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I have an existing Honeywell non-programmable thermostat with 2 wires, a white and black. I 'd like to replace with the RTH230B programmable. After reading the Reader's Digest Do-it-Yourself book, it says I would need to add wires if I wanted to replace a non-programmable thermostat with a...
Question of wiring Honeywell RTH230B thermostat
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Hi, I bought a Honeywell programmable thermostat to replace my old thermostat that controls both hotwater furnace and central AC. There are 5 wires now connected to the old thermostat, red, black, yellow , green and white. In my new Honeywell thermostat, there are also five slots as follow: Rh:... View more questions Search
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