Guide :Building Materials : Craftsman LiftMaster Chamberlain Garage Door Opener Wireless...
Light flashing and it won't close
After the day I washed the gargage's floor, it won't close anymore.
No problem on opening. The light was flashing with "da da da da" sound whenever I am trying to close it. really ned help!!
I am sure there is nothing between the sender/receiver sensors, somehow i don't really see the little green in the sender sensor.
For now, I can close the door only if I press the button continuously until the door was closed completely.