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error Chamberlain
Error Code 1 UP / 1 DOWN
The garage door opener will not close and the lightbulbs flash. Safety sensors are not installed, connected, or wires may be cut.
? What Causes This
Safety sensors are not installed, connected, or wires may be cut.
✓ How to Fix It
- Inspect sensor wires for a disconnected or cut wire.
- Verify all connections are secure.
- Replace any damaged wiring.
Source: page 37 of the official manual
From the manual
This error code appears in:
Chamberlain Chamberlain Garage Door Opener