Lochinvar & A.O. Smith 100110487 Flame Prover

The Lochinvar & A.O. Smith 100110487 Flame Prover is a mission-critical component designed to maintain the safety and integrity of commercial combustion systems. Engineered for high-temperature precision, this flame sensor replacement utilizes flame rectification technology to monitor the burner's ionized gas path. This part ensures the HVAC control board receives a steady DC microamp signal (typically a minimum of 1.0 µA), preventing hazardous gas buildup by signaling an immediate system lockout if the flame is not detected. This specific OEM heating part is a direct replacement for legacy part number 9005476115 and is fully compatible with specialized Lochinvar and A.O. Smith high-efficiency water heaters and boilers. For the seasoned technician, this flame prover kit is essential for resolving common ignition failure codes and intermittent "low flame signal" faults. Proper installation ensures the burner maintains its radial fire efficiency without the risk of nuisance shutdowns caused by sensor degradation or carbon fouling.

• Precision Flame Detection: Capable of sensing minute DC microamp fluctuations to ensure reliable pilot burner verification.
• Direct OEM Compatibility: Specifically engineered to interface with Lochinvar Smart System controls and A.O. Smith gas valves.
• Rugged Construction: Designed to withstand extreme thermal cycling within the combustion chamber without signal drift.
• Enhanced System Safety: Facilitates rapid ignition trial shutdowns if ignition fails, protecting the unit and the facility.

What causes a "Low Flame Signal" error on Lochinvar units?
This is frequently caused by carbon buildup or oxidation on the flame prover surface, which increases electrical resistance and drops the signal below the required 1.0 µA threshold.

Is the 100110487 a direct replacement for part 9005476115?
Yes, this current part number is the official replacement for the older 9005476115 assembly found in many commercial power vent models.

How can I troubleshoot a faulty flame sensor?
Technicians should use a digital manometer and a multimeter to check the microamp signal between the flame sensor and the control module during the ignition cycle.

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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.