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  1. JimboTJ

    Help with Thermostat COMM wiring

    Hey all. I have a single zone Dometic thermostat that is flashing E1 when trying to run the heater. I know this is a wiring or communications issue between the thermostat and the furnace, but I have no idea where the COMM wire runs to. I assume it runs to a board that controls the AC and...
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