Question about liftmaster Chamberlain Garage Door Opener Transmitter 300MC

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How do I uninstall my garage door sensors. They continue to give me problems, it acts like there is something in front of the sensor and prevents the door from closing.

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When you say sensors, are you talking about the photo-eye that checks if obstruction is in path of garage door?

1) You can buy sensors for $20-30. They seem generic

2) The new openers may be set up so by-pass is not an option.
Solution: In that case, you can move sensors above the garage door and put them face to face to see if that helps.

3) The way the sensors work is this. One side produces beam of light. Other side receives light. The receiver keeps a circuit closed at all times when light is received. If no light, then the circuit opens up and an electronic part interprets the lack of signal and turns off opener.

Solution: one side produces light. It does not have a switch. The other side has the switch. You can disconnect (or cut) a wire see which side has the light. The other side has the switch ... cut the 2 wires on the side with a switch, cap them off, and then see if opener works. Next twist the 2 wires together and see if opener works.

4) Fall-back position: Mark your wires and you can put it back the way it was.

Posted on Oct 07, 2010

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Owners Manual for Chamberlain Garage Door opener. Model 2265R


Unfortunately, the 2265R is not a Chamberlain supported model. The manuals for supported garage door openers are list here: http://www.chamberlain.com/parts-and-support/installation-manuals . The manual for the 2265 is here: http://www.chamberlain.com/CatalogResourcesV3/en-us/shared/files/tucmanuals/A2497M.PDF . There is also the 2265C: http://www.chamberlain.com/CatalogResourcesV3/en-us/shared/files/tucmanuals/A2512M.PDF .

It could be that the 2265R is a refurbished model. Then the manual for the 2265 garage door opener will give you the the correct manual.

In my experience, when the garage door goes down partway and then reverses completely, the problem is something breaking the light beam between the safety sensors. This can be a piece of grass or the shadow from the door when one or both sensors are getting full sun. If the problem is some weed getting pushed into the sensor range, simply cut the nearby grass shorter. To check if the problem is a shadow, try getting a couple of people to stand near (but outside) of the garage door. They should be positioned to cast a shadow on the sensors. If the door closes properly when the button is pressed, then the solution is to wait for a slightly different sun position to close the door or to continue to hold the button on the wall panel.

I hope this helps.

Cindy Wells

Jun 14, 2016 | Building Materials

1 Answer

I'm having to hold the main remote button down continuously to get the door to close. It acts like something is obstructing the path, but it's clear. The sensors have a green light on one and a...


You need to hook those wires back up and then check the door sensors very closely. If the light in one of the door sensors is dim or flashing it will cause your problem.

Sep 12, 2011 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

Door will not stay closed. continues to open unless disconnected. checked for obstruction to sensors not the issue. seems to be something with the track. solutions??


If the main light flashes 10 times when the door reverses it is a problem with the door sensors. Make sure the small light on each sensor is lit and not flickering. Tweak them a bit. If you cannot get both lights to come on you have bad sensor or the wiring to them.

Nov 01, 2010 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

My Craftsman 1/2 hp garage door opener will go up fine with the push of any button but it starts then stops when I try to push the button for it to go down. It acts like there is something in front of the...


If the main light flashes 10 times when the door stops it is a door sensor problem. Make sure the small light on each one is lit and not flickering. If the main light doesn't flash you have either a bad IR sensor which is a small printed circuit board just in front of the motor or you need to increase the down force which is a control on the rear of the motor unit.

May 10, 2010 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

Liftmaster 1/2 horse Model HBW0777 acts like the safety sensor is stuck (door won't continue down - re-opens when you let go of the wall button. I can close it with the wall button but I need to hold it...


If the main light flashes 10 times when the door reverses it is a door sensor problem. Look closely at the green lights to make sure one isn't flickering ever so slightly. Tweak them a bit.

Mar 22, 2010 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

My Craftsman 1/2 HP garage door opener will go up fine with the push of any button, but it starts then stops when I try to push the button for it to go down. It acts like there is something in front of the...


If the main light flashes 10 times and the door reverses to the open position it is a door sensor problem. Make sure the small light on each sensor is lit and not flickering. If they aren't lit tweak them a bit. If they both won't come on you have a bad sensor or the wiring leading to it.

If the main light doesn't flash 10 times you can increase the 'down force' which is a control on the rear of the motor unit. Increase this just a bit and try.

Mar 16, 2010 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

Door will not close, acts as if there is something in the way


The sensors may have been bumped so that they are no longer aligned. Tweak them and see if that light doesn't come on steady. If it doesn't you will need new sensors.

Jun 07, 2009 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

Wont open or close/lite flashes and clicks.


two problems. recode your remote control. are led lights on both sensors. clean lenses. aim at each other. should cure.

Dec 13, 2008 | Sears Craftsman LiftMaster Chamberlain...

2 Answers

Garage Door


Are the sensor lights located on each side of the garage door opening? Have you checked to see if they are in alignment with each other? Also check to see that any wire from the sensors are disconnected on the motor or at the sensor itself. Good Luck! Countrycurt0

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

2 Answers

SEARS/CRAFTSMAN 53628SRT Not Closing properly


sounds like the safety door sensors are at fault,also did you reprogram the remotes by pressing the smart button on the logic board,when the safety sensors are bad the door will reverse to open state.you can pully the rip cord to manualy close the door untill you solve the problem.

Sep 04, 2007 | Sears Craftsman LiftMaster Chamberlain...

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