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    Donsox's Avatar
    Donsox Posts: 3, Reputation: 1
    New Member
    		  
    #1

    Feb 12, 2006, 05:39 PM
    AC/Heating unit will not come on
    I attempted to replace an old York programmable thermostat with a Hunter thermostat. After installing the Hunter thermostat, my unit will now not come on. I checked the circuit breaker and it is on. What else do I need to check? Please tell me that I didn't blow my unit. Any help or suggestions would be greatly appreciated. THANKS!
    letmetellu's Avatar
    letmetellu Posts: 3,151, Reputation: 317
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    #2

    Feb 12, 2006, 10:21 PM
    It would help to know what the thermostat operates, is it a furnace, an airconditioner or both. Is it a heat pump and if so it is all electric or does it have an alternative fuel.
    Donsox's Avatar
    Donsox Posts: 3, Reputation: 1
    New Member
    		  
    #3

    Feb 13, 2006, 06:44 AM
    It operates both the AC and heat. It is electric.
    Dr D's Avatar
    Dr D Posts: 698, Reputation: 127
    Senior Member
    		  
    #4

    Feb 13, 2006, 10:30 AM
    You have probably miswired the new thermostat. Double check the wiring diagram. I had a similar problem when installing a new Honeywell thermostat on a heat pump. Labman, the thermostat guru of this site, led me to find that I had fried the 24 volt transformer in the HP through my mistakes. A new transformer cost me about $11. Check to see if you are getting 24 volts from the red wire from the HP. Good luck.
    Donsox's Avatar
    Donsox Posts: 3, Reputation: 1
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    #5

    Feb 13, 2006, 11:36 AM
    THANK YOU!! That is a relief!! I will check the transformer and red wire.
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