Question about liftmaster Chamberlain Garage Door Opener Transmitter 300MC
It sounds like something needs lubrication badly or the track is not aligned properly with the door and it is binding. It is also possible the limit settings are way off. Sorry I cannot offer more help.
Posted on Apr 29, 2014
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Posted on Jan 02, 2017
check to see if your ant. is up inside of the cover it's a little black wire that hangs outside of the operator shiould be about 6 inch.
Posted on Jun 07, 2009
if youcan hear the motor turning when you hit the remote or wall button the plastic gear in the oprator has been ripped and if you take the cover off you will see all of the whote plastic dust that has come from the gear being shreded. You can replace this gear. you do not have to buy a new operator. it is very easy to replace this gear. I can't tell you were to buy one because I buy all my stuff from a dealer.
Posted on Jun 11, 2009
wI have never heard of this problem. you have to hold the button on your wall in to close the door. no way this is not right something wrong with your board insid the opener. get help from a pro. I would love to see this been doing this for 20 years never heard of this.
Posted on Jun 20, 2009
Tips for a great answer:
Mar 16, 2013 | Sears Craftsman LiftMaster Chamberlain...
If when closing the door it reverses to the open position and the main light flashes 10 times it is a door sensor problem. Make sure the small light on each sensor is on and not flickering ever so slightly. (check closely) Tweak them a little even though they may seem to be okay. Check for 5vdc between terminals 2 and 3 on the rear of the motor unit. If there is no voltage or if it is greater than 6vdc the logic board is bad.
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