Why does my Digidor2 garage door motor occasionally stops working and then starts again after 20 or 30 minutes? What is the cause and can it be rectified to restart sooner? Is there a re-set button?

Manually re set your door by puling the rope to unlatch from chain-motor and restart sometimes that works -if not unplug unit for 2 minutes then replug and try again

Most garage openers are designed to open and close the door occasionally, not to run the motor continuously.

There likely is an overheat sensor that shuts power off if the motor gets too hot.

The relay contacts are worn. Replace the relay first. If the condition is the same , look at the motor's safety overload device.

I think you need to remove the cover from the motor unit and take a look at the limit switch assembly.

Most common cause of the problem you describe is a bad start capacitor. Remove the cover from the motor unit. The capacitor is about 5 inches long and 2 inches in diameter.

Sounds like a bad start capacitor. Remove the cover from the motor unit and the capacitor is about 5 inches long and 2 inches in diameter.

Check the door springs and also remove the cover from the motor unit and check the drive gear. The door spring could be broken or the drive gear may be stripped.

The sensors only work when the door is closing.

Usually when this happens it is because the door is open and the trolley is jammed against the bolt just in front of the motor unit. Try loosening the chain to relieve the pressure on the trolley and then close the door. While the door is closed locate the 'up limit' control on the side of the motor unit and turn this control 2 full turns in the opposite direction of the arrow printed on the cover. Now tighten the chain.

Remove the cover of the motor unit and check the drive gear. It is a white nylon gear just in front of the motor. It is most likely stripped.

I just had the same problem. Extreme cold, garage door stops working, motor hums, same here. I opened up the my garage door opener(after unplugging it), and found that the wormwheel had a wear spot on it. This is the gear that allows the motor to raise and lower the garage door. Any way, after the wife "sugested" that the door was too heavy to lift, I went and bought a new garage door lifter. But if you are handy dandy with tools, I have seen the wormwheel for sale here. http://www.aaaremotes.com/gearsprocask.html It's the plastic wheel that went bad on me. If I would have found this before buying the garage door opener, I would have got the sprocket assembly. I hope this helps!