Mighty Mule
Mighty Mule 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 FLASH
Operator will not run from remote or wall station; control board LED blinks 1 time repeatedly.
Photo Eye Obstruction or Misalignment
10 FLASH
Opener runs briefly then stops; control board LED blinks 10 times repeatedly.
Stall Detection or Excessive Current Draw
11 FLASH
Opener lights turn on but motor does not run; control board LED blinks 11 times repeatedly.
Motor Start Circuit Failure
12 FLASH
Wireless keypad and remotes intermittently fail; control board LED blinks 12 times intermittently.
RF Memory or Code Storage Error
2 FLASH
Garage door opener will not move; control board LED blinks 2 times repeatedly.
Wall Console Lockout or Shorted Wall Control Circuit
3 FLASH
Opener will not run; control board LED blinks 3 times repeatedly.
Force or Travel Limit Error
4 FLASH
Opener attempts to run but stops immediately; control board LED blinks 4 times repeatedly.
Motor Overload or Thermal Trip
5 FLASH
Opener does not respond to remote; control board LED blinks 5 times repeatedly.
Radio Receiver or Antenna Fault
6 FLASH
Door reverses to open position immediately after starting to close; control board LED blinks 6 times repeatedly.
Safety Reversal System Activation
7 FLASH
Opener lights flash and unit will not run; control board LED blinks 7 times repeatedly.
Logic Board Power or Low-Voltage Short
8 FLASH
Door stops mid-travel and will not complete open or close cycle; control board LED blinks 8 times repeatedly.
Travel Calibration or Encoder Fault
9 FLASH
Opener will not start; control board LED blinks 9 times repeatedly.
Overvoltage or Undervoltage Protection
NO LED / NO RESPONSE
Mighty Mule garage door opener is completely dead: no lights, no sounds, no LED indicators.
No Power to Opener
Symptom
Burning smell or visible smoke from opener during or after operation.
Electrical Overheating or Component Failure
Symptom
Door moves a few inches then stops; must be pressed multiple times to fully open or close.
Intermittent Stall or Over-Sensitive Force Setting
Symptom
Door opens by itself randomly without any user input.
Unintended Activation / RF Interference
Symptom
Door opens normally but will not close from remote or wall button; lights flash repeatedly.
Obstructed or Faulty Safety Sensors
Symptom
Door reverses fully open after hitting the floor instead of staying closed.
Down Travel Overrun or Excessive Close Force Reversal
Symptom
Door slams shut quickly when disconnected from opener or is very heavy to lift.
Improper Door Spring Balance (Not Opener Fault)
Symptom
Door starts to close then reverses when about halfway down, with no visible obstruction.
Mid-Travel Binding or Track Obstruction
Symptom
Door will not close from remote; will only close if wall button is held down continuously.
Safety Sensor Bypass Mode (Constant-Pressure Close)
Symptom
Door will not fully open; stops short of the usual open position.
Insufficient Up Travel or Obstruction at Header
Symptom
High-pitched squealing or grinding noise from opener head during operation.
Dry Bearings or Worn Internal Gears
Symptom
Loud banging or jerking during door movement when operated by the opener.
Mechanical Binding or Loose Hardware
Symptom
Opener beeps or clicks but motor does not start; occurs mainly in cold weather.
Cold-Related Capacitor or Lubrication Issue
Symptom
Opener light does not turn on when door operates, but opener otherwise works normally.
Light Circuit or Lamp Socket Failure
Symptom
Opener motor runs but chain/belt does not move; grinding or humming noise from head unit.
Stripped Drive Gear or Sprocket Failure
Symptom
Opener motor runs but the door does not move; chain or belt moves but trolley stays in place.
Trolley Disengaged or Broken Trolley Assembly
Symptom
Opener operates normally but door does not lock securely when closed; can be lifted easily by hand.
Improper Door Arm Position or Backdrive
Symptom
Opener runs but door only moves a few inches and then reverses direction.
Incorrectly Set Travel Limits After Installation
Symptom
Remote controls have very short range or only work when very close to the opener.
Weak RF Signal or Antenna Issue
Symptom
Wall console works intermittently or only when pressed very hard.
Failing Wall Console or Poor Low-Voltage Connection
Symptom
Water or condensation visible inside opener housing; intermittent operation during damp weather.
Moisture Intrusion Affecting Electronics
Symptom
Wireless keypad does not operate the door but remotes work normally.
Keypad Programming or Power Issue
| Error Code | Symptom | Fault Type | Guide |
|---|---|---|---|
| 1 FLASH |
Operator will not run from remote or wall station; control board LED blinks 1 time repeatedly.
|
Photo Eye Obstruction or Misalignment | View Details |
| 10 FLASH |
Opener runs briefly then stops; control board LED blinks 10 times repeatedly.
|
Stall Detection or Excessive Current Draw | View Details |
| 11 FLASH |
Opener lights turn on but motor does not run; control board LED blinks 11 times repeatedly.
|
Motor Start Circuit Failure | View Details |
| 12 FLASH |
Wireless keypad and remotes intermittently fail; control board LED blinks 12 times intermittently.
|
RF Memory or Code Storage Error | View Details |
| 2 FLASH |
Garage door opener will not move; control board LED blinks 2 times repeatedly.
|
Wall Console Lockout or Shorted Wall Control Circuit | View Details |
| 3 FLASH |
Opener will not run; control board LED blinks 3 times repeatedly.
|
Force or Travel Limit Error | View Details |
| 4 FLASH |
Opener attempts to run but stops immediately; control board LED blinks 4 times repeatedly.
|
Motor Overload or Thermal Trip | View Details |
| 5 FLASH |
Opener does not respond to remote; control board LED blinks 5 times repeatedly.
|
Radio Receiver or Antenna Fault | View Details |
| 6 FLASH |
Door reverses to open position immediately after starting to close; control board LED blinks 6 times repeatedly.
|
Safety Reversal System Activation | View Details |
| 7 FLASH |
Opener lights flash and unit will not run; control board LED blinks 7 times repeatedly.
|
Logic Board Power or Low-Voltage Short | View Details |
| 8 FLASH |
Door stops mid-travel and will not complete open or close cycle; control board LED blinks 8 times repeatedly.
|
Travel Calibration or Encoder Fault | View Details |
| 9 FLASH |
Opener will not start; control board LED blinks 9 times repeatedly.
|
Overvoltage or Undervoltage Protection | View Details |
| NO LED / NO RESPONSE |
Mighty Mule garage door opener is completely dead: no lights, no sounds, no LED indicators.
|
No Power to Opener | View Details |
| – |
Burning smell or visible smoke from opener during or after operation.
|
Electrical Overheating or Component Failure | View Details |
| – |
Door moves a few inches then stops; must be pressed multiple times to fully open or close.
|
Intermittent Stall or Over-Sensitive Force Setting | View Details |
| – |
Door opens by itself randomly without any user input.
|
Unintended Activation / RF Interference | View Details |
| – |
Door opens normally but will not close from remote or wall button; lights flash repeatedly.
|
Obstructed or Faulty Safety Sensors | View Details |
| – |
Door reverses fully open after hitting the floor instead of staying closed.
|
Down Travel Overrun or Excessive Close Force Reversal | View Details |
| – |
Door slams shut quickly when disconnected from opener or is very heavy to lift.
|
Improper Door Spring Balance (Not Opener Fault) | View Details |
| – |
Door starts to close then reverses when about halfway down, with no visible obstruction.
|
Mid-Travel Binding or Track Obstruction | View Details |
| – |
Door will not close from remote; will only close if wall button is held down continuously.
|
Safety Sensor Bypass Mode (Constant-Pressure Close) | View Details |
| – |
Door will not fully open; stops short of the usual open position.
|
Insufficient Up Travel or Obstruction at Header | View Details |
| – |
High-pitched squealing or grinding noise from opener head during operation.
|
Dry Bearings or Worn Internal Gears | View Details |
| – |
Loud banging or jerking during door movement when operated by the opener.
|
Mechanical Binding or Loose Hardware | View Details |
| – |
Opener beeps or clicks but motor does not start; occurs mainly in cold weather.
|
Cold-Related Capacitor or Lubrication Issue | View Details |
| – |
Opener light does not turn on when door operates, but opener otherwise works normally.
|
Light Circuit or Lamp Socket Failure | View Details |
| – |
Opener motor runs but chain/belt does not move; grinding or humming noise from head unit.
|
Stripped Drive Gear or Sprocket Failure | View Details |
| – |
Opener motor runs but the door does not move; chain or belt moves but trolley stays in place.
|
Trolley Disengaged or Broken Trolley Assembly | View Details |
| – |
Opener operates normally but door does not lock securely when closed; can be lifted easily by hand.
|
Improper Door Arm Position or Backdrive | View Details |
| – |
Opener runs but door only moves a few inches and then reverses direction.
|
Incorrectly Set Travel Limits After Installation | View Details |
| – |
Remote controls have very short range or only work when very close to the opener.
|
Weak RF Signal or Antenna Issue | View Details |
| – |
Wall console works intermittently or only when pressed very hard.
|
Failing Wall Console or Poor Low-Voltage Connection | View Details |
| – |
Water or condensation visible inside opener housing; intermittent operation during damp weather.
|
Moisture Intrusion Affecting Electronics | View Details |
| – |
Wireless keypad does not operate the door but remotes work normally.
|
Keypad Programming or Power Issue | View Details |
No matching codes found
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