liftmaster Building Materials - Recent Questions, Troubleshooting & Support
Garage door does operate at
If these problems started immediately after a lightning storm, the printed circuit board is probably damaged. Contact a garage door service company (check the phonebook) for diagnostic support.
Why does my garage door close and then go back up?
This will happen if the IR sensor are sensing an obstruction while the door is closing OR if the IR sensors are defective. As a first option, check to see if any object is stuck to the door (possibly low down) that is triggering the IR sensor.
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I have 2 lift master garage door openers that are
If your garage door is up, and you break the beam (by walking through it, for example), you will get the "SENSOR WIRING INTERMITTENT CONNECTION ERROR CODE 1-4 SEE USER MANUAL". This is normal. Both of my Liftmaster 8550 openers do this. It's misleading, but this is what I've found to cause this error.
My garage door won't go down and keeps blinking 10 times.
first, hold the wall button down and do not let up and the door will close for you. second, one of the wires to your sensors is loose, broken or shorted out by a staple thru the insulation. you can bypass the sensors on a temporary basis while you find the issue, by jumping the sensor connections at the motor.
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