Question about liftmaster Chamberlain Garage Door Opener Transmitter 300MC
I hava a Lift master 1/2 hoursepower opner. After changing out the main drive gear the door will close but goes back up upon touching the ground. How do I fix this?
ADJUST THE CLOSE LIMIT SWITCH UNTIL THE DOOR CLOSE SOFTLY, UN CAN DECREASE IT BY TURNING THE FLAT SCREW COUNTERCLOCKWISE.... VERIFY THAT BOTH LEDS OF THE PHOTOCELLS ARE ONE.. OTHERWISE U GONNA HAVE TO ALIGN THEN OR REPLACE IT!
Posted on Mar 09, 2009
Try adjusting the close shut off switch.(limiting switch) It sounds like when the door shuts, it has too much pressure. The sensor picks this up and reverses the door.This is a saftey feature. It just needs adjusting
Posted on Mar 07, 2009
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Posted on Jan 02, 2017
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