| Seems you have a heat pump system, and the Honeywell RTH230B will not control a heat pump system.
You will need to open the heat pump control panel, find the wiring diagram, make note of the stages of cooling, aux heat, reversing valves, and emergency heat, that may exist and find a thermostat compatible with your unit.
See if you can find the website for the manufacturer of your unit, there they may tell you which stat you need. |