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For technicians performing furnace repair or routine heating system maintenance
Replacement intervals generally range from 3 to 6 months depending on local environmental factors and odor concentrations
Pro-Grade Contact Material: Self-wiping silver alloy contacts ensure clean breaks and long-term conductivity in 120V circuits
Built to withstand operating temperatures from -40°F upward
making it ideal for large plenum applications where accurate temperature sensing is required
Lochinvar & A.O. Smith 100208377 Pressure Switch 318973-401 For technicians performing furnace repairThe 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
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