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    m4rkl1sa's Avatar
    m4rkl1sa Posts: 6, Reputation: 1
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    #1

    Dec 13, 2008, 05:01 AM
    Didn't label wires when replacing thermostat
    HELP!

    I replaced my old thermostat with a new digital HOneywell one, but I did not label the wires, I thought I had done everything correctly in reconnecting them, but now I have no heat. The fan runs, but no heat is coming out - as if the unit THINKS it is heating, but the air coming out is cold.
    I am pretty sure that I wired somehitng wrong - how can I fix it?
    hvac1000's Avatar
    hvac1000 Posts: 14,540, Reputation: 435
    Heating & Air Conditioning Expert
    		  
    #2

    Dec 13, 2008, 05:46 AM
    Try supplying more info to start with.
    Old thermostat brand and exact model number
    New thermostst brand and exact model number.

    Colors of wires used might also help.
    m4rkl1sa's Avatar
    m4rkl1sa Posts: 6, Reputation: 1
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    #3

    Dec 13, 2008, 05:55 AM
    the old one - Rheem
    new one - honeywell

    Wires - brown (which was attached to x - I did write that down)
    grey (attached to b)
    red
    green
    yellow
    white(ish)

    the color coded oones are in the right places y to tellow, g to green, r to red. The white(ish) is attached to aux and the brown to e and the grey to b
    m4rkl1sa's Avatar
    m4rkl1sa Posts: 6, Reputation: 1
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    #4

    Dec 13, 2008, 06:12 AM

    Also - the instructions in the manual say"if the old thermostat had W1, W2, and Ywires, contact a heating contractor for help -

    Oops. I usually read all instructions - would have helped this time -
    hvacservicetech_07's Avatar
    hvacservicetech_07 Posts: 1,083, Reputation: 75
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    #5

    Dec 13, 2008, 08:54 AM

    What type of system is this? Heat pump?
    m4rkl1sa's Avatar
    m4rkl1sa Posts: 6, Reputation: 1
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    #6

    Dec 13, 2008, 09:18 AM

    YEs - it is a heat pump with aux heat and emerg heat
    hvac1000's Avatar
    hvac1000 Posts: 14,540, Reputation: 435
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    #7

    Dec 13, 2008, 09:28 AM
    Try supplying more info to start with.
    Old thermostat brand and exact model number
    New thermostst brand and exact model number.


    Exact model numbers??
    hvacservicetech_07's Avatar
    hvacservicetech_07 Posts: 1,083, Reputation: 75
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    #8

    Dec 13, 2008, 09:28 AM

    I think the brown should be hooked to a common terminal. Install a jumper wire between aux. and e. Is there an x or c terminal on the new stat?
    m4rkl1sa's Avatar
    m4rkl1sa Posts: 6, Reputation: 1
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    #9

    Dec 13, 2008, 09:36 AM

    Old thermostat number - lr1620
    New therm # rth3100c

    Yes - the brwon wire is hooked to the c
    hvacservicetech_07's Avatar
    hvacservicetech_07 Posts: 1,083, Reputation: 75
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    #10

    Dec 13, 2008, 09:46 AM

    Ok, list all the terminals on the new stat and what they are hooked to.
    m4rkl1sa's Avatar
    m4rkl1sa Posts: 6, Reputation: 1
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    #11

    Dec 13, 2008, 10:34 AM

    Got it - the transformer blew - the HVAC guy is here now -

    I feel so stupid!
    hvacservicetech_07's Avatar
    hvacservicetech_07 Posts: 1,083, Reputation: 75
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    #12

    Dec 13, 2008, 10:36 AM

    You didn't shut the power off to the system before replacing the t-stat, eh? Still kind of strange that the blower was running.
    hvac1000's Avatar
    hvac1000 Posts: 14,540, Reputation: 435
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    #13

    Dec 13, 2008, 10:50 AM
    Try Brown goes to Common (C) and White is jumped to E and Aux. Try at your own risk.

    If not follow all the wires to the indoor air handler and post what color wires goes to what terminal on the air handler.


    http://hvactroubleshooters.com/HONEY...%20INSTALL.pdf

    Your instructructions after you find out exactly what color wire goes to what terminal.
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