# Chamberlain code 1-2: the door won’t close because a sensor wire is shorted

Source page: https://garagedoorscience.com/code/chamberlain-error-codes/1-2

## The door won’t close because a sensor wire is shorted

Somewhere along the sensor wiring, two wires touch or are connected the wrong way round. A staple pinching the wire is a common cause.

**Check this first, then a pro.** Check the sensor wire wherever it is stapled or joined. Replace a damaged piece of wire, or have a pro do it.

From the maker’s manual:
- Chamberlain manual for model B980, PDF page 40: https://cgi.widen.net/content/vlzppckqt9/original/114a5126.pdf
- Chamberlain manual for models B4603T, B4643T, B4613T, B6713T, B6753T, PDF page 43: https://cgi.widen.net/content/zwq7paf7l4/original/114-5739-000.pdf

Garage Door Science isn’t affiliated with the opener makers LiftMaster, Chamberlain or Genie. Each meaning is our summary of the maker’s own manual, which we link.