The main drive gear is the plastic gear that comes in direct contact with the worm drive gear on the motor.
Garage door opener motor locked.
That should stop your wall switch from flashing.
If you find that it keeps running this can present a problem in your system.
Broken garage door torsion or extension springs.
These things can leave you at the mercy of a lo.
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Garage door opener won t open all the way fix.
If your garage door opener is locked check the wall control it may be set to vacation mode.
Garage door locked from the outside.
Ask a question door closes and then opens and stays open why when i press the garage door opener the motor runs but the door won t when i open my automatic garage opener it goes up about 8 inches then see more questions answers featured garage doors openers.
Once you have re set the lock switch rather than depressing it again and having it lock on you simply press the learn button on the back of the motor unit and then don t touch anything for 1 minute.
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Replace the main gear drive if the garage door opener makes a grinding noise but the door doesn t move your main drive gear is probably toast.
If the garage door is not opening but the motor is running the problem might rest on the springs in your garage door assembly.
This video will show you how for most garage door openers including liftmaster chamberlain sears.
In a typical situation the motor for your garage door opener should stop running once the door has closed.