Question about Sears Craftsman LiftMaster Chamberlain Garage Door Opener Wireless Keypad Model 976LM Security+

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I have a chamberlain lift master professional 3/4 hp model #3575 the garage door will go down but it will not go up .I only have a wall switch

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If this is single phase motor that is fitted then have a look at the capacitor or replace it as it will have less torque with a weak capacitor. Check also the weakness of the motor if it is DC driven by semiconductor( thyristor/SCR) , IF so the current limiter may be working down.
So give me a feedback on this.

Posted on Aug 31, 2010

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1 Answer

Master lift remotes suddenly won't work. Wired panel button works opening and closing door.


Make sure the light in the wall control is not blinking. If it is press and hold the lock button on the wall control for 3 seconds.

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Craftsman LiftMaster Chamberlain Garage Door Opener Wireless Keypad Model 976LM Security+: I need a remote for a Lift Master Professional ...


The model number will be on the opposite end of where you found the part number you listed. You can then call any Liftmaster dealer listed in your yellow pages.

May 14, 2010 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

Problems with door


Check your door sensors. Make sure the small light on each one is lit and not flickering ever so slightly. Tweak them a bit.

Feb 13, 2010 | Sears Craftsman LiftMaster Chamberlain...

2 Answers

Professional series, lift master 1/3 hp, the remotes will not operate door but door will operate from wall pad


Check to see if the small light in the wall pad is blinking. If so press and hold the button with the lock icon for 3 seconds.

If this isn't the case your receiver may have failed. The wall button works without the receiver;

I would remove the logic board and look for loose or missing traces on the printed circuit board.

Nov 14, 2009 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

I have a Lift Master 1/2 HP Prof. line and remote will not open door but from inside on wall it will if you hold the button for about 5 seconds and then hit the button again it will open door. There is a...


If you have the 3 button wall control you need to press and hold the button with the lock icon for 3 seconds.

You may also need to new wall control. You shouldn't have to hold that button in nor press a second time.

Nov 04, 2009 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

I have a Chamberlain 1265 Lift-Master Professional. Does that model still exist or if not, what has replaced it. Also who carries it


I know that that is a lift-master opener. chamberlain owns lift-master. but if its a new opener your looking for try the lift-master 3800 jack shaft opener. it features a low profile design that mounts next to the door instead of on the ceiling above the door, and also incorporates a battery backup so that you will never be locked out again.

Oct 23, 2009 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

Garage Opener Model 3255 Chamberlain Lift Master


The most common cause of this problem is a bad wall control the wiring going to it. You can eliminate both temporarily by removing the wire at terminal 1 on the back of the motor unit. The wiring sometimes is shorted by the staples the installer uses. The wall control gets used a lot.

Jun 23, 2009 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

Garage Door won't close


It sounds like the door sensors have been bumped or somehow gotten misaligned. Tweak them until the light on each one is lit and not blinking. They must be pointed at one another.

May 30, 2009 | Sears Craftsman LiftMaster Chamberlain...

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