Lennox 80K12 Control

The Lennox 80K12 (OEM 35-605903-223) is a high-performance direct spark ignition control module engineered for precise furnace repair and system reliability. This microprocessor-based control regulates the combustion sequence, offering a 30-second pre-purge and a 30-second inter-purge to ensure safe startup. Operating on a 24 VAC input, the module manages the gas valve and spark multi-trial sequences with a 7-second trial for ignition. Designed as a robust HVAC part for Lennox and compatible brand units, it provides critical flame sensing and automatic reset after a one-hour lockout period if ignition fails. This genuine replacement ignition module is essential for technicians addressing air conditioner not working scenarios where integrated furnace controls have failed. Its compact edge-connect design allows for efficient installation in tight cabinets while maintaining strict flame failure response times of 0.8 seconds. This OEM Lennox part replaces legacy numbers 58C91, 15B51, and 36G57, ensuring full compatibility with existing 24V furnace wiring harnesses.

• Microprocessor Accuracy: Provides consistent timing for pre-purge, inter-purge, and ignition trials to maintain safe combustion.
• Multi-Trial Ignition: Features three trials for ignition before entering a secure 1-hour lockout, optimizing system uptime.
• Direct OEM Compatibility: Serves as a drop-in replacement ignition module for several legacy Lennox and Fenwal models including 80K1201 and 35-605903-223.
• Safety Monitoring: High-sensitivity flame sensing (0.7µA min) and fast response times prevent gas buildup during failed cycles.

What does the 1-hour lockout on the 80K12 mean?
If the control fails to sense a flame after three consecutive trials, it enters a safety lockout. It will automatically attempt a reset after 60 minutes, or you can manually reset it by cycling the 24V power.

Can I use this to replace a Fenwal Triton 2460D?
Yes, the 80K12 (35-605903-223) is a direct equivalent and technical successor to the Fenwal Triton 2460D series ignition controls used in Lennox equipment.

Does this module control the combustion blower?
This specific 35-60 series module is designed for direct spark ignition; ensure your specific wiring diagram matches the module's 24V output ratings for the gas valve and secondary controls.

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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.