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    caud3298's Avatar
    caud3298 Posts: 1, Reputation: 1
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    #1

    Oct 5, 2014, 05:39 PM
    I installed Honeywell RTH2300/RTH221 in June. A/C worked fine. But heat doesn't wor
    I installed the Honeywell RTH2300/RTH221 in June. My A/C worked fine. I am now switching to heat and nothing happens when I change to heat. I followed instructions in my manual. Could there be a wire that I connected wrong?
    Missouri Bound's Avatar
    Missouri Bound Posts: 1,532, Reputation: 94
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    #2

    Oct 5, 2014, 08:03 PM
    You wired it wrong. Is this a heat pump installation? Are you sure it worked BEFORE you changed the t-stat? Did you turn off the power before you did the t-stat change?
    There could be literally a dozen reasons it doesn't work... call a professional before you get too cold.
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