Craftsman GDO

chrishardingFebruary 8, 2009

Lights in the unit weren't working so I replaced both with new bulbs and now the GDO won't open the door, from either kelyless remote or hardwired wall unit, nor will the new 60W lights in the unit turn on. both sensor lights are working (green and amber). unit has power as I checked the outlet and I can hear the relay clicking for both the lights and the door but nothing happens. noticed the 'learn' light flashes 5 times when I push the door button. Is it circuit board, the unit, or wiring that's toast? Is it fixable by a DIY guy?

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update: door is closed and won't open. read other posts so I checked the stop nut but it's 3-4 inches away from that.

    Bookmark   February 8, 2009 at 5:10PM
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Another post noted that 5 blinks was "Possible RPM sensor failure/Motor Overheated - unplug to reset." I have unplugged for an hour and plugged back in - still nothing. What is RPM sensor? is it a DIY fix?

    Bookmark   February 8, 2009 at 5:56PM
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It's not the RPM sensor. When that goes bad the motor will always run for a few seconds. You need to start by undoing whatever it was you did before it stopped. No matter how silly it sounds although replacing bulbs doesn't normally cause the opener to quit. I would remove the cover and look for loose wires and check the logic board for bad solder connections on the PC board. Be sure to unplug the unit first.

    Bookmark   February 9, 2009 at 9:47AM
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Thanks don_1 but still no go. One original bulb was broken so I couldn't replace it. Pulled the cover and logic board looks fine - no loose connections or bad connections that I can see. No burnt spots either.

Replace circuit board or replace the entire unit?

    Bookmark   February 14, 2009 at 10:57AM
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Update: unit has 2 logic boards - pulled them both out. One board has ic's etc and looks fine...other one has transformer etc and has a burnt spotnear where one of the power leads connects (I think). solder connections look fine and nothing's loose. Replace the board?

    Bookmark   February 14, 2009 at 1:35PM
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If it has 2 boards it may be an older model. Parts might not be available. Go to Sears parts and check. You will need the model number which starts with 139.

    Bookmark   February 15, 2009 at 2:36PM
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