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OEM Lennox Flame Sensor — 15K16
Lennox

OEM Lennox Flame Sensor — 15K16

SKU: LNX-15K16 Brand: Lennox
$19.95 $26.95

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Texas CMBL #19328542014
SAM.gov Registered
Govt POs Accepted

The genuine OEM Lennox 15K16 flame sensor safeguards your gas furnace by confirming the presence of a burner flame during every heating cycle. Through flame rectification, the sensor sends a small microamp current back to the control board, verifying combustion so the gas valve stays open only when it is safe. It is an essential part of your Lennox furnace's proof-of-flame safety system.

Common failure symptoms: A failing 15K16 sensor commonly causes the furnace to ignite and then flame out within seconds, repeated hard lockouts, intermittent or no heat, and short cycling. Oxidation or carbon buildup on the sensor rod is a frequent culprit, and a cracked or degraded sensor should be replaced rather than repeatedly cleaned.

Why OEM matters: Lennox control boards are tuned to a specific flame-sense signal threshold. Installing an OEM 15K16 ensures the correct rod material, length, and insulator so the board reads a clean, in-spec signal. This eliminates the nuisance faults and reliability problems that plague generic substitutes and restores dependable, code-compliant furnace operation.

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 Flame Sensor fit my Lennox OEM Lennox Flame Sensor — 15K16?
Yes. This is the factory-specified OEM flame sensor for the Lennox OEM Lennox Flame Sensor — 15K16. 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 flame sensor on my Lennox OEM Lennox Flame Sensor — 15K16?
Difficulty: Easy (10–15 min)
Step 1: Turn off power/gas. Step 2: Open furnace panel. Step 3: Locate flame sensor rod near burners. Step 4: Remove single mounting screw. Step 5: Clean rod with 400-grit sandpaper until shiny (or replace). Step 6: Reinstall and tighten. Most common furnace repair — saves $150–$300 vs technician.
My furnace lights then shuts off after a few seconds. Why?
Furnace lights then shuts off after 3–10 seconds = dirty flame sensor in 90% of cases. The sensor can’t detect flame through oxidation buildup. Fix: clean with 400-grit sandpaper (free, 15 min). If cleaning doesn’t work, replace the sensor.
Is this flame sensor 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 flame sensor?
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
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