Question about Exercise & Fitness
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Posted on Jan 02, 2017
The thing to do is remove the cover and watch the limit switch assembly. You should be able to see how it is supposed to work and determine what is wrong. A small gear on the end of the shaft turns the limit switch assembly to make contact and turn off the motor in each direction. Something may be broken or out of place. There is also a possibility your logic board is bad especially if you have had electrical storms recently.
Posted on Jul 06, 2009
Sounds like you have a bad RPM sensor board. This is a small printed circuit board just in front of the motor. It's job is to reverse the door when it hits an obstacle but will act as you describe when they go bad. The part number is 41C4398A and is available at Sears or any good door service company.
Posted on Dec 20, 2010
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