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

1 Answer

Door opener looses power

The opener will operate correctly sometimes. Then it will quit in the middle of opening or closing: I hear a click and the lights go out. I have a lamp plugged into the same outlet and it stays lit, so I know there is power to the unit. When the unit is stopped on it's own I can tap on the back (near the logic board) and it will come back on. I removed the logic board and reinstalled it and it still does the samething. Then it stops on it's own I can hear the unit hum. After about 20 seconds the unit clicks back on, the humming stops and the light goes back on again. The unit will work sometimes for a day sometimes it quits again after a few tries. Sounds like a bad connection, but where? perhaps the sealed micro switch just above the transformer?

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  • szaryfamily Oct 04, 2009

    A thermal cutoff on the motor was a thought I discounted because I could "tap" the logic board and the unit would come back on. Can a vibration reset a thermal cutoff?

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  • Master
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Motor has a thermal sensor if it gets too hot it trips the sensor till it cools down. Motor may be going bad, or door may have gottin to heavy ( spring loose tension over time) disconnect door from operator. You should be able to raise it easily manually.

Posted on Oct 04, 2009

  • gripfitter
    gripfitter Oct 04, 2009

    No. thermal over load is heat only and will only return the connection when the motor cools. With a good magnifier check the logic board for cracks. Pay particular attention to the traces on the underside of the board.

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