Furnace Displays Heat Pump mode when AC is running

Question

I have a new Trane S9X2 furnace I purchased this winter. I want to make sure that everything is setup correctly now in the cooling season. I noticed that the furnace displays "HP1" when the AC is running. According to the manual, this is "Stage 1 Heat Pump" mode. As far as I know, my AC unit does not function as a heat pump. I expected it to display "CL1" for First Stage Cooling.

The AC appears to be working fine. Cold air is being blown out the vents so I'm reluctant to call the service company to take a look.

Is this even an issue? Or is there some minor wiring issue with my thermostat? I have an EcoBee thermostat if that helps.

Thanks!

Ed Beal · Answer

The outside unit is a compressor , the difference between a heat pump in heating and cooling is the Direction of the refrigerant flow. So for a single fuel heat pump to cool it may well be running in stage 1 but a reversing valve has altered the flow. If you have a dual fuel system then in heating a choice is made based on the temp which one to run. Your thermostat probably doesn’t have all the functionality or was not fully programmed but to get cooling the outside unit needs to run and the reversing valves are set to cool. 
If it’s cooling everything is fine the thermostat is commanding the compressor on and it has the reversing valve in the correct position.

Furnace Displays Heat Pump mode when AC is running

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