Installed Honeywell thermostat, furnace inop
I replaced a mechanical Coleman Mach thermostat with a Honeywell non-programmable thermostat. I tested out the A/C a few weeks ago and it works fine, even with the toggle switch I added for the fan h...
Forum Discussion
Coleman Mach to Honeywell
Coleman
Red = +12vdc
Blue = -12vdc
Green = Fan High
Gray = Fan Low
White = Furnace
Yellow= Compressor
Honeywell
Red = +12vdc to RC/RH
Blue = -12vdc NOT USED
Green = Fan High
Gray = Fan Low
White = Furnace
Yellow= Compressor
Coleman
Red = +12vdc
Blue = -12vdc
Green = Fan High
Gray = Fan Low
White = Furnace
Yellow= Compressor
Honeywell
Red = +12vdc to RC/RH
Blue = -12vdc NOT USED
Green = Fan High
Gray = Fan Low
White = Furnace
Yellow= Compressor
