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The garage door opens automatically when we are out.

I have noted that one of the sensors permanently has a red light on.

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Somebody's---radio frequency is matched to your unit somehow--and/or there's another unit made by the same company in the same vicinity using the same codes---with these new (smart etc etc) phones use all types of frequencies with the different apt's for monitoring house systems----you may have to get heavy and call in electronic guru from the company who made your system to find out the issues-GL

Posted on May 03, 2017

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1 Answer

Garage door opener not working


Sensor must show steady light to close circuit and let opener work. If aligned, then there is a loose or broken wire. Try reaiming first to get steady light. Then check all wires . Another way to test and prove that is the issue is if u hold down the wired button at ur back door and the opener closes, then it is sensor issue. Good luck.

Apr 11, 2015 | Genie Company Genie Garage Door Opener...

3 Answers

Garage door light blinks but doesn't stay on


Three blinking lights & door won't close by Candi
(Winston-Salem, NC)
Garage door will not open and close with remotes. Three blinking lights occur when we try to close door. What does this mean? It is a Linear unit.

I will assume you mean that your garage door will open with your remote but will not close. It should close if you press and hold the wall control button until the door is fully closed.

If that is the case, the 3 blinking lights indicate that your garage door's infrared safety beams are not properly aligned.

1) Check that the operator has power. The green lights on the sender and receiver should be lit.

2) If the receiver's green light is on, but the red light is off, the receiver has power but is not detecting the infrared beam from the sender. The red light might flash when the beam is partially detected. This can be caused by
mis-alignment or something blocking the beam.

Adjust the safety beam sender and receiver while watching the receiver's red light (stay out of the beam while aligning it). When the red light stays on, the beam is aligned and your garage door should operate normally.

http://www.linearcorp.com/pdf/manuals/LCO75.pdf

NOTE: If the receiver's red light remains off, check for:

1) Dirt on the receiver's lens,

2) Sunlight shining into the receiver's lens,

3) A short in the safety beam wiring (from staples or at the operator terminals).
http://www.linearcorp.com/pdf/manuals/LCO75.pdf

Dec 02, 2013 | liftmaster Garage Door 1/2 Hp

2 Answers

When the door closes, it automatically reopens. There are no obstructions so that isn't the issue. If I disconnect the door and cycle the automatic is closes and then immediately reopens.


make sure that the auto matic reverse circuit light is being read correctly. they is a light extending a beam of infared light, you can't see it, to a reflector across the garage at the floor level at the garage opening. There should be an indicator light, usually green and red. Line up the light and reflector until the green light comes on.

Mar 08, 2011 | liftmaster Chamberlain Garage Door Opener...

1 Answer

Have a Craftsman 1/2hp garage door opener (HBW0777 year 1994). It won't close and goes back while blinking 8 or 9 times. Transmitting sensor (red light) is blinking 3 times (even i hold the two sensor...


Anytime the main light flashes 10 times and the door reverses to the open position it is a door sensor problem. If the transmitting sensor light is blinking it is bad.

Nov 20, 2010 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

Garage door will not open manually or automatically/normally


The color of the sensors is normal and have nothing to do with your problem. If you cannot raise the door manually and it is released from the opener then you have a door problem. If you mean the door won't open and you cannot get into the garage to release the opener then you are going to have to call a door technician for help. He will get in.

Feb 08, 2010 | Sears Craftsman LiftMaster Chamberlain...

2 Answers

My red light sensor is blinking constantly and the green light sensor is steady. I grab hold of the red light sensor and squeeze and the light goes solid and I am able to close the garage door. when i let...


It sounds like there might be a loose wire connection on the inside of the sensor. You could also be moving the position of the sensor slightly into alignment when you squeeze the sensor. You will need to disconnect the wires for the sensor on the garage door opener or disconnect the power. Then use a flatblade screw driver and carefully seperate the sensor case. Check for any loose connections on the wiring(you might need to re-solder the wire to the sensor eye). It sounds like a loose wire connection to me.

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

1 Answer

Why garage door close half way and opens again.


Both sensors should have a small light that is lit. Sometimes the sensors will get bumped and if they are not pointed at one another the light will go out on one of them. Tweak them a bit and see if the light doesn't come on. If not you have a bad sensor.

Sep 16, 2009 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

Replaced door sensors now door will not go down and light flashes


The safety eyes are either installed wrong, or you have the wrong type. Craftsman (liftmaster) has what they they call old style and new style safety eyes. You can not interchange the types.

Feb 16, 2009 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

My Wayne Dalton garage door will open with remote but not close. The only way it will close is to hold down the wall mounted garage door button. Then the light goes on and off while clicking. I have...


your infrared sensor is either misaligned, faulty, or you have a broken wire from your sensor to your door opener. (Flashing light indicates infrared light path is broken). both sensors should indicate green led. door wil not come down is safty feature to prevent door from closing when light path is broken.

Jan 15, 2009 | Sears Craftsman LiftMaster Chamberlain...

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