Lochinvar & A.O. Smith 100111255 Control Board 321894-708 ensuring accurate water level sensing

ensuring accurate water level sensing and system response

The NEMA 4X rating specifically indicates resistance to corrosion and hose-directed water

Look for a bulging top

You can test the sensor using a multimeter to check for continuity or specific resistance values

Lochinvar & A.O. Smith 100111255 Control Board 321894-708 ensuring accurate water level sensingThe Lochinvar & A. O. Smith 100111255 Control Board is a critical OEM replacement part designed for high performance commercial water heaters and hydronic heating systems. As a central control board, it manages vital system diagnostics, ignition sequences, and multi stage temperature regulation to ensure peak operational safety. This HVAC control module is the direct replacement for obsolete part number 9006520005, engineered to restore factory spec