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    ToddMic's Avatar
    ToddMic Posts: 1, Reputation: 1
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    #1

    Aug 30, 2009, 06:09 PM
    Everything but the AC & Fan turns on
    Hey people - I'm having a problem with my A/C unit. Pretty new unit and the thermostat checks out fine as it worked fine on my other A/C unit - it was the thermostat given with unit and I haven't messed with any of the wiring.

    Here is the deal - the heat will turn on (gas) and the fan will run. I can set the fan to on and it runs fine. When I set to A/C - nothing happens. No fan, no outside compressor, and no little "click" sound that turns on either.

    Is it the relay?
    HVACtechsnj's Avatar
    HVACtechsnj Posts: 11, Reputation: 2
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    #2

    Aug 30, 2009, 08:09 PM

    Look at the first thread on this board in ref to the terminals. If the stat has an Rh and Rc and there is only one R wire to the stat the two terminals need to be jumped. Also at the unit make sure one low voltage wire from the outside unit is on C and the other is on the Y terminal along with the same color from the stat also on the Y terminal.
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