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Programmable Thermostat Installed – Heat But No Ac?

Nov 22nd, 2009 by Thermo

My dad installed a programmable thermostat for me last fall. It worked great for heating but now it says the AC is on but it’s not. I asked this yesterday, someone suggested the switch on the furnace which I did but that was just the furnace fan. Any other solutions?

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This entry was posted on Sunday, November 22nd, 2009 at 8:28 pm and is filed under Thermostats. You can follow any responses to this entry through the RSS 2.0 feed.

4 Responses to “Programmable Thermostat Installed – Heat But No Ac?”

  1. Shine!
    November 22, 2009 at 8:46 pm

    I had the same problem a while back. I accidentally miswired it. The heater worked fine but the AC didn’t turn on even thought the thermostat said it was on. Have your father check the terminal connections on the rear of the thermostat. Sometimes the labeling on the terminals can be misleading. My system has a control voltage of 12v DC so there was no damage done.

  2. badbende
    November 22, 2009 at 8:51 pm

    If there is an RC and RH terminal, they should be jumpered together with the red wire.
    Just add another piece of wire to connect both terminals together.

  3. gizmoe
    November 22, 2009 at 9:41 pm

    Check the wiring on the thermostat
    be sure that it is set right
    HAVE A PRO LOOK AT IT

  4. eddie
    November 22, 2009 at 10:13 pm

    the wiring is messed up

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