Lennox 10J58 Ignition Control

The Lennox 10J58 Ignition Control (also identified as 10J5801) is a critical direct spark ignition (DSI) board designed for precise burner sequencing in high-efficiency Lennox furnace and air handler units. This microprocessor-based ignition module monitors flame sensing and manages the gas valve timing to ensure safe combustion cycles. Technicians regularly utilize this part as a direct replacement for Johnson Controls G776RGD-11 and G776RGD-1, ensuring the system maintains its OEM performance standards. Built to withstand the thermal stress of residential and light commercial HVAC cabinets, the 10J58 provides consistent ignition timing and safety shutdowns in the event of persistent flame failure. Field reliability is enhanced by its ability to integrate seamlessly with existing wiring harnesses, making it a standard inventory item for maintaining Lennox G24 and G21 series units. This board is essential for resolving lockout codes and intermittent startup issues caused by failing legacy control modules.

• Direct OEM Replacement: Fully compatible with Lennox 10J5801 and Johnson Controls G776RGD series, eliminating the need for complex field wiring modifications.
• Reliable Flame Sensing: Features high-sensitivity flame rectification circuitry to prevent nuisance lockouts and ensure stable burner operation.
• Optimized Sequencing: Precise control of the pre-purge and trial-for-ignition intervals to maximize component life and safety.
• Robust Build Quality: Industrial-grade circuit board construction designed to handle the voltage fluctuations and vibration common in furnace inducer assemblies.

How do I troubleshoot a lockout on a Lennox 10J58 board?
Verify the 24V supply to the module and inspect the flame sensor for carbon buildup. If the board initiates a spark but the gas valve fails to stay energized after the trial period, check the microamp signal on the sensing circuit.

Is the 10J5801 interchangeable with the 10J58?
Yes, the 10J58 and 10J5801 are identical units. They share the same technical specifications, mounting footprint, and electrical terminal configurations.

What causes typical ignition control failure in Lennox units?
Common failure points include solder joint fatigue, moisture intrusion in the cabinet, or a failed high-voltage transformer within the module that prevents the spark from reaching the electrode.

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.