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    jwlusby's Avatar
    jwlusby Posts: 3, Reputation: 1
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    #1

    May 16, 2011, 02:56 PM
    Heat working, A/C not
    I have a Lennox Model #G12Q3-110-1 and the heat works but the a/c doesn't. Last winter nothing was coming on and I found that the transformer looked bad and burnt. I replace the transformer the heat worked but the a/c still doesn't. Any suggestions?
    KC13's Avatar
    KC13 Posts: 2,556, Reputation: 99
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    #2

    May 16, 2011, 05:55 PM

    Do you mean the outdoor unit doesn't run? If so, start by checking the fuses and/or circuit breaker for the outdoor unit. There may be fuses in the outdoor disconnect, if present.
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    jwlusby's Avatar
    jwlusby Posts: 3, Reputation: 1
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    #3

    May 17, 2011, 05:11 AM
    [QUOTE=KC13;2802136]Do you mean the outdoor unit doesn't run? If so, start by checking the fuses and/or circuit breaker for the outdoor unit. There may be fuses in the outdoor disconnect, if present.[/QUOTE

    Neither the outside or inside unit comes on... the fan won't even come on when I switch the thermostat to "ON" from "AUTO". Any help?
    KC13's Avatar
    KC13 Posts: 2,556, Reputation: 99
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    #4

    May 18, 2011, 03:43 AM

    Sounds like there is a short or shunt in the control circuit to the outdoor unit. The transformer you previously replaced may have been overloaded and failed when you switched on the a/c for the first time this season. Check the low-voltage wire to the outdoor unit for damage & check the contactor coil for a shunted or shorted condition.
    jwlusby's Avatar
    jwlusby Posts: 3, Reputation: 1
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    #5

    May 18, 2011, 04:00 PM
    Quote Originally Posted by KC13 View Post
    Sounds like there is a short or shunt in the control circuit to the outdoor unit. The transformer you previously replaced may have been overloaded and failed when you switched on the a/c for the first time this season. Check the low-voltage wire to the outdoor unit for damage & check the contactor coil for a shunted or shorted condition.
    Would that cause the indoor fan motor not to run when I switch the thermostat from "Auto" to "On"?
    KC13's Avatar
    KC13 Posts: 2,556, Reputation: 99
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    #6

    May 18, 2011, 07:35 PM

    If the transformer failed again, the system would have no control power. Re-read my last post.

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