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

    Nov 5, 2010, 07:26 AM
    I have Goodman heating unit GMS80903BNA with a diagnostic feature of system lock out
    I have a Goodman heating unit GMS80903BNA that is showing a diagnostic feature 1 flash,then pause on the LED, system lockout. It tries to automatically start up three times with ignitor lighting up and the burner lighting and than it just go out, that's when the LED starts to flash as previously mention. What is the problem?
    Joshdta's Avatar
    Joshdta Posts: 2,549, Reputation: 45
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    #2

    Nov 5, 2010, 07:43 AM

    Clean flame sensor, or may be a drain or pressure switch problem
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