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OEM Lennox Dual Pressure Switch Assembly — 33W19
Lennox

OEM Lennox Dual Pressure Switch Assembly — 33W19

SKU: LNX-33W19 Brand: Lennox
$24.95 $34.95

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Texas CMBL #19328542014
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The genuine OEM Lennox 33W19 dual pressure switch assembly monitors combustion airflow and venting draft, confirming that the draft inducer has established proper pressure before the furnace is allowed to ignite. Its two switches verify draft at multiple firing conditions, acting as a key safety interlock in compatible Lennox gas furnaces.

Common failure symptoms: A faulty pressure switch commonly causes no-heat conditions, ignition lockouts, and blinking fault codes on the control board. You may see the furnace attempt to start and then shut down, cycle repeatedly, or refuse to fire because the switch is stuck open, stuck closed, or reading incorrect pressure.

Why OEM matters: The 33W19 is calibrated to the precise pressure setpoints (in inches of water column) your Lennox furnace requires. An incorrectly rated aftermarket switch can allow the furnace to fire without safe venting or nuisance-trip on every cycle. Genuine OEM guarantees the correct trip points and connections, preserving both safe combustion and reliable heating.

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 Dual Pressure Switch Assembly — 33W19?
Yes. This is the factory-specified OEM pressure switch for the Lennox OEM Lennox Dual Pressure Switch Assembly — 33W19. 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 Dual Pressure Switch Assembly — 33W19?
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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