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OEM Lennox Flame Sensor — 49M84
Lennox

OEM Lennox Flame Sensor — 49M84

SKU: LNX-49M84 Brand: Lennox
$19.95 $26.95

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Texas CMBL #19328542014
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The genuine OEM Lennox 49M84 flame sensor is a critical safety component in your gas furnace. It uses flame rectification to confirm that the burners have ignited, signaling the control board to keep the gas valve open. Designed as a direct factory replacement, the 49M84 ensures precise fit and reliable flame detection for compatible Lennox furnaces.

Common Failure Symptoms

Over time, oxidation and carbon buildup coat the sensor rod, weakening the microamp signal the furnace relies on. Typical symptoms include the furnace lighting and then shutting down after a few seconds, short cycling, repeated ignition lockouts, or the blower running with no heat. A failing flame sensor is one of the most common causes of no-heat calls in cold weather.

Why OEM Matters

Aftermarket sensors often produce an out-of-spec flame signal that trips your furnace's safety logic, leading to nuisance lockouts. The OEM Lennox 49M84 is calibrated to your furnace's ignition control for consistent, code-compliant operation and long service life. Choosing genuine Lennox parts protects your equipment warranty and keeps your system running safely.

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 — 49M84?
Yes. This is the factory-specified OEM flame sensor for the Lennox OEM Lennox Flame Sensor — 49M84. 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 — 49M84?
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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