1/2 hp liftmaster closer stalls while closing in cold weather

they had door closer problems make sure door it fully closed and not staying open just slitely and letting air out, hing closer is plactic pieces on ref door bottom and piece on hing itself.
for parts go to (coolblueworld.com) THIS IS FISHER PAYKEL WED SIGHT.

Replace button on wall. Check wiring between button and opener.
Look at product manual and see if manual has troubleshoot section.
If there is no wire between wall button and opener, the remote may be one of those 'self learning' unit and may have to be reprogrammed. And -or battery replaced.
Otherwise the wall button connects directly to circuit board on opener, and cannot be repaired without ... parts, schematic, electronic knowledge.
Replace garage door opener.
http://waterheatertimer.org/pdf/Liftmaster-garage-door-manual.pdf
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I have found that not closing is because the door sensors are either blocked from viewing each other, or one of them is turned so it does not "see" the other, If they look like they are aimed right, check that the wiring for them goes to the door closer without breaks. Probably you can try hot-wiring the connectors at the door closer to see if it solves the problem, and then figure out where the disconnect is.

Your open close knob probably needs to be adjusted. If the door is closed,you need to take the closer in one hand,and turn the open close knob toward open until it opens. The chain must have jumped over the sprocket. Doo the opposite if the door is staying open.

thanks w/d for getting right on my problem,my closer doesnt have lights at the bottom, it's a garage sale deal. works good otherwise exept I have to hold closer button on the wall to close.

Check the sensors in the doorway. Sounds like they may be misaligned. They need to be pointing at one another to work properly.

Garage door work like a wedge. As it goes down the door get closer to the jam. So if you moove the weather stips closer to the door that probebly solve your problem. Do that whith the door complitely close.

Good day Paul

Some electronic components become sensitive to thermal changes and there is no fix other than replacement.

At your dads end, does it show that his webcam is being viewd..? It could be that there is not much light at your dads end.

My service shop says that the sensors can go bad and still have the lights on steady. Also sun lite on the receiver sensor (green led) can cause a problem or if they have gotten wet.

Play with the alignment and if still a problem new sensors are about $40 a pair. Or if you have another door that works OK, swap the sensors to see if that is the problem.