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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.

10 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
1-5A 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. It tells the radio receiver to ignore every wireless signal it gets, so all your remotes and keypads are completely blocked. Only the hardwired wall-mounted door control still works.
lowbeginner
4-1The sensor wires are either reversed at the logic board terminals or there's an open circuit somewhere in the run. No signal is completing the loop back to the motor unit.
highintermediate
4-2The two infrared photo eyes at the bottom of your garage door tracks aren't talking to each other. One shoots a beam across to the other, and when that beam gets interrupted or the sensors aren't aimed right, the opener locks out the close function entirely.
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
HUBThis hub covers all LiftMaster LED blink fault codes. When the opener can't complete an operation, the firmware logs a fault and flashes the motor unit's Up and Down arrow LEDs in a two-digit pattern. Up arrow blinks first, pause, then Down arrow blinks. Match both counts to find your specific code.
lowbeginner