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I have a lift master and it will not open from any control lite comes on but no sound from motor greenled appears to flash 5 times unplugged and reestablish power with no results
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29 years is along run on an opener. Personally I would replace it and not spend any money trying to repair it. You can try and find a control panel, or buy a new opener for $200.00 at HD. you can leave track in place replace rollers from new opener box.
If you have a 315MHZ LiftMaster Garage door opener do the following:
Follow the purple wire (Antenna) up and you will see a square purple button.
Press and hold the square purple button for ten seconds until the amber led goes out.
Press and release the purple button one time (The amber led will come on solid).
Press and hold the button on the garage door opener remote control for two seconds (The light bulb on the garage door opener will blink and you will hear a click sound the amber led will go off).
to program the wireless keypad do the following:
Press and release the purple button one time (The amber led will come on solid).
Enter a four digit code into the keypad then press and hold the enter button for two seconds (The light bulb on the garage door opener will blink and you will hear a click sound the amber led will go off).
Sounds like loose connections. Unplug, remove the cover and be sure all connections are tight and secure. While doing this be sure there are no burnt connections or burns on the PCB. Replace cover, plug in and it should be OK.
The code it is flashing is "RPM sensor or motor overload." It is not a door sensor problem. The RPM sensor is a small circuit board just in front of the motor.
Lift-Master 2000SDR opener. Opener generally works fine from the remotes. However, first time in the morning in cooler weather, it will start to close and the reverse and the lights blink. I have checked the senors - appear to be aligned properly. I have lubed the gear and used garage door spray on the rollers and hinges at the proper places. To close the door when this happens, I have to hold the wall button.
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:)
That must be a pretty big door opener. Problem is probably the motor's starting current draw. Most AC induction motors pull 5 to 7 times their rated running current when starting from a dead stop. (about 7,820 watts) That's much more than the surge capacity of a 2.4 Kw inverter. Sounds like you need a bigger inverter or a smaller door motor.
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