Question about liftmaster Chamberlain Garage Door Opener Transmitter 300MC

1 Answer

Safety sensors Can i bypass the electric eye safety sensors? I do not have a green light on the sensors. The green reset light on the back of the garage door opener will not stay on.

Posted by on

1 Answer

  • Level 2:

    An expert who has achieved level 2 by getting 100 points

    All-Star:

    An expert that got 10 achievements.

    MVP:

    An expert that got 5 achievements.

    Mentor:

    An expert who has written 3 tips or uploaded 2 video tips.

  • Expert
  • 448 Answers

Pull the contact wires off the back of the eyes. If this is found helpful, please post as such. Post as fixya if it gets the desired effect. TY

Posted on Jan 16, 2009

1 Suggested Answer

6ya6ya
  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

Hi,
a 6ya expert can help you resolve that issue over the phone in a minute or two.
best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.
goodluck!

Posted on Jan 02, 2017

Add Your Answer

Uploading: 0%

my-video-file.mp4

Complete. Click "Add" to insert your video. Add

×

Loading...
Loading...

Related Questions:

2 Answers

How do you align the safety sensors for a lifmaster garage door


The indicator lights in both sending and receiving eyes with glow steady if wiring and alignment are correct.
http://waterheatertimer.org/pdf/Liftmaster-safety-reversing-system.pdf
Connect the wires together on safety sensor receiver (with green indicator light), so it by-passes safety system.
The safety system consists of sender with amber light, and receiver with green indicator. Receiver must receive light in order to keep switch circuit closed. If receiver receives no light from sender, then switch opens, and garage door will not function.
Connect both wires on receiver will simulate the closed switch, as if receiver is receiving beam of light.
You can order replacement sensors from amazon

May 28, 2013 | Electrical Supplies

1 Answer

Green senor light blinks on and off. Can only open garage from wall opener . There is no senor blockage.


WHAT GREEN SENSOR LIGHT ARE YOU REFERING TO.

IF YOU MEAN THE WALL BUTTON LIGHT - THAT WOULD TELL YOU THET THE LOCK BUTTON IS ACTIVATED LOCKING OUT ALL RADIO CONTROLS - PRESS & HOLD THE LOCK BUTTON FOR 3 SECONDS THAT WILL TURN OFF THE LOCK FEATURE - PROBLEM SOLVED.

IF YOU MEAN THE GREEN LIGHT ON THE SAFETY EYE - CHECK THE WIRING IT COULD BE A BROKEN WIRE OR REVERSED POLARITY - ALSO BE SURE THE UNITS ARE PROPERLY AIMED AT EACH OTHER.

HOPE THIS HELPS

Nov 09, 2010 | liftmaster Chamberlain Garage Door Opener...

1 Answer

Garage door won't close unless I hold down the wall button until it is fully closed. Checked the L.E.D light at motor and it flashes 2 times in about 8 seconds. Sensor with amber light is on, other does...



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


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.

Oct 09, 2010 | liftmaster Chamberlain Garage Door Opener...

1 Answer

How do I allign electric eyes on bottom of door?


These safety sensors do not have to be exact but need to point at each other. Make sure there is no obstruction like leaves... Also make sure the surface they are attached to is stable as well. To align them there will be a wing nut or some other type of adjustment on the sensor assembly. Thanks BB

Sep 02, 2010 | liftmaster Chamberlain Garage Door Opener...

1 Answer

The door will not close all tthe way unless you hold the button down


HOLDING DOWN THE WALL BUTTON OVERRIDES THE SAFETY EYES.

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 OTHER?


HOPE THIS HELPS

Aug 24, 2010 | liftmaster Chamberlain Garage Door Opener...

2 Answers

In the bright sun light my garage door will close part way then reverse,i have keep pushing the button and it will move a little further. it only happens when the sun is shinning on it


I'm a license electrician, I can only think of two possiblities, either the sun is interfering with an infrared safety switch or it's causing your safety switch mechanism to overheat.
The most common is the floor level beam, if possible try to shade your safety switch plus a few inches beyond the lense.
If you have the touch strip on the bottom of the door I'm afraid I don't have a solution beyond replacing the strip and I'm not sure that will work.

Jun 04, 2010 | liftmaster Chamberlain Garage Door Opener...

1 Answer

My Liftmaster 1/2 H.P. opens but cannot be closed (without depressing the button on the wall until the garage door comes down all the way. Any help will be much appreciated


HOLDING DOWN THE WALL BUTTON OVERRIDES THE SAFETY EYES.
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 OTHER?

Jan 25, 2010 | liftmaster Chamberlain Garage Door Opener...

1 Answer

The door won't go down with remote, you must hold the hard wired button. green light is flashing 4 times on the back of the opener itself. what can be the problem. the door has never been right since we...


HOLDING DOWN THE WALL BUTTON OVERRIDES THE SAFETY EYES.
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 OTHER?

Jan 15, 2010 | liftmaster Chamberlain Garage Door Opener...

Not finding what you are looking for?
liftmaster Chamberlain Garage Door Opener Transmitter 300MC Logo

697 people viewed this question

Ask a Question

Usually answered in minutes!

Top liftmaster Electrical Supplies Experts

Mike

Level 3 Expert

4332 Answers

Gil Shultz

Level 3 Expert

3320 Answers

ray gallant

Level 3 Expert

37696 Answers

Are you a liftmaster Electrical Supply Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

Loading...