Fenwal 35-655605-001 Control

The Fenwal 35-655605-001 is a robust, microprocessor-based 24VAC hot surface ignition control designed for precise burner management in gas-fired HVAC systems. Engineered for high-demand commercial and industrial applications, this direct ignition module features a 3-try ignition sequence to ensure reliable combustion even in challenging draft conditions. With a refined 5-second trial for ignition (TFI) and a 40-second heat-up period for the igniter, it provides rapid response without the need for pre-purge or inter-purge (0IP) cycles. This specific 35-65 series ignition board is a critical component for maintaining secondary safety logic, utilizing advanced flame sensing technology to monitor the burner and prevent hazardous gas accumulation. Whether you are performing a field replacement on a boiler, unit heater, or furnace, this module's compact footprint and standard 1/4-inch quick-connect terminals allow for straightforward integration into existing 24V control circuits.

• Enhanced Ignition Reliability: Features a 3-try operation that attempts to establish flame three times before entering safety lockout, reducing nuisance service calls.
• Instant Responsiveness: Designed with zero inter-purge (0IP) and zero pre-purge, making it ideal for systems requiring immediate heat-up and ignition.
• OEM-Grade Safety: Employs sophisticated flame monitoring that reacts to flame loss within 0.8 seconds, immediately de-energizing the gas valve for maximum protection.
• Diagnostic Precision: Includes on-board LED indicators to streamline troubleshooting by identifying specific fault codes for ignition failure or sensing errors.

What does the 5-second TFI mean for my setup?
The 5-second Trial for Ignition is the window the control allows for the flame to be sensed after the gas valve opens. If no flame is detected within this window, the valve closes to prevent unburned gas buildup.

Can this replace a module with a different TFI timing?
It is critical to match the TFI and purge timings exactly to the appliance manufacturer’s specifications. Using a 5-second TFI board in a system designed for 7 or 10 seconds may cause premature lockouts.

How do I resolve a lockout on this Fenwal board?
Lockout can be reset by cycling the thermostat below room temperature or removing the 24VAC power supply for at least 5 seconds. If the unit continues to lock out, check the flame sensor rod and system ground.

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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.