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

    Jun 13, 2007, 03:01 PM
    A/C Blower fan not working
    Blower fan does not work in a/c mode, but if I switch it to heat the fan kicks on and starts blowing hot air.
    hvacservicetech_07's Avatar
    hvacservicetech_07 Posts: 1,083, Reputation: 75
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    #2

    Jun 13, 2007, 06:30 PM
    What model is the furnace? It may be a bad relay, or circuit board, try switching the thermostat to the "on" fan position. Does this bring the fan on? If so you have a bad thermostat.
    NorthernHeat's Avatar
    NorthernHeat Posts: 1,455, Reputation: 132
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    #3

    Jun 14, 2007, 01:39 PM
    Quote Originally Posted by hvacservicetech_07
    What model is the furnace? it may be a bad relay, or circut board, try switching the thermostat to the "on" fan position. Does this bring the fan on? if so you have a bad thermostat.
    I disagree about the idea of "If you turn the fan switch to on". Some of the newer furnaces have a fan speed relay and a cooling speed relay on the PC board. Fan could still come on and the cooling speed relay is bad. Oh! The good old days when I could diagnose 95% of all HVAC problems without a volt/ohm meter.
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