Lochinvar & A.O. Smith 100109721 Upper Probe 320074-702 Pressure switches are safety devices

Pressure switches are safety devices

Inspect the board for visible heat damage or "brown scoring" on the relay components

providing a drop-in solution for contractors servicing legacy equipment

Integrating high-voltage terminal strips and low-voltage thermostat connections

Lochinvar & A.O. Smith 100109721 Upper Probe 320074-702 Pressure switches are safety devicesThe Lochinvar & A. O. Smith 100109721 Upper Probe is a critical OEM replacement part engineered for the inner control assembly of high efficiency commercial water heaters. As a high performance hot surface igniter, this 100109721 probe is essential for ensuring reliable ignition cycles and precise flame sensing in BTH Series units. Designed to meet exact factory specifications, it eliminates the common failure points associated with generic