What are the specs for this Pressure Switch?

The correct replacement for Lennox model OEM Lennox Pressure Switch — 33W17 is this exact part. It is the factory-specified replacement with exact OEM specifications. Using a part with different specifications can cause equipment damage or void your warranty. You can verify this by checking the data plate on your Lennox equipment which lists the model number OEM Lennox Pressure Switch — 33W17.

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OEM Lennox Pressure Switch — 33W17

Name: OEM Lennox Pressure Switch — 33W17
Brand: Lennox
SKU: LNX-33W17
Price: 24.95 USD
Availability: InStock

SKU: LNX-33W17 Brand: Lennox

$24.95 $34.95

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The genuine OEM Lennox 33W17 pressure switch is a critical safety component in your Lennox gas furnace. It monitors venting and combustion air flow, confirming that the draft inducer is moving exhaust gases safely before the control board permits ignition. This part is a direct factory replacement engineered to the exact pressure set point your Lennox unit requires.

Common failure symptoms: A failing 33W17 often causes the furnace to lock out on startup, short cycle, or display a pressure switch fault code. You may notice the inducer motor running but the burners never lighting, or the furnace repeatedly attempting ignition without producing heat. Cracked hoses, a stuck diaphragm, or a switch that fails to close on a call for heat are typical causes.

Why OEM matters: Lennox furnaces are calibrated to a specific switch trip pressure measured in inches of water column. Universal or aftermarket switches with the wrong set point can allow unsafe operation or cause nuisance lockouts. Installing the genuine 33W17 guarantees the correct pressure rating, proper terminal fit, and dependable safety protection for 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

OEM Lennox Pressure Switch — 33W17

$24.95

Frequently Asked Questions

Does this Pressure Switch fit my Lennox OEM Lennox Pressure Switch — 33W17?

Yes. This is the factory-specified OEM pressure switch for the Lennox OEM Lennox Pressure Switch — 33W17. 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 — 33W17?

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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OEM Lennox Pressure Switch — 33W17

Shipping Information

Return Policy

Frequently Asked Questions