Reznor 204376 Board

The Reznor 204376 is a critical OEM ignition control board specifically engineered for gas-fired heating systems, including Reznor RDF direct-fired furnaces and various commercial unit heaters. This hot surface ignition (HSI) module operates on 120V AC and manages a precise sequence of operation, including a dedicated pre-purge time delay to clear the combustion chamber and a 100% lockout safety function if flame initiation fails. Designed to handle extreme environments, the board is rated for temperatures ranging from -40°F to 175°F, ensuring reliable HVAC burner control in demanding industrial settings. As a genuine Reznor replacement part, this module integrates a diagnostic LED indicator for immediate flash code feedback, significantly reducing HVAC troubleshooting time during service calls. Whether you are performing a conversion from older spark ignition sets or replacing a faulty HSI board, the Reznor 204376 provides the precise flame sensing and current regulation (3A rating) required to maintain system integrity and operational safety.

Key Benefits:

• Precise Ignition Sequence: Features integrated pre-purge and inter-purge delays to ensure safe and efficient gas burner startup.
• Enhanced Safety: Built-in 100% lockout logic and continuous flame monitoring to prevent hazardous gas accumulation.
• Diagnostic Intelligence: Includes an onboard diagnostic LED to identify flash codes and system faults quickly.
• Direct OEM Compatibility: Ensures seamless fit and function for Reznor RDF and unit heater models with no field modifications required.
• Robust Environmental Rating: Engineered to operate reliably in sub-zero or high-heat HVAC compartments.

Common Questions:

What does a steady or flashing LED on the Reznor 204376 indicate?
The LED provides diagnostic feedback; specific flash counts represent different states such as lockout, flame signal strength, or internal board failure. Always refer to the unit’s specific wiring diagram or service manual to decode these signals during HVAC troubleshooting.

Can this board replace an older spark ignition system?
Yes, the Reznor 204376 is the central component in most HSI conversion kits (like the 146268) designed to upgrade older spark-to-rectification or ultraviolet pilot systems on RDF models.

Does this board require a specific transformer?
While the board operates on 120V, it must be integrated with the system's 24V control circuit. Depending on the furnace model, ensure your transformer (typically 80VA or 200VA) meets the combined load requirements of the board and external relays.

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.