This typically indicates the bimetal switch inside the LH680003 has failed to toggle to the "hot" contact

and blower vacuum applications without the need for external power or manometer fluids

Electronically

This listing is for the replacement diaphragm only

Durable Construction: High-grade diaphragm material provides consistent performance under varying temperature and moisture conditions

Lochinvar & A.O. Smith 100271885 Probe 326010-701 This typically indicates the bimetalThe Lochinvar & A. O. Smith 100271885 Probe is a high precision upper temperature probe engineered for commercial water heaters and boilers. This OEM replacement part includes a robust integrated connector to ensure seamless electrical continuity and accurate resistance signaling to the control board. Designed specifically for high efficiency systems like the BTH series gas water heaters (including BTH 150 through BTH 500 models), this sensor monitors