OEM Reliability: Genuine Johnson Controls part ensures dimensional accuracy and material performance

the 21-038 provides a constant pilot air supply

This 270 degree furnace switch functions as a NC (normally closed) limit that opens when excessive heat is detected outside the combustion chamber

The Heil Quaker ICP 1008676 Collector Box Gasket is a critical OEM sealing component required for maintaining the pressure integrity of the condensing furnace secondary heat exchanger

Lennox 21L99 Flame Sensor OEM Reliability: Genuine Johnson ControlsProfessional grade Lennox 21L99 Flame Sensor is a critical OEM replacement part designed to maintain pilot and burner safety through precise flame rectification. As a veteran preferred component, this sensor is engineered to monitor the furnace flame and provide the necessary DC microamp signal to the control board, ensuring the gas valve remains energized only when a safe ignition is confirmed. It serves as a direct OEM replacement for the Lennox