OEM Lennox Gas Valve — 56M40
OEM Guaranteed
Same-Day Ship
30-Day Returns
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The Lennox 56M40 is a genuine OEM gas valve that controls the flow of natural or LP gas into the burners of your Lennox furnace. Working in concert with the ignition control board, it opens and closes on demand to deliver precise, safe fuel metering during every heating cycle. This valve is built to Lennox factory specifications to ensure correct pressure regulation and a proper seal.
Common failure symptoms include a furnace that lights intermittently or not at all, weak or fluctuating flames, a gas odor near the unit, unusual clicking or buzzing from the valve, or the burners failing to stay lit. A stuck or leaking gas valve is a safety concern and should be replaced promptly.
Why OEM matters: A gas valve is a critical safety component, and Lennox equipment depends on exact pressure settings and reliable shut-off. The genuine 56M40 guarantees the correct orifice sizing, regulation, and fail-safe operation your furnace was engineered around — protecting your home and preserving your equipment warranty. Always have gas components installed by a qualified technician.
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