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    joenovak1836's Avatar
    joenovak1836 Posts: 1, Reputation: 1
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    #1

    Oct 24, 2010, 03:31 PM
    Gmp100-3 won't stay lit
    I have a goodman gmp100-3 furnace. It fires up but then shuts off right away (within 5 sec). Led light blinks once. I replaced the flame sensor, and the flame looks good and strong. Why won't it keep lit and heat my home?
    Joshdta's Avatar
    Joshdta Posts: 2,549, Reputation: 45
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    #2

    Oct 24, 2010, 04:01 PM

    I have never seen a flame sencer go bad. What is the fault code for 1? Should be on the control, or on the back of the door. Most likely a pressure switch problem

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