Fenwal 35-605904-001 Control

The Fenwal 35-605904-001 Control is a microprocessor-based 24 VAC Direct Spark Ignition (DSI) module specifically engineered for high-performance gas-fired appliances, including special Heat N Glow fireplace systems. This ignition control module utilizes proprietary DETECT-A-FLAME technology to ensure precise flame sensing and rapid response to flame failure, typically within 0.8 seconds. Designed to manage the complete operating sequence, the Fenwal 35-605904-001 features a 30-second pre-purge cycle to clear the combustion chamber and an 8-second Trial for Ignition (TFI) period for reliable burner light-off. Its rugged, conformal-coated circuit board protects against moisture and vibrations, making it a staple for contractors handling residential or commercial HVAC furnace controls. The onboard diagnostic LED simplifies troubleshooting by providing clear flash codes for system lockouts or hardware internal failures. With a broad operating temperature range of -40°F to 176°F, this Fenwal ignition board delivers consistent timing and localized or remote flame sensing for natural, LP, and manufactured gas applications.

• Precision Timing: Microprocessor logic provides repeatable 30-second pre-purge and 8-second TFI sequences for safe ignition.
• Advanced Diagnostics: Integrated LED indicator simplifies field service by identifying specific fault codes and ignition lockouts.
• Robust Flame Sensing: Features DETECT-A-FLAME technology with a 0.7 microamps minimum sensing threshold for high-reliability operation.
• System Versatility: Compatible with Heat N Glow gas fireplaces and various 24V atmospheric or power-vented gas burners.
• Durability: Engineered to withstand harsh environments with 105°C rated wiring terminals and vibration-resistant mounting.

How do I troubleshoot a 'Steady On' LED on the 35-605904-001?
A steady on LED typically indicates an internal control failure. You should attempt to reset the system by removing 24V power for 5 seconds; if the condition persists, the module requires replacement.

Can I use this control for both Natural Gas and Propane?
Yes, this direct spark ignition control is multi-gas compatible and functions effectively with Natural, LP, and manufactured gases, provided the appliance regulator is correctly set.

What is the proper spark gap for this Fenwal module?
For optimal performance, the electrode gap should be maintained at 0.125" (± 0.031"). Note that electrodes are not field-adjustable and should be replaced if the gap is out of spec.

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.