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Lennox

OEM Lennox Relative Humidity Sensor Kit — 17M50

SKU: LNX-17M50 Brand: Lennox
$24.95 $34.95

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Texas CMBL #19328542014
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The genuine OEM Lennox 17M50 Relative Humidity Sensor Kit measures the moisture content of the air moving through your Lennox system and reports it to the control board or comfort thermostat. Accurate humidity readings allow your equipment to manage dehumidification, overcooling, and indoor comfort — making this a key component in Lennox systems equipped with humidity-based control.

Common failure symptoms: When the 17M50 sensor drifts or fails, you may notice inaccurate humidity readings on the thermostat, a home that feels clammy or muggy despite the system running, erratic dehumidification cycles, or humidity-related fault codes at the control board. A failed sensor can also cause the system to over- or under-cool as it tries to hit an incorrect target.

Why OEM matters: Lennox calibrates its humidity control logic to the specific output curve of the factory sensor. A generic substitute may report values that fall outside the range the board expects, leading to poor comfort and unnecessary runtime. The OEM 17M50 kit guarantees the correct signal, connector, and mounting for a reliable, drop-in replacement in your Lennox equipment.

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 Sensor fit my Lennox OEM Lennox Relative Humidity Sensor Kit — 17M50?
Yes. This is the factory-specified OEM sensor for the Lennox OEM Lennox Relative Humidity Sensor Kit — 17M50. 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 sensor on my Lennox OEM Lennox Relative Humidity Sensor Kit — 17M50?
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 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 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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