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Lennox

OEM Lennox Heat Exchanger Assembly — 10A55

SKU: LNX-10A55 Brand: Lennox
$399.95 $549.95

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Texas CMBL #19328542014
SAM.gov Registered
Govt POs Accepted

The Lennox 10A55 is a genuine OEM heat exchanger assembly (factory references 605996-77 and 612224-04) designed for Lennox gas furnaces. This component transfers combustion heat to the air moving through your furnace while forming a sealed barrier that keeps flue gases and carbon monoxide out of your home's air supply. Built to Lennox specifications, it delivers the correct heat transfer surface area and airflow characteristics your furnace was engineered around.

Common failure symptoms: Watch for visible cracks, rust, or scaling on the exchanger cells, a burner flame that distorts or rolls out when the blower engages, soot deposits, popping or rumbling noises during heating cycles, and frequent lockouts on the high-limit switch. A tripped carbon monoxide alarm is the most serious warning sign and demands immediate attention.

Why OEM matters: As a combustion and safety part, the heat exchanger must match your furnace exactly. The genuine Lennox 10A55 is produced to precise factory tolerances for metallurgy, sealing surfaces, and pressure integrity — guaranteeing a leak-free installation and full rated efficiency. Generic replacements can compromise the combustion seal and put your household at risk, so always choose the authentic Lennox assembly.

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 Heat Exchanger fit my Lennox OEM Lennox Heat Exchanger Assembly — 10A55?
Yes. This is the factory-specified OEM heat exchanger for the Lennox OEM Lennox Heat Exchanger Assembly — 10A55. 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 heat exchanger on my Lennox OEM Lennox Heat Exchanger Assembly — 10A55?
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 heat exchanger?
Common symptoms: unusual noises, intermittent operation, complete failure, or visible damage. Visit our diagnostic hub for symptom-based troubleshooting.
Is this heat exchanger 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 heat exchanger?
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