Question about liftmaster Chamberlain Garage Door Opener Transmitter 300MC

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Liftmaster hbw0777 light not working - liftmaster Chamberlain Garage Door Opener Transmitter 300MC

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Have you replaced the battery? If you have ensure the battery is the correct way round, if still not working it is probably faulty

Posted on Jul 17, 2011

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HBW0777 Liftmaster garage door opener will not close unless wall button is held down. Weirdly enough it only does this in early fall to early spring for last 3 years. What can I do to fix it?


Have the wiring checked out for proper voltage and ground, when it is acting up. The seasonal change may affect the ground rod, it may not be well grounded.

Nov 26, 2013 | liftmaster Garage Door 1/2 Hp

1 Answer

Hbw0777 remote not working


to best of my knowledge no such remote. Do you mean the 976lm. Did you try changing batteries and press the learn button on the opener.?

Oct 25, 2012 | Sears Craftsman LiftMaster Chamberlain...

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I have the door bell style wall button-how do I unlock the unit so the remotes can be synched? I have pressed green button on back of unit with remotes but they won't operate the door.


You don't unlock anything to program the opener for the remotes. If everything is working you do this:

Press and hold the button down on the remote while you press and immediately release the smart/learn button. Do this for each remote.

Jul 11, 2012 | Sears Craftsman LiftMaster Chamberlain...

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HBW0777 garage door opener. pulled debris from around one sensor light. Now neither sensor light is on.


You may have broken the wire going to the sensor. Some older models have wiring that unplugs at the sensor. This could be the case here and it is unplugged.

May 07, 2011 | Sears Craftsman LiftMaster Chamberlain...

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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...

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Liftmaster 1/2 horse Model HBW0777 acts like the safety sensor is stuck (door won't continue down - re-opens when you let go of the wall button. I can close it with the wall button but I need to hold it...


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.

Mar 22, 2010 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

Where is training button located on Craftsman garage door opener model HBW0777


The button is located on the rear of the motor unit near where all those white wires go.

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

1 Answer

Photo eyes inop, opener still operates


if eyes came with opener, that is good. clean off lens. are both eyes leds lit. try aligning again. New eyes avail for $30 if you want to try.

Jan 07, 2009 | Sears Craftsman LiftMaster Chamberlain...

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