Overhead Door · Garage Door Opener error code

Long LED red flashing, round LED offDoor contact or door component problem

Single source High-voltage / caution

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OnCall Tech is a reference tool for trained technicians and can make mistakes. Always disconnect power and confirm with the manufacturer's documentation before you work.

Related diagnostic guides

Guide · Garage Door Opener

Opener runs or hums but the door does not move

Separate a disconnected trolley, a stripped gear/sprocket, a jammed trolley or a door problem (lock, broken spring). Door-side spring problems go to a door technician.

5 steps ~60 minmoderate

Guide · Garage Door Opener

Garage door won't move with the opener after the red release cord was pulled

The emergency release disconnects the door arm from the trolley. Re-engaging it is usually a matter of setting the release back to its connected position and running the opener so the trolley catches the carriage. First confirm the door is balanced; a heavy door means a spring problem, which is blocked work.

4 steps ~15 mineasy