Fenwal 35-655605-011 Control

The Fenwal 35-655605-011 is a robust 24V Hot Surface Ignition (HSI) control module engineered for high-precision gas-fired appliance management. Built on a microprocessor-based platform, this unit manages the complete ignition sequence, including a 0-second pre-purge, 15-second inter-purge (15IP), and a 5-second Trial for Ignition (TFI). Designed for three distinct tries for ignition (3TRY), it ensures reliable burner performance in furnaces, boilers, and commercial water heaters. This HVAC ignition control board features local or remote flame sensing and on-board diagnostic LEDs to streamline troubleshooting for service technicians and contractors. By integrating full-time flame monitoring and specialized safety timings, the 35-655605-011 maintains stable combustion control in demanding residential and light commercial applications. This Fenwal replacement module is an industry standard for systems requiring a dependable 24VAC interface, microprocessor ignition logic, and field-tested safety shut-off protocols.

• Dependable Ignition Sequence: Features a 3-trial ignition attempts logic (3TRY) with a 5-second TFI to ensure consistent burner start-up in varied environmental conditions.
• Advanced Microprocessor Control: Utilizes precise timing for 15-second inter-purge (15IP) and immediate (0-second) pre-purge for rapid cycling.
• Diagnostic Efficiency: Equipped with an on-board LED that provides clear flash codes, reducing lead time on diagnostic calls and system repairs.
• Broad Application Versatility: Suitable for gas-fired furnaces, water heaters, and boilers, operating effectively in temperatures ranging from -40°F to 176°F.
• Enhanced Safety Monitoring: Maintains continuous flame sensing with a minimum 0.7 microamp sensitivity to prevent unsafe gas accumulation.

What is the difference between local and remote flame sensing on this module?
Local sensing uses the igniter itself to detect the flame, while remote sensing utilizes a separate flame rod. The 35-655605-011 is designed to support both configurations depending on your specific burner setup.

How do I interpret the diagnostic LED flash codes?
The LED provides troubleshooting feedback: a steady on indicates internal failure, two flashes signal flame detection without a call for heat, and three flashes indicate an ignition lockout after failed trials.

Does this control require a manual reset after a lockout?
Recovery from a 3-try lockout requires a manual reset. This is performed by either cycling the thermostat below room temperature or removing the 24VAC power supply for at least 5 seconds.

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.