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I am replacing a white rodgers thermostat with a honeywell rth3100c. i have matched my wire as e (brown) to e w2 (white) o aux y (yellow) to y g (green) to g o (orange) to o l blank r (red) t r b blank c blank now i have a blue wire which was hooked up to the x1 on the old thermostat. where does this wire go?

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  • tdomiano Dec 02, 2008

    I have hooked the blue to the c......now i put it on heat and it takes about 5 minuts to kick the unit on.....when it kicks on it displays aux heat on the thermostat instead of heat on.

  • tdomiano Dec 03, 2008

    thermostat working.....blower went out......all is fixed now thanks so much for the help.

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Blue (C) or sometimes (B) should be your common wire. Look at your schematics and locate common. Your Brown wire is (E) and is emergency heat, white wire (W) is Auxilary Heat, green wire (G) is fan relay, red wire (R) is power, yellow wire (Y) is Cooling and orange wire (O) is reversing valve.

Posted on Dec 02, 2008

  • Armando Bernal Dec 02, 2008

    Do you have back up emergency heat? if so click your thermostat to emergency heat. Also the unit has a natural 5 min delay, it can be reconfigured on your therm schematics. Your therm may need to reconfigured.

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