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    klhaywood's Avatar
    klhaywood Posts: 1, Reputation: 1
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    #1

    Dec 13, 2012, 03:13 PM
    Goodman Furance GPM
    I have a Goodman GPM furnace. It works intermittently. I checked the breaker, thermostat, Control board and surface igniter. All appears well on start up sequence ; blower runs and igniter heats up and then turns off as no gas comes out. Control board codes says OK and I also turned to fan switch on and it works just no heat. Can anybody recommend what to do next. The house and unit is 10 years old and I have had no problems until now. Thanks
    Grady White's Avatar
    Grady White Posts: 1,417, Reputation: 59
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    #2

    Dec 13, 2012, 06:34 PM
    Do you, at any point during the ignition process, get 24 volts AC to the gas valve?
    T-Top's Avatar
    T-Top Posts: 1,871, Reputation: 100
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    #3

    Dec 13, 2012, 08:12 PM
    It sounds like you have a bad control board. If you had a flame proving fault-(no flame after 24v going to gas valve) or a pressure switch or limit switch open it would give the fault code on the control board. To rule out the thermostat you will need to jumper R to W at the thermostat connections and see if it works. A weak or bad heat anticipator on the thermostat will give the same symptom.
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