Blinking lights on your LiftMaster garage door opener indicate different issues depending on which lights blink and pattern, with motor unit LED and safety sensor LEDs providing diagnostic codes. On motor unit, Learn LED blinking indicates programming mode or error, steady for 30 seconds indicates program mode active, rapid blinking may indicate error. Safety sensor LEDs at bottom of door tracks, sending sensor should have steady yellow or green light, receiving sensor should have steady green light, if blinking, sensors misaligned, blocked, or wiring issue. If sending sensor blinks, check wiring. If receiving sensor blinks, sensors misaligned, clean lenses and align until steady. Wall control LED blinking may indicate vacation lock activated or wiring issue. Opener lights on motor unit flashing after door reverses indicate safety sensors blocked or door hit obstruction, check sensors and door path. Diagnostic codes, number of blinks on motor unit LED indicates specific error, for example 1 blink means safety sensors wire open, 2 blinks means sensors shorted, 4 blinks means sensors misaligned, 5 blinks means motor overheated. Count blinks and check manual for code meaning. MyQ LED blinking indicates WiFi connection issue. Consult LiftMaster manual for your model for exact blink code definitions.
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