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La a input for heat pump fault. I have tried to trace the wires and figure witch one goes to the new thermostat but with no luck. See the diagram below for what each wire controls on your system.
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Wiring diagram for honeywell rth connected to a ruud achiever answered by a verified hvac technician. Honeywell rth thermostats are designed to fit a variety of. Blue c red r green f orange o white. See the diagram below for what each wire controls on your system.