Chamberlain code 1-2
The door won’t close because a sensor wire is shorted
Check this first, then a proSomewhere along the sensor wiring, two wires touch or are connected the wrong way round. A staple pinching the wire is a common cause.
What to do: 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 manuals:
- Chamberlain manual, PDF page 40 for B980
- Chamberlain manual, PDF page 43 for the B4603T and 4 more models
Which models each manual covers
- Chamberlain manual for model B980
- Chamberlain manual for models B4603T, B4643T, B4613T, B6713T, B6753T
Not this one? Look up another Chamberlain code
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.
Find a local pro in your area
Broken spring, door off the track, anything urgent? Enter your ZIP and we’ll hand you off to the installer we’d call ourselves.
We match you by ZIP code to a local garage door company that serves your area. Some of the companies we match you with are affiliated with Garage Door Science.