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1/2 hp Craftsman Garage Door Opener, desparately need help!

Posted by flemingtonrookie (My Page) on
Mon, Jul 18, 11 at 16:01

I have a 1/2hp model 139.53973SRT which has been acting very quirky.

Here's what it was been doing (very inconsistent and has now stopped giving problems since this happened a week ago)
-it started that a few times on it's own it opened a few seconds after it closed with no blinking lights
-when going halfway down, it came back up and started blinking as if something was tripping the floor sensors, nothing was
- it then went down and stopped halfway, not blinking, but then when I pressed the wall control it wouldn't move up or down, no lights were blinking and all I would here is a click of sorts when I pushed the button.

I then disconnected the safety to close the door manually, when I reattached it the following day it works fine since, but a little yellow light by the "smart button" keep blinking.

Does anyone know what that light might mean and what could explain the irratic behavior?

Thanks so much in advance!

Follow-Up Postings:

RE: 1/2 hp Craftsman Garage Door Opener, desparately need help!

Random flashing of that LED is normal but it can sometimes send a signal when there is a problem. It will flash a number of times, pause and then repeat.

It sounds like you may possibly have two problems involved here. On the rear of the motor unit you will find a control marked 'down force.' Increase this just a bit. On the side of the motor unit you will find a control marked 'down limit.' Turn this a bit in the opposite direction of the arrow printed on the cover. Some tweaking will be necessary. Both of these problems can be intermittent.

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