Question about Honeywell Programmable Thermostat Heater

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I replaced my thermostat with a honeywell ct87n....it worked fine with the heat...I tried to turn it to the central air and nothing...turned on..not even my outside unit...any suggestions

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  • taa43 May 11, 2010

    If the indoor blower runs when put in to cool auto set point below room temp then their some thing up with the out side unit Circuit breaker tripped or it is not wired correctly y stat to y on furnace g on stat to g on furnace @ the t stat make sure you have RH & RC jumped together good luck Tom

  • Melissa Griever
    Melissa Griever May 20, 2014

    we have the same problem, blower and outside unit will not even come on...any suggestions?

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Is there a jumper between RC and RH. you may have wired the red wire to RH and may be missing the jumper to RC

Posted on Sep 12, 2009

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