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Lennox

OEM Lennox Enthalpy Sensor — 11G27

SKU: LNX-11G27 Brand: Lennox
$24.95 $34.95

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Texas CMBL #19328542014
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The genuine OEM Lennox 11G27 enthalpy sensor measures the total heat content of the air — combining temperature and humidity — so your economizer control can decide when outdoor air is suitable for free cooling. By continuously reporting enthalpy conditions, this sensor lets the system bring in cool, dry outdoor air instead of running the compressor, reducing energy use while maintaining comfort. It is built to the calibration and signal specifications required by Lennox economizer controls.

A failing enthalpy sensor commonly causes the economizer to open at the wrong times, pulling in hot or humid outdoor air, or to stay closed when free cooling would be ideal. You may see higher energy bills, poor humidity control, comfort complaints, or an economizer that behaves erratically. Drift, moisture damage, or a degraded sensing element all produce inaccurate readings that mislead the control logic.

Using the OEM Lennox 11G27 matters because economizer performance depends on an accurately calibrated enthalpy signal matched to your control board. Aftermarket sensors may report offset readings that defeat the energy savings the economizer is meant to deliver. The factory sensor restores precise measurement, correct fit, and full compatibility with 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 Enthalpy Sensor — 11G27?
Yes. This is the factory-specified OEM sensor for the Lennox OEM Lennox Enthalpy Sensor — 11G27. 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 Enthalpy Sensor — 11G27?
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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