OEM Lennox Ignition Control Module — 56L85
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The Lennox 56L85 ignition control module is the brain that governs your furnace's ignition sequence. It sequences the inducer motor, gas valve, and igniter while continuously monitoring flame sense and safety limits to ensure clean, reliable startups on your Lennox equipment. This OEM board is engineered to the exact firmware and pinout your system expects, so it drops in without adapters or rewiring.
When the 56L85 fails, you'll often see no ignition at all, short cycling, the blower running without heat, or a diagnostic LED flashing a fault code. Cracked traces, failed relays, and heat-stressed components are common culprits as a module ages in the hot furnace cabinet.
Choosing OEM matters on ignition control. Aftermarket boards can mis-time the gas valve or misread the flame signal, creating nuisance lockouts and, worse, real safety risks. The genuine Lennox 56L85 preserves the factory ignition logic, safety timings, and warranty compatibility your Lennox furnace was designed around — restoring dependable, code-correct heating.
Shipping Information
- Orders placed before 3PM CST ship same business day
- Standard delivery: 2-5 business days
- Express shipping available at checkout
- Free shipping on orders over $75
- Tracking number emailed upon shipment
Return Policy
- 30-day returns on unused parts in original packaging
- Electrical parts (capacitors, contactors, control boards) are final sale once installed
- Email info@nationalhvacparts.com to initiate a return
- Refunds processed within 5-7 business days