Fenwal 35-533555-113-0G Board

The Fenwal 35-533555-113-0G is a microprocessor-based 12VDC Direct Spark Ignition (DSI) control engineered for high-reliability performance in RV gas furnaces, mobile heating units, and specialized industrial equipment. Designed for systems requiring precise timing, this 12VDC ignition board features a 15-second pre-purge cycle to ensure combustion chambers are clear of residual gas before the 7-second trial for ignition (TFI) begins. This harmonized 35-53 series module utilizes a multi-try logic—specifically a 3-try ignition sequence—to maximize successful burner light-off in demanding field conditions while preventing unauthorized gas accumulation through its safety lockout functionality. The board includes on-board LED diagnostics for rapid troubleshooting, allowing technicians to identify airflow faults, flame sensing issues, or internal control failures without external tools. With a heavy conformal coating to protect against moisture and vibration, this Fenwal ignition module is a direct drop-in replacement for numerous legacy DC controls, ensuring backward compatibility and simplified field service for contractors.

Key Benefits

• Precision Timing: Microprocessor control provides a consistent 15-second pre-purge and 7-second TFI for safe appliance operation.
• Diagnostic Capability: Integrated LED indicator simplifies service by flashing specific fault codes for rapid system assessment.
• Robust Environmental Protection: Features conformal coating to resist humidity, dust, and mechanical vibration, extending the service life in harsh RV or industrial environments.
• Smart Configuration: Automatically detects and manages combustion blower relay functions, enhancing compatibility across various 12VDC heating platforms.
• Multiple Ignition Tries: Utilizes a 3-try sequence to improve reliability during cold starts or with fluctuating gas pressure.

Common Questions

What does a steady red LED on the Fenwal 35-533555-113-0G indicate?
A steady-on LED typically signals an internal hardware or software failure. After verifying power and reset protocols, if the steady light persists, the control module generally requires replacement as these boards are not field-repairable.

Can I use this board to replace an older Fenwal 12VDC analog control?
Yes, the 35-53 series is designed to be backward compatible with previous Fenwal 12VDC models. However, always verify your wiring harness and termination points match the specific pinout of the 35-533555-113-0G before installation.

How do I reset the module after an ignition lockout?
Lockout can be reset by cycling the thermostat's call for heat or removing the 12VDC power source for at least 5 seconds. This specific model also features a one-hour automatic reset function if the thermostat remains closed.

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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.