Question about liftmaster Chamberlain Garage Door Opener Transmitter 300MC

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Door will not close unless you hold hard wired button in till clo

I know its in the saftey sensers this problem accured after imoved the wires to put insulation up on ceiling i moved wires around and the lites on sensers lite so i got new wire andwired them with no luck my question is can i test the board were the wires come out of the opener ,shouid i have a voltage there can i jump something to take the sensers out of the system any help will be thankfull

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You can jump the sensors out to test them. Just attach a wire between the two opposite points and then test to see if that's your problem.

Posted on Jul 04, 2009

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1 Answer

Lights blinking 5 times and door won't close


generally, that means that the electric eye is blocked or misaligned and as a safety the door will not close unless you hold down the wired open/close button. or a broken wire in the electric eye wiring.

Mar 16, 2015 | Building Materials

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

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...

1 Answer

I have to hold down the wired button till the door is all the way closed, If I use the wired in keypad , I have to hit the button twice holding it down the second time till door is all the way closed, it...


Check your door sensors. They need to be pointed at one another and each of them has a small light that must be lit and not flickering. If one or both of the lights are out and tweaking them doesn't correct it your sensors are bad.

Mar 09, 2010 | 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

My garage door will not close unless...


Check your down limit switch and even your up one too almost sounds like one is stuck one way or the other.

Jun 19, 2009 | liftmaster Chamberlain Garage Door Opener...

1 Answer

Craftsman garage door opener - Clicking/blinking - no open/close


First, check the safety eyes. There should be a light on each eye that is on. If not, realign the eyes. If that does not work, check the force settings. They are the blue adjustment screws. They should be set on 4-5. Do not go above 6 or there is a problem with either the door or opener, or both. If this does not work check all of the wiring on the back of the opener. 1 should be a red wire, 2 should be three white wires and 3 should be two black wires. Check the wiring to the wall button. the back of the button indicates red and white screws. To take off the wall button you will have to remove the big white button if you have the "deluxe wall control" If this does not fix it, respond with more info on door position and what happens with remotes and wall button.

Feb 25, 2009 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

Sears craftsman garage door opener


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 13, 2008 | Sears Craftsman LiftMaster Chamberlain...

2 Answers

How do you bypass sensors for craftsman garage door opener


The sensors are safety features so the door won't close on someone. When you hold the wall button down it's over riding the sensors, therefore it works when you hold down the button but will not work when you tap it or use the remote. Line up the photo cells so they stop blinking. If they're blinking they think something is in the way...hence not closing. If you can't get them to line up and stop blinking one may be defective. Contact the manufacturer and see if you can purchase a replacement set. They usually aren't too expensive, maybe $20/$40.

Mar 01, 2008 | Seagate FreeAgent Go 250 GB USB 2.0 Hard...

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