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    toddhoppe's Avatar
    toddhoppe Posts: 3, Reputation: 1
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    #1

    Apr 26, 2010, 05:20 PM
    heat but no ac
    I replaced my thermostat, when I turned the power on ,nothing . I found I hs=ad blown a 3 amp fuse by the transformer because I wired the thermostat wrong. The heat now works but not the ac, is there another fuse for that . It's a york model p3huc20n09201c
    Joshdta's Avatar
    Joshdta Posts: 2,549, Reputation: 45
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    #2

    Apr 26, 2010, 06:05 PM

    No there is no other fuse. Do you have a jumper from rh to rc??
    toddhoppe's Avatar
    toddhoppe Posts: 3, Reputation: 1
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    #3

    Apr 26, 2010, 06:30 PM

    no my last therm had w=w, r=r, y=y, g=g , blue=c, I didn't think I needed the jumper because the old one didn't, 'do I '?
    Joshdta's Avatar
    Joshdta Posts: 2,549, Reputation: 45
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    #4

    Apr 26, 2010, 06:34 PM

    If there is no red wire on rc you will not send power to the ac unit. So a jumper must be installed if your new stat has both a rh and rc. I think this will take care of your problem. Make sure to turn off power on furnace before installing the jumper.
    wmproop's Avatar
    wmproop Posts: 3,749, Reputation: 91
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    #5

    Apr 26, 2010, 06:44 PM
    Quote Originally Posted by toddhoppe View Post
    i replaced my thermostat, when i turned the power on ,nothing . i found i hs=ad blown a 3 amp fuse by the transformer because i wired the thermostat wrong. the heat now works but not the ac, is there another fuse for that . its a york model p3huc20n09201c
    You/everyone should always kill the power to furnace before installing new tstat or doing anything to the low voltage wiring / or high voltage wires
    toddhoppe's Avatar
    toddhoppe Posts: 3, Reputation: 1
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    #6

    Apr 27, 2010, 11:23 AM

    thanks joshdta, I jumped rc=rh and it works, just in time for so-cal heat!
    Joshdta's Avatar
    Joshdta Posts: 2,549, Reputation: 45
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    #7

    Apr 27, 2010, 12:42 PM

    Great glad it is working for you
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