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Lennox

OEM Lennox Pressure Switch with Bracket — 15M20

SKU: LNX-15M20 Brand: Lennox
$24.95 $34.95

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Texas CMBL #19328542014
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The genuine OEM Lennox 15M20 is a furnace pressure switch supplied with its mounting bracket for direct, hassle-free installation in your Lennox gas furnace. This safety control monitors negative pressure created by the draft inducer motor to confirm the venting system is clear and combustion gases are being properly exhausted. Only when the 15M20 senses adequate draft will it close its contacts and permit the furnace to proceed to ignition.

Common failure symptoms: The inducer motor energizes but the igniter and burners do not fire, the furnace repeatedly locks out on a pressure-switch code, or heating is intermittent. Typical causes include a failed diaphragm, blocked or cracked sensing hose, condensate in the tubing, or a switch that no longer actuates at its rated setpoint.

Why OEM matters: This switch is calibrated to a specific pressure threshold and the included bracket ensures correct positioning and hose routing on your Lennox unit. The factory 15M20 guarantees the right activation point and mechanical fit — a generic replacement with the wrong calibration or mounting can cause false trips or compromise safe combustion. Choose the genuine OEM assembly for reliable draft verification and proper installation 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 Pressure Switch fit my Lennox OEM Lennox Pressure Switch with Bracket — 15M20?
Yes. This is the factory-specified OEM pressure switch for the Lennox OEM Lennox Pressure Switch with Bracket — 15M20. 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 pressure switch on my Lennox OEM Lennox Pressure Switch with Bracket — 15M20?
Difficulty: Medium (20–30 min)
Step 1: Turn off power. Step 2: Locate pressure switch near draft inducer. Step 3: Note tubing orientation. Step 4: Disconnect tubing and wires. Step 5: Remove screw, install new switch. Step 6: Reconnect tubing and wires, restore power.
My furnace shows a pressure switch error. What do I replace?
Furnace LED showing pressure switch error = switch not detecting draft inducer airflow. Try first: clear the rubber tubing to the switch (often clogged with condensation). If problem persists, replace the pressure switch.
Is this pressure switch 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 pressure switch?
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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