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Disconnecting green wire from thermostate did allow furnace to run properly but every time I want to switch back to heatpump I must reconnect green wire again.Here is how wires are connected to themostate.Red to rcJumper wire from RC to RYellow to YBlack to COrange to OBGreen to GWhite to AugWires go toWhite to W on furnace control panelYellow to heatpumpGreen to heatpump and G on panelOrange to heatpump Black to heatpump and C on panelRed to heatpump and R on panelBlue,Brown,purple,gray and white wires not used at thermostate and also not used at heatpump.It shows in wiring guide that there should be a jumper between Aux and Eand that E sends output when set to Em.heat.Should one of these unused wires go from E to heatpump.I have tried to get installer to come back and fix it but no luck.thank you very much again.

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  • RAY TRUMAN Dec 10, 2008

    there is no RH on t-stat

  • RAY TRUMAN Dec 10, 2008

    had to disconnect green wire from g on t-state so that fan would not run constantly



  • dwkcool May 11, 2010

    is this a new t-stat

  • dwkcool May 11, 2010

    Does the t-stat have an Rh also beside Rc and yes it needs a jumper wire from AUX to E

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Try this.

A T-stat.

Orange = O
Red = R (with existing jumper)
Black = C
Yellow = Y
White =W1 (Or AUG)
Green =G

At airhandler/furnace.

Green = blower wire (usually green, double check with schematic)
(Green should not go to the HP.)
Orange to HP
Red to red and to HP
black to blue (or C) and to HP
White to W
Yellow to HP. (It may also go to a "float switch" if installed. but that will just be a safety switch on the drain pan in case the line clogs and it overflows.)

The green is typically used for the blower motor. (furnace only)

The orange is used for the reversing valve. (changes from AC to heat, is located in the HP only)

Blue is typically used for common (or "C") but they may have changed it to black due to a broken wire, or other problems.

The only wires going to the HP should be
Red
Blue/black
orange
yellow

Orange should not be going to the furnace at all.

HP wiring should be
Orange to orange or O
Red to R or red
Blue/black to blue or C
Yellow to Y

Posted on Dec 10, 2008

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