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error Chamberlain
Error Code 4 UP / 6 DOWN
The garage door opener will not close and the lightbulbs flash. Safety sensors are misaligned or were momentarily obstructed.
? What Causes This
Safety sensors are misaligned or were momentarily obstructed.
✓ How to Fix It
- Realign both sensors to ensure both LEDs are steady and not flickering.
- Make sure nothing is hanging or mounted on the door that would interrupt the sensor's path while closing.
Source: page 38 of the official manual
From the manual
This error code appears in:
Chamberlain Chamberlain Garage Door Opener