Official Rheem furnace parts

Common parts that can fail in Rheem furnaces

• Electronic control board. Many Rheem furnaces have an electronic control board that manages how the furnace works and prevents the furnace from starting in unsafe conditions. If the control board fails, the furnace may work poorly or not at all.
• Air filter. The furnace air filter cleans the air coming into the air handler through the return duct to protect the internal parts from any airborne contaminants and debris. If the air filter is clogged, air may not pass through the furnace efficiently, and the furnace may not work well. Follow the directions in the owner's manual to replace the air filter.
• Blower fan. The blower fan activates once the air inside the furnace or air handler has reached the appropriate temperature. The fan circulates air through the ductwork.
• Primary burner. The primary burner heats the air that the blower fan circulates through your home. If the primary burner on the furnace doesn't ignite, the furnace won't heat your home.
• Control thermostat. The control thermostat is attached to the wall in your home. The control thermostat senses the room temperature through a sensing bulb and cycles the furnace on and off to maintain the temperature you set.

Troubleshooting your Rheem furnace when it won't turn on

Check the house circuit breakers for the furnace. Reset the house circuit breakers for the furnace to restore power if you find the circuit breakers tripped.

Many Rheem furnaces have a cut-out switch next to the furnace that shuts off electrical power to the furnace. Make sure that the cut-off switch is turned on if your furnace has that switch.

Check the thermostat setting to make sure that the thermostat is set high enough to call for heat. Replace the thermostat if it's not working.