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

    Mar 8, 2010, 04:53 AM
    What causes a motor start/run capacitor to continue to fail?
    The blower motor on my furnace would not start, it hummed. I tried to spin it to get it going but the motor was locked up (electrically, with no power it spins free). I heard that if you have a bad capacitor you can get the fan going with a spin - this is not the case here, as I said the motor seems to be electrically braking. I replaced the capacitor (not sure if it is a run or start) and the motor started. It ran for a couple days then quit again. I replaced the capacitor again and for another three days it seemed OK.
    Missouri Bound's Avatar
    Missouri Bound Posts: 1,532, Reputation: 94
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    #2

    Mar 8, 2010, 07:09 PM
    When a motor fails, it often makes the capacitor fail as well. Can you do an amperage check on the motor when it is running?
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