Lochinvar & A.O. Smith 100109151 Switch 326058-758 or a capacitance reading outside

or a capacitance reading outside the ±5% or ±10% tolerance range during professional testing

When replacing the pilot assembly

leak-free solder joints

The unit’s small footprint and single-gang back box mounting make it ideal for aesthetically sensitive installations where a low-profile gas/smoke detection accessory is preferred

Confirm that your unit uses Hot Surface Ignition and cross-reference the serial number to ensure it was manufactured prior to the 2007 transition to newer control layouts

Lochinvar & A.O. Smith 100109151 Switch 326058-758 or a capacitance reading outsideThe Lochinvar & A. O. Smith 100109151 is a critical safety component designed for high efficiency BTH (Best Tankless Hybrid) water heaters and commercial boilers. This Low Gas Pressure Switch is factory calibrated to a 5" WC (Water Column) set point, serving as a primary sentry to ensure safe combustion cycles. In the field, this switch monitors the incoming gas supply pressure to prevent the burner from firing under insufficient pressure conditions,