is designed to withstand the extreme thermal cycling typical of modern heating systems

Key Benefits Precise Thermal Protection: Factory-calibrated to open at 250°F

Why is my blower fan running constantly but the furnace isn't heating

Universal Compatibility: Direct OEM replacement for Lennox 31J9601 and compatible with numerous Lennox-family brands

While this model is factory-configured for natural gas with a

Williams P271100 Flame Sensor is designed to withstand theThe Williams P271100 Flame Sensor is a critical OEM safety component engineered for precise flame rectification in Williams Forsaire counterflow furnaces. This sensor acts as the primary safeguard for the ignition sequence, utilizing a heat resistant probe to detect the presence of a burner flame. By communicating a microamp signal back to the integrated furnace control, it ensures that the gas valve remains energized only when a steady flame is