Question about Goodman GDS80703ANA Open Flame Mid-Size Heater

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Goodman gds80703 turns on and off intermittendly 3 light blinks

My goodman furnace sometimes turns on and immediately works, other but alot of the time i flip the main power switch off and turn the thermostat all the way down then back up and flip the switch back on and it does nothing. its really cold in my house as i live in michigan and i dont know what to do. it is odd when i turn it on, the fan kicks on, and the board clicks, the pilot glows, then the board clicks again then the pilot goes dark and the fan just turns on. like i said it works intermittently and i dont know what the problem is. someone please help and if i need a part please tell me where it can be located. im desperate

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  • chris_s_isaa Feb 15, 2009

    oh yea i forgot. the board was replaced like sometime last year, so i dont believe thats the problem... thanks

  • chris_s_isaa Feb 18, 2009

    it flashes 3 times and says pressure switch stuck open

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Have you check to see if the direct drive motor comes on. (The big one on the bottom of the unit). Turn your thermostat up and then go down to the unit shut off the switch attached to the unit and turn back on. See if the start sequence works. (small motor starts to spin,(top of unit), the flame sensor comes on, and the gas ignites. Once the unit has warmed up enough the main motor on the bottom should start to turn and blow warm air into the vents. If the motor does not turn on, the limit switch cuts on and turns off the gas flow. I replaced the main motor myself and my furnance has worked fine ever since.

Posted on Mar 07, 2009

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There will be a diagnostic code that will blink on the control board. Look thru the clear window at the control board after the unit does not light up. On the reverse of the front panel, you will find a wiring diagram and in that area there will be a diagnostic code table. Sounds like a bad gas valve.

Posted on Feb 18, 2009

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