Lochinvar & A.O. Smith 100110771 Ignition Assembly

The Lochinvar & A.O. Smith 100110771 Ignition Assembly is a specialized HSI/flame sensor assembly engineered for high-efficiency commercial and residential water heating systems. As a veteran-grade OEM replacement part, this unit serves as the updated version for 9005958 (and 9005958005), featuring a hot surface ignitor and an integrated flame sensor on a single mounting bracket to ensure precise flame rectification and reliable ignition cycles. Designed specifically for Lochinvar Knight and A.O. Smith Cyclone series, including popular models like the BTH-150A and BTH-400A, this assembly addresses common flame failure lockouts and ignition failure error codes. The 120V silicon carbide or nitride element provides rapid heat-up for efficient gas ignition, while the sensor rod monitors the burner flame to satisfy the safety control board requirements. When your power vent water heater or modulating boiler experiences intermittent startup issues, replacing the worn 100110771 igniter kit is the standard protocol to restore factory-spec performance. This genuine Hot Surface Ignition (HSI) component is essential for maintaining the tight combustion tolerances required by FVIR-compliant systems.

• Direct OEM Fit: Drop-in updated version for 9005958 eliminates the need for field modifications or bracket drilling in Lochinvar and A.O. Smith units.
• Integrated Dual-Function: Combines the hot surface ignitor and flame sensor into one HSI/flame sensor assembly for faster diagnostic and installation times.
• Reduced Error Codes: Specifically engineered to resolve 3-flash (flame failure) and 4-flash (igniter failure) lockout sequences on Honeywell and Lochinvar integrated controls.
• High-Temperature Durability: Thermal-shock resistant materials ensure reliable rectification signals even under high-cycling commercial demands.
• Broad Compatibility: Supports a wide range of Cyclone, Genesis, and Knight models, including GPVH-40/50 residential power vent heaters.

• How do I confirm if my 100110771 igniter is faulty? Use a true RMS multimeter to check for continuity; an open circuit or resistance exceeding factory ohms generally indicates a cracked element. Also, check for 4-flash error codes on the status LED.
• Does this assembly include the gasket? Most 100110771 kits include the necessary silicone or graphite burner door gasket, which should always be replaced during HSI assembly service to prevent combustion gas leaks.
• What causes premature failure of the HSI? Excessive ohm resistance due to age is common, but carbon soot buildup or grounding issues can also lead to weak flame sensing signals and subsequent system lockouts.

Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.