Merlin
Merlin Garage Door Openers Error Codes
Complete list of fault codes and troubleshooting guides. Use the search below to find your specific error.
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1
Opener will not run from remote or wall button, courtesy light flashes once, 7-segment display shows code 1.
Photo Safety Beam Obstruction or Misalignment
10
The display shows code 10; the opener does not respond to remote or wall button commands.
Control Board Fault or Firmware Error
11
The display shows code 11; the opener runs but stops randomly, sometimes reversing without obstruction.
Travel Sensor / Encoder Error
12
The display shows code 12; the wall button works but remotes do not, even after battery replacement.
Radio Receiver Fault
13
The display shows code 13; the wall button is unresponsive but remotes still operate the door.
Wall Control Circuit Fault
14
The display shows code 14; the opener will not run, the courtesy light may flash, and beeping may be heard.
Safety Input or External Device Fault
15
The display shows code 15; the opener operates but the light does not turn on or off correctly.
Courtesy Light Circuit Fault
16
The display shows code 16; the opener will not move, and a faint clicking sound may be heard from inside the unit.
Low Voltage or Power Supply Fault
17
Display shows code 17, opener stops and reverses a short distance after starting.
Soft Start/Stop or Current Sense Fault
18
Display shows code 18, battery backup LED flashing (on models with backup), opener may not run on battery.
Battery Backup Fault
19
Display shows code 19, opener beeps continuously until reset.
Service Reminder or Maintenance Alert
2
Door will not close from remote, opener clicks but reverses to open, courtesy light flashes twice, display shows code 2.
Safety Beam Circuit Open or Short
3
Door starts to move then stops and reverses, opener beeps and flashes three times, display shows code 3.
Excessive Force Detected – Down Travel
4
Door stops and reverses when opening, opener flashes four times, display shows code 4.
Excessive Force Detected – Up Travel
5
Opener runs briefly then stops, motor hums or stalls, display shows code 5.
Motor Overload or Stalled Motor
6
Opener does not respond, display shows code 6 or flashes six times after a failed cycle.
Limit Position Not Learned or Lost
7
Opener beeps and flashes seven times, the door will not move, and the display shows code 7.
Door Locked or Mechanical Obstruction
8
The opener runs but the door does not move; the display shows code 8 or flashes eight times.
Drive Disengaged or Trolley Not Connected
9
The opener beeps and flashes nine times; the door stops mid-travel and reverses or will not move.
Over-Temperature or Duty Cycle Exceeded
Symptom
Courtesy light stays on continuously and does not turn off after the usual timeout.
Stuck Light Relay or Misconfigured Light Timer
Symptom
Door closes then immediately opens a short distance (bounces back) without any beeping or flashing.
Down Force Too High or Floor Obstruction
Symptom
Door is very noisy when opening or closing, with grinding or rattling sounds from the opener rail.
Drive Chain/Belt and Rail Wear
Symptom
Door is very noisy, with squeaking and banging from the door itself rather than the opener.
Door Hardware Wear (Rollers, Hinges, Springs)
Symptom
Door opens by itself randomly without anyone pressing a remote or wall button.
Unintended Activation / Interference
Symptom
Door opens normally but will not close using the remote; it will close only when holding the wall button down.
Safety Beam Bypass Mode (Constant Pressure Close)
Symptom
Door opens or closes part way then stops and can be moved again only after a short wait.
Thermal Overload or Motor Overheating (No Code)
Symptom
Door reverses to fully open when trying to close, no error code shown, safety beam LEDs appear normal.
Down Travel Limit Set Too Short
Symptom
Door starts to close, then stops and opens when the sun is shining directly on one of the sensors.
Sunlight Interference with Safety Beams
Symptom
Door stops slightly open and will not close fully, leaving a small gap at the floor.
Door Binding at Bottom or Limit Slightly Misadjusted
Symptom
Door will not open fully; it stops short of the usual open position without any error code.
Up Travel Limit Misadjusted or Obstruction at Header
Symptom
Door will not open or close from any remote, but wall button works normally.
Remote Transmitter Failure or Not Programmed
Symptom
Door will not stay closed; it drifts open a small amount after closing, even with opener disengaged.
Door Out of Balance – Spring Tension Incorrect
Symptom
Door will not stay open; it slowly closes when stopped mid-travel with opener disengaged.
Door Out of Balance – Weak Springs
Symptom
Keypad outside the garage does not operate the door, but remotes and wall button work.
Wireless Keypad Fault or Programming Issue
Symptom
Opener hums but the door does not move; after a few seconds the motor stops.
Failed Motor Start Capacitor or Seized Motor
Symptom
Opener lights and display are on, but pressing the wall button or remote does nothing; no motor noise.
Lock Function Enabled or Vacation Mode
Symptom
Opener vibrates excessively and the rail shakes when operating, causing noise in the house.
Improper Opener Mounting or Loose Brackets
Symptom
Water or condensation is visible inside the opener housing, and operation is intermittent.
Moisture Ingress / Environmental Damage
| Error Code | Symptom | Fault Type | Guide |
|---|---|---|---|
| 1 |
Opener will not run from remote or wall button, courtesy light flashes once, 7-segment display shows code 1.
|
Photo Safety Beam Obstruction or Misalignment | View Details |
| 10 |
The display shows code 10; the opener does not respond to remote or wall button commands.
|
Control Board Fault or Firmware Error | View Details |
| 11 |
The display shows code 11; the opener runs but stops randomly, sometimes reversing without obstruction.
|
Travel Sensor / Encoder Error | View Details |
| 12 |
The display shows code 12; the wall button works but remotes do not, even after battery replacement.
|
Radio Receiver Fault | View Details |
| 13 |
The display shows code 13; the wall button is unresponsive but remotes still operate the door.
|
Wall Control Circuit Fault | View Details |
| 14 |
The display shows code 14; the opener will not run, the courtesy light may flash, and beeping may be heard.
|
Safety Input or External Device Fault | View Details |
| 15 |
The display shows code 15; the opener operates but the light does not turn on or off correctly.
|
Courtesy Light Circuit Fault | View Details |
| 16 |
The display shows code 16; the opener will not move, and a faint clicking sound may be heard from inside the unit.
|
Low Voltage or Power Supply Fault | View Details |
| 17 |
Display shows code 17, opener stops and reverses a short distance after starting.
|
Soft Start/Stop or Current Sense Fault | View Details |
| 18 |
Display shows code 18, battery backup LED flashing (on models with backup), opener may not run on battery.
|
Battery Backup Fault | View Details |
| 19 |
Display shows code 19, opener beeps continuously until reset.
|
Service Reminder or Maintenance Alert | View Details |
| 2 |
Door will not close from remote, opener clicks but reverses to open, courtesy light flashes twice, display shows code 2.
|
Safety Beam Circuit Open or Short | View Details |
| 3 |
Door starts to move then stops and reverses, opener beeps and flashes three times, display shows code 3.
|
Excessive Force Detected – Down Travel | View Details |
| 4 |
Door stops and reverses when opening, opener flashes four times, display shows code 4.
|
Excessive Force Detected – Up Travel | View Details |
| 5 |
Opener runs briefly then stops, motor hums or stalls, display shows code 5.
|
Motor Overload or Stalled Motor | View Details |
| 6 |
Opener does not respond, display shows code 6 or flashes six times after a failed cycle.
|
Limit Position Not Learned or Lost | View Details |
| 7 |
Opener beeps and flashes seven times, the door will not move, and the display shows code 7.
|
Door Locked or Mechanical Obstruction | View Details |
| 8 |
The opener runs but the door does not move; the display shows code 8 or flashes eight times.
|
Drive Disengaged or Trolley Not Connected | View Details |
| 9 |
The opener beeps and flashes nine times; the door stops mid-travel and reverses or will not move.
|
Over-Temperature or Duty Cycle Exceeded | View Details |
| – |
Courtesy light stays on continuously and does not turn off after the usual timeout.
|
Stuck Light Relay or Misconfigured Light Timer | View Details |
| – |
Door closes then immediately opens a short distance (bounces back) without any beeping or flashing.
|
Down Force Too High or Floor Obstruction | View Details |
| – |
Door is very noisy when opening or closing, with grinding or rattling sounds from the opener rail.
|
Drive Chain/Belt and Rail Wear | View Details |
| – |
Door is very noisy, with squeaking and banging from the door itself rather than the opener.
|
Door Hardware Wear (Rollers, Hinges, Springs) | View Details |
| – |
Door opens by itself randomly without anyone pressing a remote or wall button.
|
Unintended Activation / Interference | View Details |
| – |
Door opens normally but will not close using the remote; it will close only when holding the wall button down.
|
Safety Beam Bypass Mode (Constant Pressure Close) | View Details |
| – |
Door opens or closes part way then stops and can be moved again only after a short wait.
|
Thermal Overload or Motor Overheating (No Code) | View Details |
| – |
Door reverses to fully open when trying to close, no error code shown, safety beam LEDs appear normal.
|
Down Travel Limit Set Too Short | View Details |
| – |
Door starts to close, then stops and opens when the sun is shining directly on one of the sensors.
|
Sunlight Interference with Safety Beams | View Details |
| – |
Door stops slightly open and will not close fully, leaving a small gap at the floor.
|
Door Binding at Bottom or Limit Slightly Misadjusted | View Details |
| – |
Door will not open fully; it stops short of the usual open position without any error code.
|
Up Travel Limit Misadjusted or Obstruction at Header | View Details |
| – |
Door will not open or close from any remote, but wall button works normally.
|
Remote Transmitter Failure or Not Programmed | View Details |
| – |
Door will not stay closed; it drifts open a small amount after closing, even with opener disengaged.
|
Door Out of Balance – Spring Tension Incorrect | View Details |
| – |
Door will not stay open; it slowly closes when stopped mid-travel with opener disengaged.
|
Door Out of Balance – Weak Springs | View Details |
| – |
Keypad outside the garage does not operate the door, but remotes and wall button work.
|
Wireless Keypad Fault or Programming Issue | View Details |
| – |
Opener hums but the door does not move; after a few seconds the motor stops.
|
Failed Motor Start Capacitor or Seized Motor | View Details |
| – |
Opener lights and display are on, but pressing the wall button or remote does nothing; no motor noise.
|
Lock Function Enabled or Vacation Mode | View Details |
| – |
Opener vibrates excessively and the rail shakes when operating, causing noise in the house.
|
Improper Opener Mounting or Loose Brackets | View Details |
| – |
Water or condensation is visible inside the opener housing, and operation is intermittent.
|
Moisture Ingress / Environmental Damage | View Details |
No matching codes found
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