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    KISS's Avatar
    KISS Posts: 12,510, Reputation: 839
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    #101

    May 17, 2009, 07:24 AM

    Here is a 4 heat/2 cool stat.

    Buy Honeywell VisionPro IAQ Programmable Universal Thermostat with Total Home Comfort Control | Honeywell YTH9421C1002

    I need to look at it a bit more.
    KISS's Avatar
    KISS Posts: 12,510, Reputation: 839
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    #102

    May 17, 2009, 09:00 PM

    Got some advice. Best one can tell there are 4 stages of heat.

    You might consider jumping W1 to W2 to W3 assuming you have a 2 stage heating stat. From my advice, the air handler will sequence stage if the thermostat doesn't. It might provide better recovery on cold days.
    sgtaxe's Avatar
    sgtaxe Posts: 4, Reputation: 1
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    #103

    Jul 21, 2010, 07:47 PM
    I have a similar setup and problem. My question is: if there is no 24 VAC between R & C. the fuse is good, and there are no loose wire or connections that I have found. Is it most likely the board that is blown?

    I have no fan when I switch tstat to fan on, and of course no a/c at all.

    Thanks
    Sgtaxe


    Quote Originally Posted by KeepItSimpleStupid View Post
    This reads well. Kinda interesting reading.

    I'd focus your immediate attention on the following two terminals. R & C.

    The next time it fails check R & C at the furnace first and R & C at the thermostat. There should be 25 VAC between these terminals at all times.

    Those two terminals should go to the transformer in the air handler. There should be 4 terminals or wires. Two go to 120 VAC and two go to R &C.

    Look for any loose connections in any of these wires.

    There also may be a 3 A automotive type fuse on the control board. Re-seat that.

    You need 24 VAC between R & C for the tstat to have power.
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