Lochinvar & A.O. Smith 100109151 Switch 326058-758 If your heater is short-cycling

If your heater is short-cycling or the control board flashes a code indicating a limit trip

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

While designed by Honeywell

Always verify your specific wiring diagram to ensure the ignitor voltage matches the module's output capability

Reduces wear on compressor motor windings by managing high-torque startup sequences effectively

Lochinvar & A.O. Smith 100109151 Switch 326058-758 If your heater is short-cyclingThe 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,