This kit includes the critical internal components—specifically the D-4460 seat disc

The alphanumeric lettering identification on the exterior ensures field technicians can quickly verify the model’s 135°F/57°C rating and FX/ROR activation method

often accompanied by specific error codes on the unit's control display

80-ohm cold resistance to help neutralize the galvanic reaction between the tank and the heating element

ensuring a consistent spark for intermittent pilot ignition systems

Lochinvar & A.O. Smith 100165921 Flame Sensor Els PW 17895 This kit includes the criticalThe Lochinvar & A. O. Smith 100165921 Flame Sensor is a critical OEM replacement part engineered for precise flame rectification in high efficiency gas fired systems. Designed as a direct crossover for the PLT30001 flame sensor, this component monitors the burner's ionization signal to ensure safe and continuous combustion. If your boiler or water heater is experiencing intermittent flame ignition failure or short cycling, a fouled or oxidized flame