Looking for the wiring match-up to replace my existing thermostat 51H4301 to a Honeywell RTH7600 unit. My outside unit HP21-511-4P and the inside unit is CB19-51-3P-TXV. The current wiring for the thermostat is: O G C R T W1 - two tied together on one screw Y1

I currently have a Honeywell T841A1217 and want to install an RTH7600. The wiring labels are different. T841A1217 has W2,X,O,E,G,Y,R. The RTH7600 has C,G,Y,O/B,RC,R,AUX,E,L. The RTH7600 also has C,G,Y,W,RC,R,W2,Y2. I have a 2.5 ton Carrier Heat Pump.

I have a honeywell RTH7600 thermostat. The inside temperature on the termostat says it is 4 degrees higher than the room actually is. It says it is 78 degrees and it is actually 74 degrees. Is there a way to calibrate the thermostat to show the true temperature?

Ducane furnace with ST9160B control card : I have a Smart Valve (SV9520H) that seems to pass all tests and shows nothing is wrong (according to indicator flashes) Hot surface Ignitor glows, valve solanoid clicks to allow gas to come out but nothing comes. I disconnected Gas and tried to blow...

Hi, I successfully installed the RTH7600 on my 2 wire Weil McLain, hot water, cold start, gas fired system. I then tried to enable the battery free function by running the system common wire (C on the 28vac transformer) to the "C" terminal on the thermostat. This did not work. Should the common go...