As with many such problems the most common problem is the simplest one the motor unit has been unplugged.
Garage door opener motor keeps running.
If your opener seems to overrun the switch and just keeps trying to pull the garage door up or down after it reaches the end of travel you might assume that it missed the switch or was moving too fast.
For safety reasons trained professionals only should make limit and force adjustments to your garage door opener.
There s something wrong with the garage door opener that s stopping it from opening the door for you.
Motor will not stop running.
Garage door opener motor running constantly.
About a week ago the motor started running constantly even when the door was not in use.
The motor continues to run after the garage door is closed.
It s also possible that the circuit breaker fuse or gfci outlet powering the door opener circuit has tripped or burned.
Is 062200 and the unit was installed about 20 years ago.
Check the manual to see if there are additional troubleshooting steps to take.
Garage door openers or their remotes can develop problems that don t seem to make sense.
Set the step ladder under the garage door opener in your garage and use it to access the up and down limit switch adjustment screws located on the side of the garage door opener motor housing.
In most cases the cause will be a stripped gear or a chain that has come off the sprocket.
If you find that it keeps running this can present a problem in your system.
I have attached the link below.
When you open your garage door and the motor won t stop running there might be a problem with the limit switch.
While you are waiting on an expert to answer your question a suggestion i have is to set service with a sears technician so they can fix this problem.
The limit switch is the one that controls the travel of the door.
If this is the case the motor will run but as the chain isn t where it should be it can t generate the lift to open the door.
It tells the motor that lowers and lifts the door when to stop running.
I have a b d controll a door 4 cad 4 opener for a tilt garage door.
Finally it s possible the garage door opener s motor.