Official Craftsman furnace parts

How to fix your Craftsman furnace when it won't heat

• Check the gas supply cut-off valve to make sure it's fully open. Open the valve if you find it shut.
• Check the thermostat setting. Turn the temperature dial on the thermostat to a position calling for heat to see if the thermostat works. Replace the thermostat if it doesn't turn on the furnace.
• Make sure the pilot burner is lit. Follow the instructions in your Trane owner's manual for lighting the pilot. Replace the pilot if it won't stay lit.
• Shut off the gas supply and check the burner orifice. Clean the burner orifice if it's clogged.
• Shut off electrical power to the furnace and check wiring connections on the thermostat, pilot light and gas valve connections. Reconnect any loose wires and repair any broken wires.
• Replace the gas valve if it doesn't open to ignite the burner.

Common Craftsman furnace parts that sometimes need to be replaced

• Heating element. Electric furnaces use a coil heating element to heat the air in your home. When a coil inside the heating element breaks, the furnace won't heat and a house circuit breaker will trip if the broken element coil shorts to metal inside the furnace.
• Gas control valve. The gas control valve supplies gas to the burner when safety sensors indicate that it's safe to ignite the burner.
• Wall control thermostat. The wall control thermostat detects the temperature inside your home and cycles the furnace on and off to maintain the set temperature.
• Air filter. The furnace air filter removes dust and other particles from the air circulating through your home as the furnace runs.