Reznor 204955 Ignition Control

The Reznor 204955 Ignition Control is a critical replacement direct spark ignition (DSI) module designed for precise sequence timing and burner flame monitoring in high-efficiency heating systems. This OEM Reznor replacement part is engineered for seamless integration with Reznor unit heaters, ensuring reliable pilotless ignition and immediate response to thermostat calls. Built for industrial durability, the 204955 ignition board features advanced circuitry to manage gas valve operation and safety lockouts, preventing unburned gas accumulation. When diagnosing furnace ignition failure, this board provides the necessary diagnostic consistency required for commercial HVAC troubleshooting. It operates as a direct replacement for legacy units, ensuring that system amperage draws and voltage requirements remain within factory specifications. For technicians performing HVAC repair, using this genuine component maintains the structural integrity and operational safety of the appliance while reducing callbacks caused by incompatible aftermarket universal controls.

Key Benefits

• OEM Compatibility: Specifically engineered for a precise fit in Reznor heating equipment, eliminating mounting and wiring challenges.
• Advanced DSI Logic: Features direct spark ignition technology for more efficient fuel utilization and faster heat transfer.
• Safety Lockout Protection: Integrated safeguards monitor flame rectification and shut down the system if a flame sensor error is detected.
• Rugged Circuitry: Designed to withstand the thermal cycling and high-vibration environments typical of industrial unit heaters.
• Direct Plug-and-Play: Minimizes downtime durante field replacement by utilizing standard Reznor controller wiring harnesses.

Common Questions

What causes a Reznor ignition control to fail?
Most failures result from voltage spikes, excessive moisture exposure, or localized overheating within the cabinet. If the module fails to send power to the gas valve or the igniter, the board should be tested for continuity and proper ground.

Can I use this 204955 board to replace a different brand?
This is an OEM Reznor part. While some DSI modules share similar footprints, the specific timing sequences and safety logic are tuned for Reznor burner assemblies. Always verify your heater's model and serial number before installation.

Does this module resolve "no flame" lockout codes?
Yes, if the diagnostic confirms the control board is not processing the flame rectification signal, replacing the 204955 will restore the proper ignition sequence, provided the flame probe itself is clean and functional.

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.