Carrier Infinity thermostat locking out gas heat on service codes 13 and 33 Furnace inspection found locked out flame roll out switch on the right hand side of the direct vent enclosed burner box After reset and run testing rotten burners were found to be the cause of an overheated burner box. The fire is not going into the heat exchanger tubes as it should Replace all four burners and shop vac equipment. Shop-Vac and clean upper portion of heat exchanger. Run test gas heat at 121 Run test heat pump and found no condenser fan operation Install replacement 45 + 5 dual run capacitor 440 volt power supply Infiniti heat pump test supply temperature 101