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

    Nov 17, 2011, 07:49 AM
    Trying to replace thermostat, but it doesn't have as many wires as the old one.
    I tried to change my thermostat for my Carrier 38YRA WeatherMaker Heat Pump, and the replacement thermostat didn't have enough wires, when I put the old one back on, it was blank.

    The R and C wires are hooked up. Is there a fuse I need to check?
    wmproop's Avatar
    wmproop Posts: 3,749, Reputation: 91
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    #2

    Nov 17, 2011, 08:23 AM
    If you didn`t turn off breaker to furnace before installing you might have blown the low voltage fues in the circuit board,, or maybe fried the transformer, you didn`t say what kind of furnace you have
    Electric furnaces (most) don`t have a low voltage fuse
    Cburyinc's Avatar
    Cburyinc Posts: 2, Reputation: 1
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    #3

    Nov 17, 2011, 09:38 AM
    Its an electric furnace. Breaker is not tripped
    wmproop's Avatar
    wmproop Posts: 3,749, Reputation: 91
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    #4

    Nov 17, 2011, 12:04 PM
    OK,, but you are supposed to trip breaker off, before installing a new tstat,, then turn back on.. the least little spark,that you can`t even sometimes will fry the transformer and has to be replaced

    Just hope it didn`t happen to you
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