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    dowbs's Avatar
    dowbs Posts: 2, Reputation: 1
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    #1

    Dec 6, 2010, 03:59 PM
    5amp fuse blowing in carrier air handler
    I worked on this unit for the last few days. I came in and replaced a blown fuse. Unit ran for a day. Now the fuse blows instantly as soon as power goes to unit on both cooling and heating. I disconnected ever wire but the c to the t stat then when I try to add the are power wire it blows the fuse instantly. I can't find any evidence of damage to any of the wires in the air handler. I ran new t-stat to the thermostat but didn't help. Tried to put in a new circuit board and transformer and no help. I am out of ideas I have changed everything on the low voltage side in the airhandler I can think of.
    Stratmando's Avatar
    Stratmando Posts: 11,188, Reputation: 508
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    #2

    Dec 6, 2010, 04:11 PM

    If the Blower motor relay coil was shorted, it could do this as it is common to both heating and cooling.
    dowbs's Avatar
    dowbs Posts: 2, Reputation: 1
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    #3

    Dec 6, 2010, 04:17 PM
    I was tripping the fuse with the g wire disconnected from the circiut would that still cause it to blow with no signal to the fan to run?
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