Question about liftmaster Chamberlain Garage Door Opener Transmitter 300MC
I have a Lift-Master 1/2 hp garage door opener that was installed when the house was built, circa 1997. It's worked fine for 12 years. Now when I push the wall button to open the garage door, the opener box clicks once and then a green light blinks 5 times in succession, then there
s a wait, and then 5 again.The opener doesn't make any other sound but the single click when you push in the button, followed by the 5 blinks of the green light.
I tried everything on mine which had the same problem. I cleaned the the circuit board with a toothbrush to remove some of the excess grease which had flung off the cogs then tried unplugging and plugging back in again and it worked. Mind you I did try unplugging it before several times which didn't work until I cleaned the circuit board. Hope this helps.
Posted on Apr 25, 2013
This might be VERY basic, but this happened to me.
Do you have attic space just above the garage? Could there be a heavy box on top of some wires? Those wires seem to be very sensitive & as soon as I moved the boxes off of some wires that looked like phone wires it WORKED like normal.
Posted on Aug 14, 2009
The motor will probably need rewinding.
Professional job. Don't forget to take the condensor with the motor.
Or alternatively, if money isn't a problem,, get somebody out to look at it.
There ya go:)
Posted on Jul 27, 2009
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Posted on Jan 02, 2017
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