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Liftmaster model 8500, would like to add one extra set of reversing sensors photo eyes , wife closed garage door and car was not fully in garage, door came down on bumper leaving nasty scratch. Bought sensor extensions and moved sensors up from 6 to 20 inchs from floor. Working for car problem but would like lower area covered , bought another set of sensors and parallel wired with original sensors with original single wire home run per side did not work.

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  • Master
  • 15,441 Answers

It is not that easy. instead of using sensors use a tennis ball on a string hanging from the ceiling and when the car is in the garage the correct distance, the ball touches the windshield. The sensors on a garage door opener cannot be installed in a parallel fashion. You could try series on them if you know which side is sender and which is receiver.. Send side wont need to be wired in series.

Posted on May 26, 2017

  • Arthur Leath
    Arthur Leath May 26, 2017

    Case Number: 20170519-145898
    Product: 8500
    Issue: Installation - How do I put it up

    Dear Arthur,

    Thank you for contacting Chamberlain Technical Support. We genuinely apologize for the delay in response. Due to the unexpected overflow of emails we are currently unable to reach our response time but are working as quickly as possible to catch up. Below is a response to the inquiry you recently submitted on our website.

    I'm sorry, the system will only support one set of safety sensors.

    In order to keep your warranty in force, the sensors need to be installed 4-6" from the floor. They are required by law and the distance is primarily to ensure the safety of children.

    You can install a laser parking assist to ensure the vehicle is all the way in the garage before the door is activated.

    If you need further assistance or have questions, please feel free to email me back. If you would prefer that I call you back, please email me the best phone number and time to reach you. Please use case number 20170519-145898.

    Sincerely,
    Catherine

×

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Posted on Jan 02, 2017

ctf1800
  • 4402 Answers

SOURCE: Garage Door Opener Intermittingly Reversing

try adjusted the sensor controls on the sode of the unit other wise replace the logic board
http://www.chamberlain-garage-door-openers.com/circuitboardcompatibilitychart.htm

Posted on Jan 10, 2008

SOURCE: garage door sensors

#2 and 3 on my opener. #1 and 2 are atteched to the wall button. So # 2 has both attached. Hope that helps.

Posted on Aug 24, 2008

  • 244 Answers

SOURCE: 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.

Posted on Jan 15, 2009

  • 244 Answers

SOURCE: liftmaster garage door opener problem

stop adjusting. you are doing right thing. unit will not run down w/o eyes so removing wiring did nothing. you gave clue when yu said they were folloded. buy new set of eyes.

Posted on Jan 15, 2009

  • 3197 Answers

SOURCE: Craftsman LiftMaster Chamberlain Garage Door Opener Wireless Keypad Model 976LM Security+: Can I bypass the sensors on my garage door opener?...

You cannot bypass the sensors but you can try reversing their position so that the sun isn't hitting the receiving unit. You can also move them back from the door or use something like the tube inside a roll of toilet tissue to shade the lens.

Posted on May 20, 2010

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1 Answer

Garage door won't close with remote and I have to hold the pad to make it go down, however it opens just fine.


Your safety reversing sensors must be connected and aligned correctly before the garage door opener will close. An obstruction in the path of the sensor will also cause your door to not close.

This sensor is an electronic beam, which is sent between two sending and receiving "eyes". These eyes face each other and are located just inside your garage door. They may need to be adjusted so the beam from the sending eye is properly detected by the receiving eye. Once the receiving eye "sees" the beam from the sending eye, a green indicator light will glow on the top of the eye. Tweak them a bit. If both lights do not come on you have bad sensors.

Sep 24, 2010 | Sears Craftsman LiftMaster Chamberlain...

2 Answers

Genie garage door will not close if safety photo eye sees sunlite


Most photo electric eyes have sensitivity settings. A small dial or screw that can be adjusted.
If there is none, then another trick would be to recess back further from the actual opening, and put is on the wall as far as possible.
Finally, you could add a tube to act as a sunshield. They probably have one that can be special ordered for it.
And it even that does not work, consider taping a sheet of polarized film over it, like a single sunglass lense.

Apr 19, 2010 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

Door opens but have to hold button in to close


Your safety reversing sensors must be connected and aligned correctly before the garage door opener will close. An obstruction in the path of the sensor will also cause your door to not close.
This sensor is an electronic beam, which is sent between two sending and receiving “eyes”. These eyes face each other and are located just inside your garage door. They may need to be adjusted so the beam from the sending eye is properly detected by the receiving eye. Once the receiving eye “sees” the beam from the sending eye, a green indicator light will glow on the eye.

Jan 29, 2010 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

1/2 HHP lift master. the motor acts like something is in the way


I am assuming the door wont close.

Your safety reversing sensors must be connected and aligned correctly before the garage door opener will close. An obstruction in the path of the sensor will also cause your door to not close.
This sensor is an electronic beam, which is sent between two sending and receiving “eyes”. These eyes face each other and are located just inside your garage door. They may need to be adjusted so the beam from the sending eye is properly detected by the receiving eye. Once the receiving eye “sees” the beam from the sending eye, a green indicator light will glow on the top of the eye.

Jan 03, 2010 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

Reversing sensor blinking


Tweak the sensors to see if you can stop the blinking. They must be pointed at one another and not blinking for them to work properly.

Dec 17, 2009 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

My garage door won't close unless I hold the main button down in the garage. As soon as it closes it opens up again unless I press the button quickly. I can open it up using the remote, but cannot close it...


your garage door has saftey sensors at the door
these are photo eyes
in the owners manuel that came with the opener
that has pictures in it which would help
the photo eyes need to be clear of debri and aimed at each other with no obstruction
there are leds on each sensor and when aimes properly they should be light if i remember correctly
if you can not get them to light then you may have to replace the sensors

Oct 27, 2009 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

The door reverses back to open position instead of closing


SOUNDS LIKE A SENSITIVITY ISSUE UNHOOK THE DOOR AND TRY IT MANUALLY TO BE SURE IT DOESN'T BIND OR IS TOO HARD TO OPEN OR CLOSE.

IF ALL IS WELL CHECK THE SENSITIVITY SETTINGS ON THE BACK OR SIDE OF THE OPENER.

YOU WANT THIS SET AS LOW AS POSSIBLE AND STILL OPERATE THE DOOR WITHOUT REVERSING.

NOTE: THE FULL RANGE OF ADJUSTMENT IS ONLY ABOUT 3/4 TURN SO MAKE A VERY SLIGHT ADJUSTMENT AND THEN TRY IT AGAIN.

HOPE THIS HELPS

Feb 20, 2009 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

Garage Door Opener Intermittingly Reversing


try adjusted the sensor controls on the sode of the unit other wise replace the logic board
http://www.chamberlain-garage-door-openers.com/circuitboardcompatibilitychart.htm

Dec 24, 2007 | Sears Craftsman LiftMaster Chamberlain...

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