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error Chamberlain
Error Code 1 UP / 2 DOWN
The garage door opener will not close and the lightbulbs flash. There is a short or reversed wire for the safety sensors.
? What Causes This
There is a short or reversed wire for the safety sensors.
✓ How to Fix It
- Inspect safety sensor wire at all staple and connection points.
- Replace wire or correct connections as needed.
Source: page 37 of the official manual
From the manual
This error code appears in:
Chamberlain Chamberlain Garage Door Opener