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These markings confirm it meets the boiler safety equipment requirements found in most North American mechanical codes for high-pressure hydronic systems
visible cracks on the element
ensuring the circuit interrupts before thermal damage occurs
Verified for electrical compatibility across various residential gas furnaces and heat pump systems
Lennox 33F37 Flame Sensor Els PW 17895 These markings confirm it meetsThe Lennox 33F37 Flame Sensor is a critical OEM replacement part engineered to maintain the safety and operational sequence of residential gas furnaces. As an HVAC flame rectification probe, it generates a microamp signal to the furnace control board upon detecting heat, ensuring the gas valve remains open only when a pilot or burner flame is present. This high integrity sensor is functionally identical to part 33F3701 and serves as a direct
