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OK, I'm getting 13V AC at the transformer output. Can we assume the transformer is bad? Randy

Is there a component that will go out between the transformer input and the 120V? Randy

The thermostat is easier to check first. The most voltage I could find was 3V AC. Randy

The furnace is a Janitrol AC30-10, SN 9412014 74 I know my way around a VOM meter, so tell me what's next. Randy

During the winter, I noticed a loud hum coming from my furnace at all times. The other day, I tried to turn on the AC and got no response. Checked the furnace room, and found the noise is gone. No response at all from the thermostat, either heat or AC. Checked power, and there is power at the...