LiftMaster code 4-6
The door won’t close because the sensors can’t see each other
You can check thisThe two safety sensors are out of line, or something blocked the beam between them for a moment.
What to do: 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 manuals:
- LiftMaster manual, PDF page 43 for the 8160W and 5 more models
- LiftMaster manual, PDF page 36 for 8587W and 8587WL
- LiftMaster manual, PDF page 38 for 8360W
- LiftMaster manual, PDF page 32 for 8500WMC and 8500WMC-267
- LiftMaster manual, PDF page 44 for the 87504-267 and 4 more models
Which models each manual covers
- LiftMaster manual for models 8160W, 8160WB, 8164W, 8165W, 8365W-267, 8155W
- LiftMaster manual for models 8587W, 8587WL
- LiftMaster manual for model 8360W
- LiftMaster manual for models 8500WMC, 8500WMC-267
- LiftMaster manual for models 87504-267, 84504R, 84505R, 87802, 84602
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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.
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