Greetings, have an R170 that when activated keeps driving the door down and won't stop until it's unplugged. Swapped lower limit switch, capacitor and logic board, all to no avail. Any thoughts?
I doubt it would be the motor. It definitely sounds like a bad down limit switch. I would try another one. Did you buy a new limit switch or did you have a used one? We've had openers where we replaced the switch and found that the one we used to replace the switch was also bad and had to try a 3rd one.
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