Place a box or similar object between the safety sensors to block the sensing beam.
How to replace rpm sensor garage door.
The door should stay open and the motor unit lights should blink.
This basic procedure works for common craftsman liftmaster and chamberlain garage door openers.
Replace the rpm sensor with the manufacturer approved replacement part.
After investigation it seem that the sensor was broken because the red lights were blinking without stopping even though nothing was in the path for it to close.
If your chain drive garage door opener s led light flashes 5 times and the door moves just a few inches at a time the rpm sensor might be the problem.
Open the garage door.
The repair guide and video show how to replace a garage door opener rpm sensor in 6 steps.
We tried re aligning it but to no avail.
Attempt to close the garage door using a remote.
How to replace a chain drive garage door opener rpm sensor liftmaster rpm sensor you replacing the rpm sensor on a garage door opener you how to replace a chain drive garage door opener rpm sensor.
If the rpm sensor breaks the garage door only moves 6 to 8 inches at a time and the led light flashes 5 times.
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The rpm sensor detects motor speed.
If the garage door opener closes the door with the safety sensors blocked replace the logic board.