Thermostat Wiring Colors Code Easy HVAC Wire Color Details 1 I have air forced Furnace that working with GAS first stage is heat pump (carrier 3k) and the 2th stage is furnace body change compressor of heat pump and thermostat. my system not working well in winter is very cold , it start with stage 1 and heat pump doesn’t warm the air there is no outdoor sensor questions are: Service Manuals - My RV Works Apr 10, 2020Category Manufacturer File Name Download component_category_hfilter manufacturer_hfilter; Air Conditioners: AirXcel - Coleman: Range/Stove/Oven Parts - Frigidaire Appliance Parts Range/Stove/Oven Parts - Shop online or call 888-343-4948. Fast shipping. Open 7 days a week. 365 day return policy.