Fenwal 05-100000-426 Ignitor Sensor

The Fenwal 05-100000-426 Ignitor Sensor is a critical replacement component designed for precise flame detection and reliable ignition cycles in gas-fired HVAC systems. Engineered for high-temperature environments, this sensor features a durable Kanthal flame rod that maintains signal integrity under constant thermal stress. It operates as a remote flame sensor, compatible with various Fenwal ignition modules and control boards that utilize flame rectification technology. For contractors performing preventative maintenance or diagnosing lockout errors, this OEM-quality sensor ensures the burner assembly receives accurate feedback to prevent fuel buildup and nuisance shutdowns. The low-profile design and 0.25-inch spade terminal allow for straightforward integration into existing burner manifolds. When troubleshooting intermittent ignition failures, replacing a carbon-fouled or cracked ceramic insulator with a fresh 05-100000-426 is a standard protocol to restore system reliability and peak operational efficiency.

Key Technical Benefits

• Compatible with high-voltage Fenwal 24V ignition controls and DSI systems.
• Robust ceramic insulator prevents voltage leakage to the burner ground.
• High-grade Kanthal alloy rod resists oxidation and withstands extreme combustion temperatures.
• Standard 1/4" male spade connector simplifies wiring into current wire harnesses.
• Precision-engineered for flame rectification, ensuring rapid signal response to the controller.

Common Technical Questions

How do I test the Fenwal 05-100000-426 for proper operation?
Set your multimeter to the microamps (µA) scale and wire it in series with the sensor lead. A functioning sensor should typically provide a stable flame rectification signal above 1.0 microamp, depending on your specific control module's requirements.

Can I clean the flame rod instead of replacing it?
While cleaning with a non-conductive abrasive can temporarily remove carbon deposits, microscopic pitting on the Kanthal rod can lead to recurring phantom flame failures. Total replacement is recommended to ensure long-term reliability for the client.

What causes this sensor to fail prematurely?
Frequent causes include cracked porcelain insulators from thermal expansion or physical stress, and heavy silicon or carbon buildup which insulates the rod from the ions in the flame, breaking the rectification circuit.

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.