s counting convention and service history before comparing its reading with a component rating.
A counter cannot tell you when the present springs were fitted, whether the operator or board was replaced, or how many recorded movements those springs experienced. Use it with the maintenance records—not as proof that a spring has exceeded its design life.
Say the right word
The clearest example of why names matter: “the rubber strip at the bottom” might refer to an astragal—a seal—or a sensing edge—a safety device. Name the function as well as what it looks like.
Scroll horizontally to view all columns.
| What people say | What the trade calls it | Why it matters | Starred fire term in DASMA #277? |
|---|---|---|---|
| The rubber strip at the bottom | Astragal | It is a seal. It is not the same component as a sensing edge. | No |
| The rubber strip that stops the door | Sensing edge | It is a safety device, not weatherstripping. | No |
| The electric eyes | Photoelectric sensor | Names the sensor type; replacement compatibility still depends on the installed system. | No |
| The big roll at the top | Barrel assembly | A shaft/barrel assembly that supports the curtain and may contain the counterbalance; its name does not diagnose a spring fault. | No |
| The side channels | Guides | Sectional doors have tracks. Rolling doors have guides. | No |
| The rails | Track | Vertical, horizontal, high lift and low headroom all need different parts | No |
| The little clips on the slat ends | Endlocks | Endlocks restrain sideways slat movement; the complete curtain still needs inspection. | No |
| The wheel on the side | Tension wheel, also charge wheel or adjusting wheel | Under spring load. Adjustment requires trained, authorised personnel and the equipment-specific procedure. | No |
| The chain that unhooks the operator | Disconnect chain | Lets the hand chain work the door in a power failure | No |
| The thing that stops it dropping if a spring goes | Inertia brake, also safety stop bearing or stop lock bearing | A device intended to stop free fall; an engaged brake needs equipment-specific assessment, not an improvised reset. | No |
| The bar across the door | Strut | Stiffens the door section; a wind rating belongs to the specified complete door assembly, not the word strut alone. | No |
| The corner bracket at the bottom | Bottom bracket | Connected to lifting hardware under high spring tension. Do not loosen or adjust it. | No |
| It will not stay up | Dead in the head | The trade term for no counterbalance at the open position | No |
| The little door in the big door | Pass door, also wicket door | A pedestrian door within the larger door; an associated interlock can affect operation. This label does not establish exit-code compliance. | No |
| The small metal link on a chain with a weight | Fusible link | A heat-responsive link associated with release hardware. Confirm the door from labels and records rather than from the link alone. | YES |
| The weight that drops the door | Dropout | Disengages the gearing or operator so the door can close in a fire | YES |
| The thing that slows the door as it drops | Governor | Controls descent speed; DASMA #277 does not mark Governor with its fire-only asterisk. | No |
| The flap inside the hood | Flame baffle | Closes the gap between curtain and hood when released | YES |
Sources: DASMA277; DASMA160; DASMA382. Named entries. Fire-term flag records DASMA’s terminology convention; it does not identify or rate an installed door. Checked 17 September 2026. Source-reported facts are model/document-specific; observations and stop lines are editorial guidance.
● Calculated: five of the 41 entries in the full crosswalk carry the fire-term flag. Governor is not starred in DASMA #277 and is not included in that count. The counted entries are Fusible Link, Dropout, Flame Baffle, the automatic-closing/release-device entry, and Drop Test. The download contains the full 41-row table.
Fire doors: why this page stops
Identify fire doors from labels and equipment records, not a one-part shortcut. Suspected release hardware is a reason to stop ordinary troubleshooting and have the assembly identified. Do not open a hood to look for it. DASMA #277 terminology · DASMA #267 fire-door labels.
A dropped fire door is not automatically a broken door—or proof it worked correctly. Closure can follow a release signal, but the cause still matters. The right first question is not “how do I reset it.” It is “did the alarm system activate, and does anyone know why.” Follow the site’s alarm response before treating it as a maintenance issue.
Testing and reset need the applicable fire-door procedure and trained personnel. DASMA #299 explains periodic inspection/testing and training provisions in NFPA 80-2022, citing §5.2.4.2 and the trained-technician definition in §3.3.131. It also discusses annual inspection/testing language for the 2024 International Fire Code. These are identified editions, not a claim that the newest code automatically governs every building. Have the responsible authority or fire-protection professional confirm the adopted requirements for the installation. DASMA #299, 4/13/23.
A fire-door trouble message needs its exact meaning. Genie’s Fire Door Module code 15 means a test of the door and operator is required. Other messages concern battery, notification or alarm circuits. “Test required” does not prove the assembly is fault-free. Record the code. Don’t clear it, and don’t run the test yourself. ★ Source-reported: Genie code document, Fire Door Module table, p. 10.
DASMA #252 explains why the starting position for a rolling-fire-door test matters for certain designs; it is not a general reset recipe. Use the manufacturer’s procedure with trained fire-door personnel. DASMA #252, Rev 8/24.
How we checked this
We read the source documents. Not other articles about them. On 17 September 2026 we checked the relevant primary-source text listed in Sources, recorded visible revision information and assembled the table set. A source without a stated publication date is labelled that way; the verification date is not its edition date.
What we did:
- Named every document with its revision code and access date. The cited DASMA sheets show revision information; the Manaras manual shows a book number, revision and date. Those are recorded rather than paraphrased.
- Used manufacturer-authored documents, DASMA technical sheets, Clopay guidance and OSHA rule text. The LiftMaster and Micanan PDFs are copies of manufacturer documents hosted by third parties; that hosting is disclosed in the source register. We did not treat a distributor’s article as a manufacturer specification.
- Kept manufacturer specifications labelled as manufacturer-stated, for the named model and manual revision only. A blink code from a LiftMaster Logic 5.0 is a fact about that control platform, not about commercial doors in general.
- Paraphrased every description rather than reproducing any manufacturer's chart whole. Where a code's meaning is the whole point, we've said what it means in our own words and pointed at the source document.
- Computed the row counts and flagged-term count with the supplied script. The ten-code Genie count uses the explicit list of verified individual code identifiers, not a search for words in grouped rows.
- Marked our own editorial judgments as ours. Symptom groupings, safe observations, stop lines and cross-brand comparisons are editorial synthesis. We did not rank causes by likelihood.
What we did not do: test any door, inspect any installation, or claim any credential. Uptime Dock & Door is a commercial service-referral business. Its research section publishes source-based reference material. We are not a manufacturer, a laboratory, a standards body, or a repair crew, and nothing here should be read as an inspection or an engineering opinion.
The two evidence marks: ★ Source-reported means we checked it in the cited primary document. ● Calculated means we counted or computed it from verified inputs with the method shown. Neither label means that a claim is awaiting verification. Editorial guidance is identified separately.
What this does not cover
Stated plainly, because you'll need to know before you rely on any of it.
Selected operator platforms, not all of them. The message table represents four brands, not every controller sold under those names. Some rows group multiple codes; normal statuses and one behaviour entry are included. Sixty-three rows does not mean 63 distinct fault codes.
Mode names are not interchangeable. Even shared names can behave differently, as the TS/STOP comparison shows. The Genie column is a limited terminology comparison, not a verified one-to-one mode crosswalk.
This is not failure-frequency data. The symptom table organises documented possibilities and useful observations. Its row order and the number of times a topic appears do not measure prevalence, risk or repair cost.
Manufacturer specs are manufacturer-stated. They apply to the named model, configuration and manual revision. They are not independent testing and not a universal rating.
Legacy documentation stays legacy documentation. The Micanan comparison uses the August 2010 PRO-J/PRO-H manual, with its controller types separated. It is not a claim about every current product. The LiftMaster manual is likewise limited to the listed Logic 5.0 models.
Fire doors are outside the scope of ordinary troubleshooting. This page explains identification clues and handoff boundaries. It is not a fire-door identification certificate, inspection guide or test procedure.
Codes are not automatic parts orders. Some messages name a circuit or component—the Manaras centrifugal-switch indication is one example. Even then, the installed equipment, actual condition and manufacturer’s diagnostic procedure matter. Treat a code as evidence, not a complete repair decision.
None of this replaces your door's manual, your operator's manual, your facility's energy control procedure, or your authority having jurisdiction—the body responsible for the applicable local requirements.
Sources
Every source key used in the tables above resolves here. Relevant primary-source text checked 17 September 2026.
Scroll horizontally to view all columns.
| Key | Publisher | Document | Edition / revision | Link |
|---|---|---|---|---|
| DASMA382 | DASMA | TDS #382 Proper Installation of Photoelectric Non-Contact Sensors on Vehicular Commercial Door Operators | REV 05/22/22 (orig 6/26/17) | Source |
| DASMA375 | DASMA | TDS #375 Motor Operated Commercial Sectional Doors and Rolling Doors: Typical Installation Concerns | 2/8/06 Rev 12-13 Reaff 3-17 | Source |
| DASMA277 | DASMA | TDS #277 Rolling Door Terminology | 9/3/03 Rev 6/20 | Source |
| DASMA358 | DASMA | TDS #358 Vehicular Commercial Door and Gate Operators, and OSHA Requirements | 12/20/02 Rev 1/14 Rev 10/15 | Source |
| DASMA160 | DASMA | TDS #160 Sectional Garage Door Terminology | Rev 8/17 Reaff 6/18 Rev 1/19 | Source |
| DASMA1501 | DASMA | TDS #1501 Standard Lift Garage Doors with Jackshaft Operation | 12/08/22 | Source |
| LM-L5 | LiftMaster (Chamberlain Group) | Logic 5.0 Installation Manual — T, APT, H, J, HJ, GH, GT | 45-page manufacturer manual; date not stated in inspected text | Source |
| MAN-070E | Manaras-Opera | Installation & Instruction Manual, Electronic Control BOARD 070E | BOOK1120 REV 8, 2026/07/16 | Source |
| GENIE-TC | The Genie Company | Commercial Operator Troubleshooting Codes — GCL Medium, Standard, Heavy Duty and GCX | 10-page document; publication date not stated; file metadata identifies v2 | Source |
| MIC-SMART | Micanan Systems | PRO-J / PRO-H Installation and Instruction Manual — Smart 10.0 and relay logic with interface module | August 2010 | Source |
| OSHA147 | US OSHA | 29 CFR 1910.147 — Control of hazardous energy | Federal rule text checked 2026-09-17 | Source |
| OSHA333 | US OSHA | 29 CFR 1910.333 — Selection and use of work practices | Federal rule text checked 2026-09-17 | Source |
| OSHA399 | US OSHA | 29 CFR 1910.399 — Definitions applicable to electrical rules | Federal rule text checked 2026-09-17 | Source |
| OSHA303 | US OSHA | 29 CFR 1910.303 — General electrical requirements | Federal rule text checked 2026-09-17 | Source |
| DASMA269 | DASMA | TDS #269 Rolling Door and Rolling Fire Door Visual Inspection | Rev 2/21; issued 3/15/21 | Source |
| DASMA176 | DASMA | TDS #176 Adding Weight to a Sectional Garage Door | 1/30/06; Rev 8/08; reaffirmed 6/19 | Source |
| DASMA299 | DASMA | TDS #299 Rolling Steel Fire Door Periodic Inspection and Technician Training Requirements | 4/13/23; discusses NFPA 80-2022 | Source |
| DASMA252 | DASMA | TDS #252 Test Rolling Fire Doors in the Fully Open Position ONLY | Rev 8/24 | Source |
| DASMA267 | DASMA | TDS #267 Rolling Door Product Safety Label Recommendations | Rev 1/24 | Source |
| CLOPAY | Clopay | Commercial Door Maintenance | Undated web page; checked 2026-09-17 | Source |
Source register checked 17 September 2026. Exact entries, pages or clauses and verification dates accompany the downloadable records.
The LiftMaster PDF is a manufacturer-authored copy hosted by Devanco. The Micanan PDF is a manufacturer-authored copy hosted by ismartgate. Genie’s linked asset is reached through its commercial-document library. DASMA’s UL/NFPA explanations are technical guidance, not copies of the complete standards.
Download the data
The Commercial Door Fault Ledger v2.0.0 — 158 technical reference records across five tables, plus a 20-row source register: 178 rows in all. Compiled 17 September 2026. These are reference entries, not an incident sample or failure-rate dataset. Every technical record includes source URLs, a locator, scope and verification date.
Scroll horizontally to view all columns.
| File | Contents |
|---|---|
symptom-ledger.csv | 38 rows — symptoms, documented context, safe observations, limits of inference, stop lines and exact sources |
operator-mode-crosswalk.csv | 7 rows — platform-specific modes, differences and limits of equivalence |
operator-fault-codes.csv | 63 rows — selected codes, statuses and behaviour from four brands; grouped entries are identified |
constant-pressure-cause-tree.csv | 9 rows — held-button observations and what they do and do not establish |
name-crosswalk.csv | 41 rows — plain speech, trade terms, definitions and DASMA fire-term flags |
sources.csv | 20 rows — publisher, document, edition, URL, verification date and sections used |
commercial-door-fault-ledger.json | The five reference tables and source register, with matching metadata and calculated counts |
data-dictionary.md | Every field, evidence category, missing-value rule and model-scope limitation |
build_ledger.py | Rebuilds all six CSVs, JSON, dictionary and fault card from its embedded verified records; validates counts |
commercial-door-bay-fault-card.txt | Printable bay fault card — record what is safely known; do not submit personal details |
Provenance: the 20-source register. Counts are calculated from the supplied files by build_ledger.py; the source register is counted separately from technical records.
On reuse: no licence is asserted. The source documents remain subject to their publishers’ rights. This compilation does not grant permission to reproduce those documents, diagrams or standards. No third-party manual is bundled in the download.
How to cite this
Uptime Dock & Door Research. The Commercial Door Fault Ledger, version 2.0.0. Compiled 17 September 2026; source text checked 17 September 2026. In Commercial garage door troubleshooting: 38 symptoms, four brands of operator messages, and where you have to stop. Canonical article.
For a specific record, include its symptom ID, mode, code or trade term and the underlying source. The compilation’s counts are not manufacturers’ failure statistics.
For recurring observations before a symptom appears, use the commercial garage door maintenance checklist.
Questions people ask
Is it safe to keep using a door that only closes on constant pressure? Held-button closing may be the documented operating mode. It does not certify the door is safe. A new change needs assessment; do not assume a failed photoeye or use a protection override as a continuing workaround. DASMA #382 · LiftMaster E7.
Can I just disconnect the photo eyes so the door closes normally again? No. Do not bypass or remove required protection. The named manuals describe restrictions when monitored protection is missing or faulted, but the response depends on the platform and configuration. An override or mode change is not a repair. LiftMaster E7 · Genie code 61.
How do I know if my door is a fire door? Start with safely accessible labels and equipment records. A fusible link or release assembly is a clue, not a complete identification; a governor is not marked as a fire-only term by DASMA. Do not open a hood or reset hardware to find out. See the fire door section and DASMA #277.
Why does my door reverse only in the afternoon? The time pattern alone does not identify a cause. Note the time, lighting, weather and accessible sensor indication, and report whether the behaviour is new. Do not reposition the sensors on that evidence alone. Use the installed sensor’s manual to interpret its indication; the time pattern is not a reason to adjust it.
The operator is fine, but the dock leveler in the same bay is acting up too. Related? Do not assume they are related or independent. Record each symptom and have the installed controls and any interlocks identified. The equipment needs its own procedure. Our reference on dock leveler types and common failures covers that separate equipment category.
Does a fault code tell me what part to buy? Not by itself. Some messages name components, but that is not the same as a completed diagnosis of your installation. Record the exact controller and code, then use the manufacturer’s diagnostic process through qualified personnel. That is why the ledger has a “what this does not establish” column. Manaras, Table 2 · Genie’s code document.
Uptime Dock & Door Research is the research and reference section of uptimedockanddoor.com. Uptime Dock & Door is an independent commercial service-referral publisher. It is not a manufacturer, a laboratory, a standards body, or a repair contractor. See our editorial policy and About page. See contact information for the publisher’s current contact arrangements.