Lochinvar & A.O. Smith 100208377 Pressure Switch 318973-401 Precision Engineering: The 1

Precision Engineering: The 1

For technicians performing furnace repair or routine heating system maintenance

making it ideal for large plenum applications where accurate temperature sensing is required

Pro-Grade Contact Material: Self-wiping silver alloy contacts ensure clean breaks and long-term conductivity in 120V circuits

Replacement intervals generally range from 3 to 6 months depending on local environmental factors and odor concentrations

Lochinvar & A.O. Smith 100208377 Pressure Switch 318973-401 Precision Engineering: The 1The Lochinvar & A. O. Smith 100208377 Pressure Switch is a critical safety component designed for precise combustion blower monitoring in high efficiency condensing water heaters and boilers. This OEM pressure switch kit is factory calibrated to a 3. 00" WC (Water Column) set point, ensuring the integrated control board verifies proper venting and inducer fan performance before allowing the ignition sequence to proceed. It is a direct replacement for