Question about liftmaster Chamberlain Garage Door Opener Transmitter 300MC

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Liftmaster Professional 1/2 hp #2255-2. Opens a few inches then reverses. I unhooked the door from the chain and door moves easily.

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SOURCE: garage door opens about 8 inches and then revereses

Formula what? they have over forty different types. though sounds something like either limit switches may be faulty. Is this door new? Are there any odd noises from the motor?

Posted on Mar 22, 2009

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SOURCE: door won't go down. Moves two inches and then

push the green button on the back of the motor drive now push and hold the remote button see if that fixes

Posted on Jun 22, 2010

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Motor is running but the chain is not moving. When I assist it moves a few inches then stops again....in both directions. Almost as if teeth are boken in a wheel.


You are correct. There is a gear drive system and the gear is stripped. you can have the gear replaced and not have to purchase a new lift.

May 17, 2011 | liftmaster Garage Door 1/2 Hp

1 Answer

I have two craftsman door openers. They work great with pushbutton on wall, open and close ok. The door opens fine with remotes ( one handheld other homelink in car ) but will not close with remote. It...


If the main light flashes 10 times and the door reverses to the open position it is a door sensor problem. Make sure the lights on the sensors are both on and not flickering. Tweak them if necessary. If you cannot get both lights to come on you have bad sensors or the wiring to them.

Dec 27, 2010 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

My opener is a 1/2 horse lift master professional chain drive . The door will not close unless you hold the closer button in. From the remote it will only move a few inches and then reverse. The door works...


If the main light flashes 10 times when the door reverses it is a door sensor problem. If not, you probably have a bad RPM sensor board which is a small printed circuit board just in front of the motor.

Jun 28, 2010 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

Garage door opens about 8 inches and then revereses


Formula what? they have over forty different types. though sounds something like either limit switches may be faulty. Is this door new? Are there any odd noises from the motor?

Mar 21, 2009 | liftmaster Chamberlain Garage Door Opener...

2 Answers

GARAGE DOOR OPENS BUT WILL NOT CLOSE AUTOMATICALLY


is bulb on motor flashing 10 times. then you have electric eye problem. otherwise, sounds like you need to increase down force a hair. adjustement is on logic board, right knob.

Jan 06, 2009 | Sears Craftsman LiftMaster Chamberlain...

2 Answers

Chamberlain Liftmaster Professional 1/2 HP


Okay...upon further inspection, my left spring has broken in two. Going to call around for some quotes to replace the spring. Thanks for the suggestions.

Jul 21, 2008 | Sears Craftsman LiftMaster Chamberlain...

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