I have a Carrier Heat Pump system with a FV4BNF005 air handler.
I just replaced the thermostat with a Carrier TP-PRH01-A. The previous model More thermostat was a Carrier TSTATCCPRH01-B. With the previous model thermostat the air handler's variable speed fan would run in high speed most of the time. With the new thermostat, the air handler's variable speed fan does not run at the higher speed, at least not yet. I have only had the thermostat installed for a few hours. I have checked and double-checked the wiring from the air handler to/from the new thermostat and I have compared the wiring to the way the old thermostat was wired. Everything appears to be wired correctly. What ideas and suggestions do you have? Any and all ideas would be greatly appreciated.