Fenwal 35-655800-003 Control

The Fenwal 35-655800-003 is a microprocessor-based 24V hot surface ignition (HSI) control designed for precise burner sequencing in gas-fired heating applications. Engineered for reliability in furnaces, boilers, and commercial water heaters, this ignition control module manages the 1-trial ignition sequence with high-level diagnostic support. Operating on a 24VAC power supply, the unit provides a stable 7-second trial for ignition (TFI) period, ensuring consistent flame establishment without the need for traditional spark igniters. Its compact, non-position-sensitive design allows for flexible mounting in space-constrained cabinets, while the Noryl fire-retardant enclosure protects critical internal circuitry from harsh mechanical environments.

This Fenwal 35 series ignition module is a direct-drive solution for technicians looking to optimize combustion efficiency. It features zero pre-purge and zero inter-purge timings, making it an ideal HVAC replacement part for systems requiring immediate ignition response. The on-board diagnostic LED simplifies field troubleshooting by providing clear fault codes, reducing downtime during critical service calls. With its edge connector interface, the 35-655800-003 integrates seamlessly with existing wiring harnesses, maintaining strict safety protocols by automatically de-energizing the gas valve upon flame failure detection.

• Precise Ignition Timing: Microprocessor logic ensures repeatable 7-second TFI cycles for consistent performance.
• Advanced Hardware Diagnostics: Integrated LED output assists contractors in rapid error identification and system monitoring.
• Durable Construction: Built with a high-grade Noryl N-190 plastic enclosure for superior thermal and impact resistance.
• Flexible Compatibility: Designed to function across various gas-fired appliances including residential and commercial units.
• Space-Saving Profile: Compact footprint and versatile mounting orientations accommodate tight equipment footprints.

• What does the 1-trial ignition (1TRY) mean for my sequence? This module attempts to ignite the burner once. If the flame is not sensed within the 7-second TFI, the system enters a safety lockout to prevent gas accumulation.
• Is a separate flame sensor required? The 35-655800-003 can utilize either local or remote flame sensing methods depending on your specific appliance configuration.
• Can this replace a spark ignition module? No, this is specifically a hot surface ignition control. It is designed to energize a glo-bar or HSI element rather than a high-voltage spark electrode.

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.