Question about liftmaster Chamberlain Garage Door Opener Transmitter 300MC
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Posted on Jan 02, 2017
there is a 2amp fuse inside the opener. go get one and replace it. please look at what kind of fuse it is it's the one that has glass all around and about 1 inch long. to replace this unplug the unit then take the 4 screws out take cover off and you will see the fuse inside
Posted on Jun 20, 2009
The shaft on these garage door motors are not direct drive systems. You'll have to open up the box to see what the actual problem is. I have had stuff like this happen where a gear just slipped out of place.
Here is a link for a parts supplier. I don't know your model but it looks like most of the Liftmaster worm screw gears and drive gears are plastic so it's possible that one of them has cracked.
Posted on Feb 14, 2010
YOU COULD TRY
RECONNECT THE RPM SENSOR, UNPLUG THE UNIT. TURN THE MOTOR BY HAND (DOWN DIRRECTION) TO CLEAR THE LIMIT SWITCH.
PLUG THE UNIT IN IF. IT STILL OVERSHOOTS THE LIMIT IT COULD BE A BAD LIMIT SWITCH. IF THE SWITCH TESTS GOOD FOR CONTINUITY REPLACE THE BOARD.
HOPE THIS HELPS
Posted on Jun 05, 2010
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