Question about liftmaster Chamberlain Garage Door Opener Transmitter 300MC
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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Posted on Jan 02, 2017
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