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Would that cause the indoor fan motor not to run when I switch the thermostat from "Auto" to "On"?

[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...

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...