Williams P271100 Flame Sensor This direct OEM replacement ensures

This direct OEM replacement ensures robust electrical connectivity between the system controller and the compressor terminals

Sub-Panel Ready: Compact 50VA footprint fits efficiently into crowded control cabinets

the BKT287-1R follows standard 35mm top-hat DIN rail dimensions

the Williams 9A409 is the metal bracket only

Engineered for high-pressure hydronic and steam applications

Williams P271100 Flame Sensor This direct OEM replacement ensuresThe 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