Because we live in a free country the government says garage door openers manufactured after 1993 have to have an inferred safety reversal system (UL325).
You need to adjust the receiving sensor until you have a steady green light, then the garage door opener will function properly again.
SOURCE: liftmaster garage door opener will only work at wall unit
check electric saftey beams. shovel blocking them. dirty. aligned (LED on in each unit)
SOURCE: garage door wont close every time
you have problem with sensors. does each have an led lit. if not, align them better, should solve problem.
SOURCE: Garage door won't shut, light blinks 10 times.
If the light blinks 10 times it is a sensor problem. Nothing else will cause this. Tweak the sensor a bit and check it out.
SOURCE: Door won't close, blinks 10 times, sensor light yellow
Anytime the main light flashes 10 times and the door reverses to the open position it is a door sensor problem or the wiring to them. Nothing else causes this symptom.
SOURCE: My liftmaster will not operate and my led light bl...
That code is RPM sensor or motor overload. When the RPM sensor goes bad the motor will still run for a short time. If the motor has been run several cycles it will turn off on the thermal overload and won't reset for about 15 minutes. The resetting is automatic. Is your door stuck in the open position?
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