Fenwal 35-655908-003 Ignition Control

The Fenwal 35-655908-003 is a 24 VAC microprocessor-based Hot Surface Ignition (HSI) control engineered for high-performance gas-fired appliances. Built for reliability in demand-heavy environments, this module manages the combustion blower, monitors airflow through the pressure switch, and executes a precise ignition sequence. This specific configuration features 0-second prepurge and 0-second inter-purge timings, combined with a 7-second Trial for Ignition (TFI), making it an ideal solution for systems requiring immediate terminal response. The Fenwal 35-65 series utilizes a 120/240V field-selectable line voltage to power the ignitor, providing versatility for various field applications while reducing the need for extensive truck stock. With an operating temperature range of -40°F to 176°F and on-board LED diagnostics, this ignition control board allows technicians to quickly identify system faults such as airflow failure or flame loss, ensuring maximum uptime and safety for commercial cooking equipment, boilers, and furnaces.

• Advanced Diagnostics: The integrated system diagnostic LED simplifies troubleshooting by providing clear flash codes for lockout and hardware failures.
• Multi-Voltage Capability: 120/240 VAC field selectable options allow for seamless integration with different hot surface ignitor requirements.
• Robust Flame Sensing: Features full-time flame sensing and high-sensitivity Detect-A-Flame technology for stable burner operation.
• Direct Replacement: Designed as a reliable furnace ignition module replacement for various 35-65 series controls and older 05 series models.
• Agency Certified: CSA and UL1998 compliant HVAC ignition module, ensuring the hardware meets rigorous industrial safety standards.

What does the 7-second TFI mean for sequence timing?
The 7-second Trial for Ignition is the window during which the gas valve is energized to establish a flame. If the Fenwal 35-655908-003 does not sense a flame current of at least 0.7 microamps within this period, it will safely de-energize the valve.

How do I troubleshoot a 3-flash LED code?
A 3-flash signal typically indicates an ignition lockout. This usually stems from a gas supply issue, a cracked ignitor, or a faulty flame sensor path. Verify the 24V supply to the module and ensure the burner is properly grounded.

Can this module be used with Natural Gas and LP?
Yes, this Fenwal HSI control is compatible with Natural, Proprane (LP), and manufactured gases, provided the appliance is configured for those fuels.

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.