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ErrBase

Liftmaster Garagedoor Error Codes

All Liftmaster garagedoor error codes with step-by-step troubleshooting, multimeter specs, and OEM part numbers.

11 error codes

CodeMeaning
1-2The motor's built-in thermal protector has tripped due to excessive heat from overuse or from working too hard against a binding door.
highbeginner
1-4The logic board (main control board) inside the motor unit has experienced an internal failure and needs to be replaced.
highadvanced
1-5A remote control button or keypad key is stuck in the pressed position, or a button was held down too long during a programming attempt.
lowbeginner
1-6The trolley (carriage) has been disconnected from the drive system, or the opener is in a factory default state after a hard reset.
moderatebeginner
10 FlashesLock Mode is active on the opener. All remote controls and keypads are disabled. Only the wall-mounted door control button works.
lowbeginner
4-1The sensor wires are reversed at the logic board terminals, or there is an open circuit (broken wire) somewhere in the sensor wiring.
highintermediate
4-2The safety photo eye sensors at the bottom of the door tracks are not properly aligned or something is obstructing the beam between them.
highbeginner
4-3The door failed to reverse when it should have during a safety reversal test, or the sensitivity is set too high and the reversal force is insufficient.
highintermediate
4-4An obstruction is blocking the sensor beam path, or the sensor lens is dirty enough to prevent the beam from reaching the receiver.
moderatebeginner
4-6The door has traveled to its limit but the opener cannot confirm it reached the open or close position, or travel limits need to be set or reset.
highintermediate
HUBHub page covering all LiftMaster garage door opener LED blink fault codes.
lowbeginner