OEM Lennox Ignition Control Board — 34M65
OEM Guaranteed
Same-Day Ship
30-Day Returns
Secure Checkout
The genuine OEM Lennox 34M65 ignition control board governs the complete startup and safety sequence of your furnace. It sequences the draft inducer, hot surface igniter, gas valve, and blower while validating flame signal and safety switch inputs, guaranteeing that every heating cycle begins in the proper order and terminates safely whenever an unsafe condition is sensed.
Common failure symptoms: When the 34M65 fails, you may experience no ignition, repeated lockouts, erratic or delayed startups, an inducer or blower that won't energize, or fault codes displayed on the board's diagnostic LED. Common causes include thermal stress, corroded connections, failed onboard relays, and voltage spikes.
Why OEM matters: A furnace control board must precisely match the manufacturer's timing, terminal layout, and safety algorithms. Aftermarket substitutes can misinterpret sensor data or bypass essential interlocks, risking unreliable heat or unsafe operation. The 34M65 is the exact OEM board your Lennox equipment was engineered to use, restoring dependable ignition, proper diagnostics, and factory-rated safety.
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