Question about liftmaster Chamberlain Garage Door Opener Transmitter 300MC

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Door opened and will not close or open now

I have a liftmaster Formula 1 1280R. Door is "stuck" open. Opened with remote, tried to close with wall button, lights came on but no motor. Disconnected door release and tried again, same result. Tried the key pad, pad blinks like there is something blocking the safety sensor and nothing else. Tried the remote, does not not seem to do anything (it is possible that the lights came on like other results). Checked sensors, one orange (sender) one green (mirror), green light goes out when beam is broken. Looked at the basic wiring to make sure nothing disconnected. Tried to move belt by hand but could not move, suspect that this is normal considering the amount of resistance the door has. Any ideas?

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Drive should have a feature to disconnect from door to allow for manual closing.

Posted on Jul 15, 2009

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I have a liftmaster formula 1 1280R opener that works fine from the wall mount but all of a sudden both remotes and the built-in remote in my car stopped working. It is not the batteries in the remotes. ...


The motor/control unit may have gotten reset. It needs to relearn the codes transmitted by the remotes.

MIne has a "learn" button on the control unit. Press and hold, then press the button on the remote. Lights will flash indicating it has received and stored the code. Release button.

Check to see if the remote works now. If so, all three should be working. If not, dig up your manuals.

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I had this problem as well with the door opening just fine but was not closing when using the remotes or when breifly pressing the wall mounted control. The door would close only when using the wired wall mount control. I have experienced this problem with other garage door openers I've had in my previous homes and it was always caused by sensors at the bottom of the door tracks being either misaligned or the lenses were dirty. In this case, and it was just a moment ago today, I simply cleaned the sensor lenses and then the door began to function properly. Give it a try.

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1 Answer

Garage door will not close from remote or car. Garage door will open from remote or car; however, it will not close using these controls. The only way I can close the garage door is to press on the manual...


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The light by the learn button may be sending a diagnostic code. See if it is flashing a number of times, pausing and then repeating. Count the flashes. Is your door stuck in the open posititon?

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If your door is stuck in the open position you need to see if the trolley is jammed against the bolt just in front of the motor unit. If it is, loosen the chain enough to remove the tension from the trolley. Run the motor until the door closes and then locate the 'up limit' on the side of the motor unit. Turn this control 2 full turns in the opposite direction of the arrow printed on the cover. Tighten the chain.

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check the safety photocells is theres not obstacle between then, check both photecells leds are on.. otherwise no need to replace them

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If you can press and hold the wall button and the door will go down, you have a photo eye issue. Check the photo eyes at the bottom of the door.

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check electric saftey beams. shovel blocking them. dirty. aligned (LED on in each unit)

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