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    Brian 2016's Avatar
    Brian 2016 Posts: 1, Reputation: 1
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    #1

    Feb 8, 2016, 11:53 AM
    Thermostat fuse blows when heat pump is turned on to heat mode only
    Heat pump won't work in heat mode... blows fuse in thermostat every time . A/C works fine. Disconnected white wire for heat at outside unit and did not blow fuse... wire shorted?? Please help
    Grady White's Avatar
    Grady White Posts: 1,417, Reputation: 59
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    #2

    Feb 11, 2016, 09:34 PM
    It certainly sounds like a shorted white wire. It's easy to find out by simply swapping the white for another color if there are any unused wires.
    The problem could also be a short outdoors in a wire only powered in the heating mode. One that comes to mind is maybe going to the reversing valve if the valve is 24v.
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