I recently moved to a home which has 5-6 year Carrier 58MCB model heat pump (gas furnace). When stat mode is set to heat, cold air is coming from the vents even after I set temp 5 deg above the room temp , fan outside is moving and burner is the furnace is turned off. When I switch the mode to Emergency heat, hot air is coming through the vent and burner is On.
Do I need to change Thermostat? Can you help me to troubleshoot the problem.