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    don j's Avatar
    don j Posts: 1, Reputation: 1
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    #1

    Nov 22, 2005, 01:34 PM
    Forced air heater
    Blows 3 amp fuse. After fuse blows fan comes on. Ignitor works prior to fuse blowing but no gas. One resistor on board appears to have black mark.
    labman's Avatar
    labman Posts: 10,580, Reputation: 551
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    #2

    Nov 22, 2005, 04:51 PM
    This is not a common, easy problem I can just paste in an old answer for. Which blower, the main one that circulates the air, or a small one for the combustion air? Normally the air handler wouldn't come on until the furnace warms up. There could be a short in the gas valve wiring, but I would be surprised if it blew a 3 amp fuse. Check it. Check anything else that feeds off the fuse that blows.
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