Fenwal 22-100001-352 Flame Sensor

When you are dealing with nuisance lockouts or "no flame" error codes on a gas-fired boiler, furnace, or water heater, the Fenwal 22-100001-352 Flame Sensor is the primary diagnostic component to inspect. This OEM Fenwal flame sensing rod is engineered for high-accuracy flame rectification, converting the presence of a flame into a microamp signal that the ignition module can process. Built with professional-grade glazed Alumina ceramics and certified rod materials, it is designed to withstand the extreme heat of combustion chambers up to 2175° F. As a critical HVAC safety control, it ensures the gas valve remains open only when a stable flame is present, preventing hazardous gas accumulation. This replacement flame sensor is a standard stock item for service trucks, compatible with a wide range of atmospheric and power-vented burners found in commercial and residential heating equipment.

• Enhanced Signal Reliability: Maintains the 5 microamp minimum threshold required for modern gas ignition controls to prevent short cycling.
• Extreme Heat Resistance: High-quality ceramic insulation prevents voltage leakage even in high-temperature environments up to 1190° C.
• Universal Application: Frequently used across major brands like Laars, Aerco, and Pentair for reliable remote flame sensing.
• Durable Construction: Robust rod material resists oxidation and soot buildup, extending the intervals between necessary cleanings.
• Safety Integration: Facilitates immediate shutdown upon flame failure to meet strict safety regulations for gas-fired equipment.

How do I test the Fenwal 22-100001-352 if the system is locking out?
Use a multimeter set to DC microamps (µA) in series with the sensor wire. You should see a steady reading above 5 µA once the flame is established. If the reading is low or fluctuating, check for a poor ground path or carbon buildup on the rod.

Can this sensor be cleaned, or should it be replaced?
If the rod has light soot, you can gently clean it with a non-conductive abrasive pad. However, if the glazed Alumina ceramic is cracked or the rod is severely pitted from high-heat exposure, replacement is necessary to ensure consistent flame detection.

What causes a "flame not sensed" error if the sensor is new?
Check the burner ground. In flame rectification, the current must travel through the flame to the burner head and back to the control ground. Ensure the burner is free of rust and the mounting bracket provides a solid electrical bond.

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.