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

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I have a Craftsman 139.53673SRT garage door opener. When I try to close door with remote or single push on doorbell control, the door reverses after 6-8 inches of travel - and big bulb flashes 10 times. I can close door by holding down on doorbell until door is all the way down. Door opens normally with remote or single push on the doorbell. Could this still be an RPM sensor problem?? Al

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When the main light flashes 10 times and the door reverses it is a door sensor problem. Make sure they are pointed at one another and that the small light on each one is lit and not flickering. Tweak them a bit. If you cannot get both lights to come on you have a bad sensor or wiring.

Posted on Aug 28, 2010

  • mulemanboss Aug 28, 2010

    Don - Thanks for your prompt response - should have mentioned that I do not have the infra red sensors on my door - only the pressure sensitive sensor which, I guess, is built into the circuit of the system. Do I need a new logic board?

    Al

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What does the purple button light flashing on 1/2 horsepower craftsman garage door opener


I think the adjustment mode is on.

For example, that's from Craftsman manual:

""
Setting the Force
The force setting button is located on the left panel of the motor unit. The force setting measures the amount of force required to open and close the door.
1. Locate the purple button on the left panel of the motor unit (Figure 1).
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""

Actually, you should just read carefully your garage door opener unit's manual.

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Craftsman LiftMaster Chamberlain Garage Door Opener Wireless Keypad Model 976LM Security+: My craftsman 1/2 hp garage dood does not close whe...


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