Coleman furnace DGAT070BDD HELP!

Questions about repairs and parts for Coleman furnaces, air conditioners and heat pumps for manufactured homes. Click here for Coleman parts.

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Coleman furnace DGAT070BDD blower runs when no call for heat or ac. Turn thermostat to heat, furnace will ingnite blower will start up, flame will go out and flash code 5 [gas valve energized no call for heat]. Replaced two circuit boards ,booster motor,flame sensor, upper and lower limit switches.Tech's cannot fix it. You can turn power on to furnace with thermostat off, blower will come on after a short while. Thought power transformer might be bad interrupting circuit board. Any help will be very much appreciated.
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Robert
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Posts: 6413
Joined: Wed Feb 28, 2007 12:07 am
Location: Tennessee

Hi,

You will have to check/test entire circuitry inch by inch. Check for proper polarity and good grounds.


Disconnect all connections (write down where wires go) and test each segment and only hook that section of wire up after it tests out ok.

I hope you didn't pay for all those parts at expense of those Techs.



Thanks,
Robert
Some people are Humbly Grateful, while some are Grumbly Hateful.................... Which one are you ?
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