OEM Lennox Ignition Wire — 25W57
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The genuine OEM Lennox 25W57 ignition wire carries the high-voltage signal from the control board or ignition module to the ignitor, ensuring a clean, consistent spark or hot-surface ignition at furnace startup. Its insulation and connectors are rated for the heat and voltage found near the burner assembly, where ordinary wire would quickly degrade.
When an ignition wire begins to fail, you may see intermittent or no ignition, repeated ignition-lockout error codes, delayed light-off with a small "whoomp" on start, or visible cracking and burn marks on the insulation. Loose or corroded terminals can create a weak spark that leaves the furnace unable to reliably light.
Using an OEM Lennox 25W57 guarantees the correct length, terminal style, and high-temperature rating for a direct, no-splice fit in your Lennox furnace. Off-brand leads can arc, melt, or lose connection over time. Replacing with the factory part restores dependable ignition and protects the surrounding components from heat damage.
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