Sears Building Materials - Page 3 - Recent Questions, Troubleshooting & Support

take out bolt from rail that trolley is stuck against. try it now. happens sometimes

Sears Craftsman... | Answered on Dec 02, 2017

is trolley jammed against stop bolt. take out to release tension on chain. may be bad circuit board. how old is unit.

Sears Craftsman... | Answered on Nov 18, 2017

Remove the cover from the motor housing and check the drive gear.

Sears Craftsman... | Answered on Nov 17, 2017

The so called experts are really not experts at all and have all diagnosed this problem incorrectly! The problem with your motor is that the Limit switch has either one of the contacts that shut the motor off ..came off the plastic housing ! These adjustable nylon screws clip to the housing that they are secured to sometimes the nylon adjusting screw pops off or it,s copper stop contact has popped off ! This contact or screw whichever has popped off can be snapped back on and in order to do this you would have to take the cover off , Note if your machine is older then 4-5 years it will have these adjustment screws that are called up limit and down limit adjustments on the side of the steel outer casing , anything newer then that has automatic sensing adjustments and will not have these turn screws for manual adjustment !Once the case is removed inspect the limit switch for eithe the contact coming off or the screw itself , simply snap it back in place and with the cover off do your adjustment for the limit of how high or low you want your door to be set at , This adjustment can also be found in the owners manual as well as on line ! Hope this helps you and yes this is the correct diagnosis for your problem , a stripped gear would have absolutely nothing to do with a motor that constantly runs since the sensor that makes contact with the machine when it hits it,s limit automatically stops the motor and since yours keeps running your problem is 100% positive with the limit switch!

Sears Craftsman... | Answered on Nov 09, 2017

Shop for sears craftsman liftmaste... on Google

Garage Door Opener Gear...
Sears Parts D... Liftmaster 41C4220A Ge...
Preferred Do... Chamberlain/l... Sprocket, Gea...
eBay Direct Replacement f...
Moving Up G... Liftmaster 41c4220a gea...
North Shore... Search Results

    Liftmaster Gear And Sprocket Kit 41c4220a Chamberlain ...

    Searsmore info. + -. Chamberlain LiftMaster 41C4220A Gear & Sprocket Assembly Kit. $31.40 ... Chamberlain Sears Craftsman Liftmaster 41A2817 Gear Kit. $27.65 ...

Sears Craftsman... | Answered on Nov 02, 2017

I had the same problem and I found an old Liftmaster keypad instruction handbook. Check out the picture below and follow what it says. It worked for me!
P.S. Sorry if the picture is hard to see.
P.P.S. To change your 4-digit PIN:
Enter existing PIN, press *, enter new PIN and press *. To test and use, enter your new PIN and press the 0 key.

Sears Craftsman... | Answered on Oct 28, 2017

The most common problem for your situation is that the battery in your wallmounted key pad needs to be replaced. unscrew the little screw on the face of the device, remove the battery and replace it with one just like it. Radio shack usually has these batteries

Sears Craftsman... | Answered on Oct 23, 2017

Check this it may be your problem.

Sears Craftsman... | Answered on Oct 22, 2017

For some reason, the bulbs I tested that worked somehow didn't work correctly when inserted into the door opener. We opened another set of bulbs we purchased and what do you know, the light now works. I don't fully understand as the other bulbs did work just not in the garage door opener.

Sears Craftsman... | Answered on Oct 18, 2017

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.

Sears Craftsman... | Answered on Oct 17, 2017

Don't tighten the chain. It sounds like you have either a broken door spring or the drive gear in the motor unit is going bad. Release the opener from the door and operate it by hand. It should be easy enough to raise that your wife can do it with no problems and it should stay put when released about waist to shoulder high.

Sears Craftsman... | Answered on Oct 17, 2017

Sounds like your drive gear is bad. It is a white nylon gear just in front of the motor. It will be obvious.

Sears Craftsman... | Answered on Oct 16, 2017

did you use the manual release to unlatch the door from the opener? You may have a problem with the door binding and opening it manually will confirm that. You may also have misaligned the sensors at the base of the door so check that too.

Sears Craftsman... | Answered on Oct 09, 2017

Check the spring above the door, mine would go up a couple of inches and we found that the spring had broke.

Sears Craftsman... | Answered on Oct 04, 2017

If motor continues to run but no chain action check for missing chain tooth or cam gear worn.

Sears Craftsman... | Answered on Sep 22, 2017

If the chain is loose I would definitely tighten it up to remove the sloppiness of the drive. That will in turn help you to accurately find the sweet spot that is currently eluding you. And you have to work fast because you do not want to overheat the motor.

Sears Craftsman... | Answered on Sep 21, 2017

Not finding what you are looking for?
Sears Logo

Family Lines

5,206 questions posted

Ask a Question

Usually answered in minutes!

Top Sears Building Materials Experts


Level 3 Expert

4369 Answers

Cindy Wells

Level 3 Expert

6196 Answers

Brad Brown

Level 3 Expert

18515 Answers

Are you a Sears Building Material Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides