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OEM Lennox Flame Sensor — 69W43
Lennox

OEM Lennox Flame Sensor — 69W43

SKU: LNX-69W43 Brand: Lennox
$19.95 $26.95

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Texas CMBL #19328542014
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Govt POs Accepted

The genuine OEM Lennox 69W43 flame sensor is a critical safety device that verifies a flame is actually present after your furnace attempts ignition. Using flame rectification, it sends a small signal to the control board confirming the burners have lit — if no flame is detected, the board shuts off the gas valve to prevent unburned fuel from accumulating.

Common failure symptoms: A dirty or failing 69W43 is one of the most common causes of short cycling — the furnace lights, runs for a few seconds, then shuts down, repeating the sequence until it locks out. You may also see no heat, intermittent operation, or repeated ignition-lockout faults on the control board.

Why OEM matters: Flame sensors depend on precise placement, rod material, and electrical characteristics to generate a reliable microamp signal. The factory-original Lennox 69W43 is built to those exact specifications, ensuring dependable flame detection and full compatibility with your ignition control. For a component central to combustion safety, OEM is the right call.

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 — 69W43?
Yes. This is the factory-specified OEM flame sensor for the Lennox OEM Lennox Flame Sensor — 69W43. 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 — 69W43?
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
HVAC Parts Specialist — Online