# LiftMaster code 1-4: the door won’t close because the sensors can’t see each other

Source page: https://garagedoorscience.com/code/liftmaster-error-codes/1-4

## The door won’t close because the sensors can’t see each other

The two safety sensors are out of line, or something blocked the beam between them for a moment.

**You can check this.** Line the sensors up until both of their lights glow steady, without flickering. Move anything that hangs in the doorway or sits on the door in the beam’s path.

From the maker’s manual:
- LiftMaster manual for models 8160W, 8160WB, 8164W, 8165W, 8365W-267, 8155W, PDF page 43: https://cgi.widen.net/content/48v3oqprah/original/114-5713-000.pdf
- LiftMaster manual for models 8587W, 8587WL, PDF page 36: https://cgi.widen.net/content/6mgkh9ncqr/original/114-5802-000.pdf
- LiftMaster manual for model 8360W, PDF page 38: https://cgi.widen.net/content/fagrnphm67/original/114a4914.pdf
- LiftMaster manual for models 8500WMC, 8500WMC-267, PDF page 32: https://cgi.widen.net/content/jwcqmmesfs/original/114-5706-000.pdf
- LiftMaster manual for models 87504-267, 84504R, 84505R, 87802, 84602, PDF page 44: https://cgi.widen.net/content/p6wp8jmdwr/original/114-5898-000.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.