What are the specs for this Pressure Switch?

The correct replacement for Lennox model OEM Lennox Pressure Switch — 12W48 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 — 12W48.

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Lennox

OEM Lennox Pressure Switch — 12W48

Name: OEM Lennox Pressure Switch — 12W48
Brand: Lennox
SKU: LNX-12W48
Price: 24.95 USD
Availability: InStock

SKU: LNX-12W48 Brand: Lennox

$24.95 $34.95

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The genuine OEM Lennox 12W48 pressure switch is a factory safety device that verifies proper draft before your furnace begins its ignition sequence. As the draft inducer motor spins up, it creates negative pressure that closes this switch, signaling the control board that the venting system is clear and combustion can proceed safely. Without a correctly functioning switch, the furnace will not fire.

Common failure symptoms: When the 12W48 pressure switch fails, the furnace typically locks out on ignition, short-cycles, or displays a pressure-switch fault code. Symptoms can also point to related issues such as a blocked flue, condensate drain, or inducer problems, so verify airflow before replacing. A stuck-open or stuck-closed diaphragm is the usual cause of failure.

Why OEM matters: Each Lennox pressure switch is calibrated to a model-specific trip point. Substituting a generic switch risks nuisance lockouts or unsafe operation if the set point differs. The OEM 12W48 guarantees the exact calibration, hose fitting, and electrical connector your Lennox furnace requires for safe, dependable 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

OEM Lennox Pressure Switch — 12W48

$24.95

Frequently Asked Questions

Does this Pressure Switch fit my Lennox OEM Lennox Pressure Switch — 12W48?

Yes. This is the factory-specified OEM pressure switch for the Lennox OEM Lennox Pressure Switch — 12W48. 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 — 12W48?

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 — 12W48

Shipping Information

Return Policy

Frequently Asked Questions