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    dturn85's Avatar
    dturn85 Posts: 1, Reputation: 1
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    #1

    Apr 18, 2012, 10:37 AM
    Why goodman furnace won't heat
    Goodman furnace approx 20 yrs old! Won't come on to heat! Its like its not getting command to heat! Replaced thermostat! Same thing! One time I recycled power from circuit board and it fired up while I was holding in safety switch! Once I let go and put cover back on same thing! Any thoughts?? Thanks
    Stratmando's Avatar
    Stratmando Posts: 11,188, Reputation: 508
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    #2

    Apr 18, 2012, 10:46 AM
    If you hold the switch and it heats, looks like the element is good.
    The thermostat usually connects the red(24 volts)to the w or white wire/terminal. I would jump at thermostat for a test or verify switching of thermostat contacts.
    I wonder if the safety switch is to disable the unit if the cover is removed. Check any switches and look for a diagram. 20 years ago the boards weren't too complicated.
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