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Lennox

OEM Lennox Premix Burner — 15P43

SKU: LNX-15P43 Brand: Lennox
$49.95 $69.95

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Texas CMBL #19328542014
SAM.gov Registered
Govt POs Accepted

The genuine OEM Lennox 15P43 premix burner mixes gas and combustion air before ignition to produce a clean, controlled, high-efficiency flame in your Lennox gas furnace. Premix designs are standard in condensing furnaces because they maintain a precise air-fuel ratio for lower emissions, quieter operation, and better fuel economy.

Common failure symptoms: As the burner ages or corrodes, you may see delayed or noisy ignition, rumbling or popping at start-up, a yellow or uneven flame, soot accumulation, short cycling, or lockouts caused by weak flame sensing. Blocked or eroded burner ports disturb combustion and can trip the furnace safety controls.

Why OEM matters: The Lennox 15P43 burner is built to exact port sizing, orifice specifications, and material composition for your furnace. The factory part ensures correct flame characteristics, proper heat-exchanger performance, and compliance with Lennox safety and efficiency ratings. Generic replacements risk poor combustion and nuisance faults — OEM keeps your system running as designed and preserves warranty coverage.

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

Frequently Asked Questions

Does this Burner fit my Lennox OEM Lennox Premix Burner — 15P43?
Yes. This is the factory-specified OEM burner for the Lennox OEM Lennox Premix Burner — 15P43. It is a direct drop-in replacement that fits without modification. Always verify the model number on your equipment nameplate before ordering.
How do I replace the burner on my Lennox OEM Lennox Premix Burner — 15P43?
Refer to your equipment service manual for model-specific steps. General approach: turn off power, photograph connections, remove old part, install new part, restore power and test. For gas components, hire a licensed technician. Email info@nationalhvacparts.com for guidance.
What symptoms mean I need a new burner?
Common symptoms: unusual noises, intermittent operation, complete failure, or visible damage. Visit our diagnostic hub for symptom-based troubleshooting.
Is this burner compatible with Bryant or Payne too?
Many Lennox parts are cross-compatible with Bryant and Payne since all three brands are manufactured by Carrier Global Corporation. The same physical part is often used across brand labels with different model numbers. To verify: check your Bryant or Payne equipment service manual for cross-compatible part numbers, or email info@nationalhvacparts.com with your model number.
Should I use OEM or aftermarket for my Lennox burner?
OEM recommended for reliability and warranty compatibility. OEM parts match exact factory specifications for proper fit, performance, and safety. While aftermarket alternatives cost less upfront, the risk of improper fit and reduced lifespan usually makes OEM the better value long-term.
How fast does National HVAC Parts ship?
Orders placed before 3:00 PM CST ship the same business day. Standard delivery is 2–5 business days anywhere in the continental United States. Express shipping available at checkout. We ship from Houston, TX to all 50 states. 30-day return policy on all parts.
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Mike Rivera
HVAC Parts Specialist — Online