Fenwal 35-605601-203 Control

The Fenwal 35-605601-203 is a professional-grade 24V direct spark ignition (DSI) control module engineered for high-performance gas-fired heating systems. This microprocessor-based HVAC ignition control provides precise timing sequences, featuring a 30-second pre-purge to clear the combustion chamber and a 7-second trial for ignition (TFI) to ensure reliable burner start-up. Designed with a durable Noryl gray fire-retardant enclosure, this DSI module supports both local and remote flame sensing, making it a versatile OEM replacement part for various furnaces, boilers, and water heaters. The 35-605601-203 ignition board includes on-board LED diagnostics that flash specific fault codes, allowing technicians to rapidly troubleshoot gas ignition issues and verify flame signal strength via dedicated test pins. This unit is a direct cross-reference for obsolete models like the 35-605601-205 and serves as an effective replacement for JCI G76 series controls, ensuring seamless integration into existing 24 VAC systems.

• Enhanced Safety: Integrated microprocessor performs continuous self-checks and 30-second pre-purge cycles to ensure safe combustion environments.
• Reliable Diagnostics: On-board LED provides immediate feedback on system status and fault codes, reducing downtime during service calls.
• Installation Flexibility: Compact design with three ground terminals and edge connector simplifies wiring in tight furnace or boiler cabinets.
• Flame Sensing Accuracy: Utilizes DETECT-A-FLAME technology for full-time monitoring, responding to flame loss in under 0.8 seconds.

How do I troubleshoot a lockout on the Fenwal 35-605601-203?
Check the integrated LED. A steady on light indicates internal ignition control failure, while specific pulse patterns correlate to ignition lockout or flame signal issues. Use a DC microammeter on the FC terminals to ensure a minimum flame current of 0.7 µA.

Is this module compatible with both Natural Gas and LP systems?
Yes, this direct spark ignition module is designed to work with natural, LP, and manufactured gases, provided the appliance regulator and orifices are correctly configured for the fuel type.

Can the 35-605601-203 replace other Fenwal 35 Series modules?
It serves as a direct replacement for the 35-605601-205. Always verify that the 24V input and specific 7-second TFI and 30-second pre-purge timings match your original equipment specifications before installation.

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.