Overhead Door · Garage Door Opener error code

Round LED blue or purple flashingRemote not programmed

Single source Power off, standard tools

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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

Garage door reverses or will not close (safety sensors)

Nearly always the photo-eye safety sensors: blocked, misaligned, sun-blinded or miswired. Sensors must be repaired, never bypassed. If sensors are fine, look at force/limits and door binding.

5 steps ~30 mineasy

Guide · Garage Door Opener

Remote or keypad will not operate the opener

Check lock/vacation mode first, then the remote battery, then reprogram using the Learn/SET button. Short range is often radio interference from nearby LED bulbs.

4 steps ~20 mineasy

Guide · Garage Door Opener

Wall button not working (or door opens by itself)

A shorted or reversed wall-control wire is the usual cause, often from a staple. Phantom operation is commonly a shorted wall button or a stuck remote.

3 steps ~30 mineasy