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Chamberlain model 710whc will not open or close. safety sensor leds are lit. when wall button is pressed a hum is heard followed by several clicks. suggestions?

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6ya6ya
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Posted on Jan 02, 2017

lobsterman72
  • 91 Answers

SOURCE: Door will only close when held down

That normally happens when the sensors aren't aligned. Both sensors have led lights on them the yellow/orange one will stay on all the time the green one will go out if it cant see the other sensor. Possibly theres a wire that's broken or the other sensor is really out of alignment. Check every inch of wiring from the sensor to the opener, remove wire nuts if present and check the connections. The wires that are used are small, solid and can break easily. Also see if there's a staple that's too tight, move the wire abit where it's stapled and look for damage.

Posted on Jun 27, 2008

  • 6 Answers

SOURCE: Chamberlain Liftmaster Pro. Garage door Problems closing

The sensor eye - or more likely, the other end, the sensor light - probably got knocked out of alignment. The eye should have an LED on it - possibly one that glows green when it's ready to close or red when it's obstructed or out of alignment. Try adjusting the light until the LED on the receiver glows green.

Posted on Dec 07, 2008

  • 244 Answers

SOURCE: Garage door opens but does not close

check that lenses on safety beams are clean and that they are aimed at each other so that both have led light on.

Posted on Jan 15, 2009

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SOURCE: Craftsman Garage Opener Clicks only and LED blinking 5 times

first off, hitting extra button on remote would not do anything. Is door up or down/ where is trolley that attaches to chain, by door or motor. Is is jamned against a bolt. Try a paper clip and jump from white to read terminal. Does it work. Does light bulb blink 10 times. I ignore the diagnostic lights and go by symptons. Give more info.

Posted on Feb 12, 2009

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SOURCE: Liftmaster 1/2 horse Model HBW0777 acts like the

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.

Posted on Mar 22, 2010

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Door will not operate unless you hold down button


I am presuming the following: is it that the door will not operate unless you hold down the button to "close the door"? And the button you are pressing is the hardwired wall button or control inside the garage correct? And if you try to close the garage door with the remote the overhead lights flash off and on or the motor make a clicking sound (about 5 clicks?)
The problem is either an obstruction of the safety sensors at the bottom of the door or, one or both sensor eyes are out of alignment. If you look closely at both safety sensor eyes on the part that faces into the garage, you should see a glowing LED. One side will be an Amber color and the other Green. If one is lit (amber) but the other is not (green), that is an indication that the beam is not being received by the receiving eye (amber).
If there is no obvious obstruction (check for spider webs, dust, try cleaning the clear lenses facing each other, etc,) Try re-aligning the sensors. When they are properly aligned the Green LED will be lit. Now, check the motor for operation.
If you have difficulty getting the transmitter eye (green LED) to light, try closing the door at the wall button, then, pull the red emergency release handle to disengage the door.
Now, try operating the motor unit with the door disconnected while using the hand held transmitter. If the motor unit operates to the close position while the door is closed but not when opened, then that sounds like there is sufficient light entering the garage to "Wash" the transmitter beam out so the receiving eye does not get it.
Contact Chamberlain/Liftmaster for Sensor eye blinder shields that can be easily installed by you. (they just snap on) If neither LED is lit, make sure that the wire to the sensor(s) has not been cut off at the sensor itself. If that checks out, check the connection at the logic board. Make sure that both wires are securely connected.
If after checking all of that, and you do not have either of the LEDs on, then disconnect the safety sensor wires from the motor unit's logic board. Then take a 2" piece of bell wire and jump it across the two terminals for the safety sensors. If the unit operates normally when using the hand held transmitter, then the problem is likely: a) Bad safety sensors b) Broken wire to one or both sensors
To check if the safety sensors are good:
Remove both sensors from their mounting brackets. measure about 8" to 12" of wire from the back of the sensors and cut. You should have about 8 - 12 inches of wire on each. Now, separate and strip the insulation from each and then match the white striped wires and twist them together, and do the same with the solid non-striped wires. Take the sensors up to the motor head and connect the spliced wires to their respective positions on the logic board. Now, Point the two sensors directly at each other (its okay if the clear lens part are touching each other) Check if both LEDS are now lit. 1) If YES; then the sensors are good, the wire to them is broken somewhere; [FIX] replace the wires for both sides. 2) If NO: then the safety sensors need to be replaced. [FIX] Replace the sensors, contact Chamberlain / Liftmaster for replacement parts. You will need your garage door opener's model # which can be found under the light bulb or light fixture on the opposite side of the logic board. Having the model # speeds up the parts search for you.
I hope this helps you out. [I have been factory trained on residential and commercial garage door openers by Chamberlain / Liftmaster and have been providing installation and tech support on them for over five years. Prior to that I used to install and repair these units, and I've done that for nearly seven years.]

May 18, 2011 | Chamberlain & Liftmaster Garage Doors

1 Answer

I have a liftmaster garage door opener - the door opens fine but I have to hold the enter key or wall button until the door closes.


By holding down the wall button you are bypassing the photo sensing safety eyes. Look at them at the bottom of the track. Both should have an led light on them and both should be lit. If not try to realign them. If this does not work look at the actual sensors and the wiring for damage. You can test these with a 9v battery. If they are not good you can get replacement units at chamberlain.com, they are sold in pairs. Thanks. BB

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

1 Answer

Craftsman 53918 - 3/4 hp, belt drive garage door opener. Wall unit says safety sensors misaligned. Replaced them as suggested by manual, no fix. Does not appear to be any power from where you plug...


The main light flashing 10 times is the sign of a door sensor problem. Check to see if the small light on each sensors is lit and not flickering. If you cannot get both lights to come on your sensors or the wiring to them is bad.

Sep 30, 2010 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

My keyless opener is 4 years old. the pad and remote will nor open door. Only the button inside of garage functions. WHY?


If they will only raise the door then the problem may be in the safety sensors. Make sure they are aligned and the led light on them are lit. If they will only lower the door then you may have the vacation lock engaged. On the wall button press and hold the lock button for 2 seconds and then try. If they just do not work at all then replace the logic board. Thanks BB

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

2 Answers

Chamberlain 102-1499A Opens w/ remote. Will not close w/remote.


If when you try to close the door the main light flashes 10 times and the door reverses to the open position you have a door sensor problem. Make sure they are pointed at one another and the small light on each one is lit and not flickering. If you cannot get both lights to come on you have a bad sensor.

Jul 23, 2010 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

Wall mount button LED is flashing, remotes won't work, door won't close unless the wall mount button is held down until the door is fully closed


Sounds like you have a couple problems. First of all press and hold the button on the wall control that has a lock icon for 3 seconds and release. This should take care of the flashing LED and the remotes will now work. Having to hold the button on the wall control until the door is closed is usually a problem with the door sensors. Make sure they are pointed at one another and the small light on each is lit and not flickering.

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

2 Answers

Garage door will not close from remote or car.


check the safety photocells is theres not obstacle between then, check both photecells leds are on.. otherwise no need to replace them

Mar 11, 2009 | liftmaster Chamberlain Garage Door Opener...

1 Answer

Garage door will not close


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 21, 2009 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

When remote or door switch is pressed the garage door opener only clicks, the motor attempts to move very slightly. starting capacitor is new.


SOUNDS LIKE A SAFETY EYE PROBLEM.

WILL IT CLOSE IF YOU HOLD DOWN THE WALL BUTTON??

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?

Jul 09, 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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