Question about Sears Craftsman LiftMaster Chamberlain Garage Door Opener Wireless Keypad Model 976LM Security+

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Chamberlain access master chain drive garage door opener

My garage door opener motor will not stop going down even when limit switch contacts touch. It stops when opening fine but not when going down. We recently had a neighbors house struck by lightning and I assume we had a power surge since this has been occuring since then. Do you think replacing the limit switch will correct this problem or could it be a larger problem. Motor, safety sensors and all other components seem to be fine. Thank you.

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First unplug the unit for about 5 min. to reset the circuit board. while you are waiting use an ohm heter or multi tester to see is the limit switch works.

If the switch tests good and resetting doesn't help you probably need a new board.

Be sure to also get a suge protector to help save the system in the future.

Hope this helps

Posted on May 29, 2010

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