Reznor 271994 Sensor 320819-301 or a failure to discharge

or a failure to discharge any liquid despite moisture in the tank

Versatile Application: Ideal for safety shutoff in industrial gas burners and low-pressure air service

This is the 3-tube heat exchanger assembly

Industrial Construction: Designed for high-reliability performance within commercial HVAC environments and control panels

or if the pilot stays lit after the call for heat is satisfied

Reznor 271994 Sensor 320819-301 or a failure to dischargeThe Reznor 271994 Averaging Temperature Sensor is a critical OEM replacement part engineered for precise thermal feedback in mixed air and cooling coil applications. Featuring a 36 inch length, this YD B type sensor is designed to mitigate the effects of stratified airflow by measuring the temperature across a wider cross section of the duct. This ensures the HVAC controller receives an accurate average reading rather than a localized "hot" or "cold"