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Lennox

OEM Lennox Pressure Switch — 80W57

SKU: LNX-80W57 Brand: Lennox
$24.95 $34.95

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Texas CMBL #19328542014
SAM.gov Registered
Govt POs Accepted

The genuine OEM Lennox 80W57 pressure switch is a safety control that confirms proper airflow and draft conditions before your Lennox furnace or HVAC system is allowed to operate. By sensing the pressure differential created by the inducer motor, it verifies that the venting path is clear and the combustion process can proceed safely, acting as a key interlock in the ignition sequence.

Symptoms of a failing 80W57 include the furnace not igniting, short cycling, the inducer running while the burners stay off, or control-board error codes pointing to an open or stuck pressure switch. Blocked vent piping, a disconnected or plugged pressure hose, and internal contact wear all produce these same faults and lead to frustrating intermittent no-heat conditions.

OEM matters because the 80W57 is calibrated to the exact trip point Lennox specifies for your equipment. A generic switch with the wrong threshold can cause nuisance lockouts or defeat the safety function altogether. This direct factory replacement guarantees correct calibration, proper fit, and dependable safety operation for your Lennox system.

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 — 80W57?
Yes. This is the factory-specified OEM pressure switch for the Lennox OEM Lennox Pressure Switch — 80W57. 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 — 80W57?
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
HVAC Parts Specialist — Online