The Reznor 222771 Flame Sensor is a critical OEM replacement component engineered for precise flame rectification in industrial and commercial gas-fired heating systems. Designed for heavy-duty HVAC replacement parts inventories, this sensor monitors the burner's ionized path to confirm ignition, preventing dangerous unburned gas buildup. As a veteran-grade Reznor flame sensor, it features a high-grade rod on a durable porcelain insulator, built to withstand the rigorous furnace maintenance cycles of unit heaters like the RDCB and FE series. When your unit experiences a "three-second shutdown," replacing the worn or oxidized sensor with this authentic gas furnace repair part restores the microamp signal to the control board, ensuring reliable combustion and system safety. This direct replacement flame sensor eliminates the frequent lockouts caused by carbon soot or cracked insulators, maintaining optimal performance in warehouses, manufacturing plants, and high-demand commercial environments. Key Benefits OEM Precision: Genuine Reznor replacement ensures exact fit and mounting alignment for effective flame detection. Enhanced Safety: Immediately signals the gas valve to close if the flame is lost, preventing hazardous accumulation. Durability: High-temperature metal alloy rod resists rapid oxidation and pitting common in industrial heaters. System Reliability: Restores consistent ignition cycles and prevents efficiency-draining short-cycling. Common Questions What are the signs of a failing Reznor 222771 sensor? The most common symptom is the heater shutting down exactly 2 to 5 seconds after the burners ignite, often caused by a low microamp reading. Can this sensor be cleaned instead of replaced? While light oxidation can be buffed off with an emery cloth, cracked porcelain or pitted metal requires a full replacement to ensure proper electrical grounding. Is this compatible with older Reznor units? This part is the standard modern replacement for many F, FE, and RDCB model series; always verify your specific unit's parts list for the 222771 number. 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.
