Fenwal 35-655802-007 Ignition Control

The Fenwal 35-655802-007 is a high-performance 24V Hot Surface Ignition (HSI) Control engineered for precise burner management in gas-fired appliances. This microprocessor-based module features a 15-second Trial for Ignition (TFI) and is designed to replace aging 05-21, 05-24, and 05-32 series controls. For field versatility, it supports 120/240V field selectable line voltage for the ignitor while maintaining a standard 24VAC control circuit. Service technicians can utilize the on-board diagnostic LED for rapid troubleshooting of airflow faults or ignition lockouts. The unit provides full-time flame sensing with a minimum flame sense current of 0.7 microamps, ensuring stable operation for natural, propaned, or manufactured gas systems. Built for durability, it operates effectively within a temperature range of -40°F to 176°F, making it a reliable HVACR replacement part for commercial boilers, furnaces, and water heaters.

• Universal Compatibility: Multi-fuel support for natural, propane, and manufactured gas applications.
• Advanced Diagnostics: Integrated LED codes reduce downtime by identifying internal failures or pressure switch issues.
• Flexible Sensing: Supports both local and remote flame sensing configurations to match existing equipment geometry.
• Robust Timing: Precise 15-second TFI sequence managed by a dedicated microprocessor for repeatable performance.
• System Protection: Safe-start check and full-time flame monitoring prevent hazardous gas accumulation.

How do I reset the Fenwal 35-655802-007 after an ignition lockout?
Lockout can be cleared by cycling the thermostat below room temperature or removing the 24VAC power source for at least 5 seconds. On models equipped with the automatic reset feature, the control will attempt a new ignition sequence after a one-hour delay if the call for heat persists.

What do the LED flash codes indicate on this HSI control?
A steady "on" light indicates an internal control failure. Two flashes signal a flame signal is present without a call for heat, while three flashes indicate an ignition lockout. Rapid flashing typically points to an airflow fault or pressure switch failure.

Can this module be used with a 120V ignitor?
Yes, the 35-65 series features field-selectable line voltage. While the control circuit runs on 24VAC, you can provide 120VAC or 240VAC to the specific ignitor terminals to match the requirements of the hot surface element installed in the appliance.

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.