Garage Door Opener: Won't open
If your garage door won't open when you click the remote or press the button on the wall control, first make sure the garage door isn't locked. If the door isn't locked, pull the emergency release cord to check whether the door opens smoothly; fix the door tracks if the door binds when opening. If the door opens smoothly, you may need to adjust the up-force setting.
Activate the garage door opener with the emergency release still pulled to see if the trolley moves. If the trolley doesn't move when the motor runs, you may need to replace the gear and sprocket assembly or the drive and worm gears. A broken chain or belt can also prevent the trolley from moving. Use the tips in our video to troubleshoot the garage door opener if the motor runs but the trolley doesn't move.
If the door only moves a few inches and stops, the RPM sensor could be bad. If the motor doesn't run at all, you may need to replace the garage door opener logic board. Although rare, a failed drive motor is another reason why the door won't open. If the motor buzzes and doesn't move an unobstructed and disconnected trolley, replace the drive motor.
Replace the garage door opener gear and sprocket assembly
As the drive shaft and sprocket rotate, they drive the trolley that lifts and lowers the garage door. The plastic gear on the drive shaft is designed to fail if the garage door gets stuck in the travel tracks, protecting the expensive drive motor from damage. If the gear is worn or damaged, the door won't move properly. Replace the gear shaft and sprocket assembly if it's damaged or worn out.
Replace the garage door opener drive and worm gears
The worm gear attaches to the motor shaft and rotates the drive gear to spin the sprocket which drives the chain to move the door. Made of plastic, the worm and drive gears strip out to protect the motor from damage if the door suddenly hits an object in its travel path. Replace the drive and worm gears if they're worn or stripped.
Replace the garage door opener RPM sensor
The RPM sensor monitors motor shaft rotation and sends speed signals to the logic board. The logic board shuts off the motor and flashes the learn light 5 times when it doesn't receive speed signals from the RPM sensor. The door only moves 6 to 8 inches and then stops when the logic board isn't receiving speed signals. Replace the RPM sensor if the door only moves a short distance and the learn light flashes 5 times.
Replace the garage door opener chain and cable assembly
The sprocket on the motor unit drives the chain and cable assembly. The cable is attached to the trolley that lifts and lowers the garage door. If the chain or the cable is damaged, replace it.
Replace the garage door opener belt
The motor pulley drives the belt to move the trolley along the rail to lift and lower the garage door. If the belt frays or breaks, replace it.
Replace the garage door opener AC motor
The AC motor drives the gears that rotate the sprocket which moves the chain to raise and lower the door. Replace the motor if it doesn't run when you activate the garage door opener.
Replace the garage door opener DC motor
The DC motor rotates the pulley which drives the belt to move the door. Replace the motor if it doesn't run when you activate the garage door opener.
Replace the garage door opener logic board
The logic board receives input signals from remotes, sensors and the wall control. It controls the electro-mechanical functions of the garage door opener. Replace the logic board if it doesn't receive input signals or doesn't control components properly.
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