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Lennox

OEM Lennox 36" Flame Sensor Gas Fired Induced Draft Hot Water Boiler — Y5411

SKU: LNX-Y5411 Brand: Lennox
$19.95 $26.95

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Texas CMBL #19328542014
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Govt POs Accepted

The Lennox Y5411 is a genuine OEM 36-inch flame sensor designed for use in Lennox gas-fired induced draft hot water boilers, providing critical flame detection to confirm safe and consistent burner operation. When this sensor degrades or fails, your boiler may experience nuisance lockouts, repeated ignition attempts, or a complete failure to fire as the control board cannot verify flame presence. This direct OEM replacement ensures compatibility and reliable flame-sensing performance in the applicable Lennox induced draft hot water boiler models.

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 36" Flame Sensor Gas Fired Induced Draft Hot Water Boiler — Y5411?
Yes. This is the factory-specified OEM flame sensor for the Lennox OEM Lennox 36" Flame Sensor Gas Fired Induced Draft Hot Water Boiler — Y5411. 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 36" Flame Sensor Gas Fired Induced Draft Hot Water Boiler — Y5411?
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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