Question about liftmaster Chamberlain Garage Door Opener Transmitter 300MC

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Garage door opener will not respond to security plus remotes

Door opened and closed fine in the am; in evening when attempted to open the door using remotes it would not open, would open with hard wired control; would close using hardwired control but not remote; changed batteries, no effect; attempted to reprogram remotes using smart button, remotes would not reprogram; went online to check faq for suggestions - the two offered were change batteries in remotes and reprogram; NEED HELP

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Reset the Liftmaster unit. There should be a red reset button on the unit in the garage. If this does not work, reset the breaker. Good Luck!

Posted on Jul 22, 2009

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Posted on Jan 02, 2017

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Digidoor remote


"Another reason is problems with the radio frequency of the remote control system used, some older systems use frequencies that are liable to interference from various sources such as police and fire department radios and military communications. The effects of this interference are many for example, the garage door may open and close on its own or the operating range of your remote control may become so poor you cannot open or close the door with your remote control even whilst standing next to it."
source

Jul 29, 2013 | Audio Players & Recorders

1 Answer

Lift master formula I will not close, only goes half way down, but fully opens. Worked fine until my wife closed the door on the car, after that it would fully close


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.

Jan 28, 2013 | liftmaster Chamberlain Garage Door Opener...

1 Answer

My garage door will only open half way. It appears to be getting stuck when it is opening.


If you haven't gotten your issue fixed yet... I had the same problem (stopped opening half way when using the remote, went down fine, could lift/close manually fine as well) and this happened on our first cold weather day of the year which was very telling. Anyhow, there are two gauges/dials on your garage door opener unit itself (above, where the light is) which controls how much torque/strength your door uses to open or shut through resistance. I turned mine up some and it now works fine; what likely happened was that the metal tracks or the wood frame condensed in the cold and was providing just enough resistance to stop it when opening - as they have a security device built in to stop if they meet any resistance. Hopefully this helps!

Oct 27, 2012 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

Liftmaster 1245R problems


Contact Liftmaster thru their website and ask tech support .the remote may need reprogrammed or Paired to the drive unit

Oct 06, 2017 | Home Security

1 Answer

Garage door won't open or close using remote (light on lifter flashes twice) but will open and close using the button inside the garage.



WHEN HOLDING IT DOWN MAKES THE DOOR CLOSE PROPERLY THE PROBLEM IS IN THE SAFETY EYES.


ARE BOTH LEDS ON? - CHECK FOR A LOOSE OR BROKEN WIRE.

ARE THE EYES WIRED CORRECTLY?

ARE THEY AIMED AT EACH HOLDING DOWN THE WALL BUTTON OVERRIDES THE SAFETY EYES.

OTHER?

Oct 10, 2010 | Chamberlain Powerdrive PD422D 1/2 HP...

1 Answer

When I use my remote control to unlock my door it doesn't work. I changed the battery. After I open the door the remote start to work even if I close the door again.


Likely problem? It sounds like you have a pinched power wire somewhere, cutting off power to the remote control receiver when the door is closed, I'd have the dealership check it out.

May 25, 2010 | 2000 Chevrolet Impala

1 Answer

Outside keypad will not open or close door,but the control inside works. put new battery in no help


The wall control is hard wired to the opener and doesn't use the receiver. The keypad does use the receiver. If you have hand remotes that work then it is your keypad that has quit working. Without remotes you cannot know if it is the keypad or the receiver.

Mar 09, 2010 | Sears Craftsman LiftMaster Chamberlain...

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