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My old thermstat has only two wires how can i connect it to RTH8500 honeywell thrmostat

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  • Purgatory Dec 03, 2008

    my old thermstat has only two wires how can i connect it to RTH8500 honeywell thrmostat

    Same issue with the RTH8500,
    I have a forced air gas furnace and only two wires going from the unit to the old thermostat. (don't rightly know what colors they are as the wiring from the furnace to the thermostat was a hack job splicing 3 different lengths of wire together)




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