verify if your existing AS31XH280 clip is salvageable or if a new one is required for the install

0 ohms (continuity) across the terminals because this is a normally closed (NC) safety device

you must physically depress the reset button on the back of the switch after resolving the airflow issue

The Watts 0881427 (GB-C) is a professional-grade high-temperature gasket kit engineered for 1-inch dielectric unions

The 1053017 typically refers to the knob itself

Lochinvar & A.O. Smith 100208552 Temp Sensor verify if your existing AS31XH280The Lochinvar & A. O. Smith 100208552 Water Temperature Sensor is a critical NTC thermistor designed for high accuracy thermal monitoring in commercial and residential hydronic systems. This OEM replacement part, also identified by cross reference numbers TST2032, TST2032K, and 100274731, provides the precise resistance to temperature feedback required by the system's control board to manage firing rates and maintain setpoint stability. Featuring an