Reference the LED diagnostic light on the board surface

The Nordyne 151888R Orifice is a high-precision HVAC replacement part designed specifically for gas furnace inducer assembly applications

It is specifically designed to work with the Honeywell S8610U and related intermittent pilot controls

Durable Construction: Heavy-duty copper capillary resists corrosion and fatigue in high-heat zones

For Series 93 models

Lochinvar & A.O. Smith 100109151 Switch 319852-301 Reference the LED diagnostic lightThe 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,