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I have a honeywell tstat RTH2310B that we hooked up recently to use with an internal gas furnace and an external a/c unit. It was working fine with the a/c now it is time to use it with the heater and there is something wrong. When switched over to heat we have to turn the temperature setting below the current temperature reading to get the heater to turn on, which means the heather will constantly run until we turn the unit off. I have checked the wires coming out of the furnace and they all match the color of the wires that are plugged into the thermostat, there is a jumper between the Rh/Rc with the red wire hooked into there;the other wires connected are W,Y and G. There is also a blue wire that isn't connected to anything and tucked back in the hole behind the thermostat. I have tried some of the posted solutions I could find here and have had no luck so now I am looking for help.

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Posted on Nov 28, 2010

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You might try disconnect Rc and Rh by removing jumper wire. reconnect red wire to Rh and see what happens.Good luck. Thanks

Posted on Nov 08, 2010

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