LiftMaster / Chamberlain / Craftsman · Garage Door Opener error code

Battery LED solid red + beep every 30 sBackup battery worn out

Cross-checked Power off, standard tools

Unlock what this code means, its causes, tests and parts

Full library + AI assistant for $34.90, one time.

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 beeping (battery backup)

Beeps come from the battery backup: running on battery, low battery or a worn-out battery. Replace the 12 V battery when the LED is solid red.

3 steps ~20 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

Garage opener light stays on, or will not light

A light that stays on is usually a feature (light button, motion detection, safety-light on beam break) or a door control/wiring fault; Chamberlain gives a test that separates the door control from the logic board. A dead light is usually the bulb, its type, or the socket.

4 steps ~30 mineasy