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Lennox

OEM Lennox Pressure Switch — 14A45

SKU: LNX-14A45 Brand: Lennox
$24.95 $34.95

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Texas CMBL #19328542014
SAM.gov Registered
Govt POs Accepted

The genuine OEM Lennox 14A45 pressure switch is a safety control that confirms proper combustion airflow and venting before your Lennox furnace is allowed to ignite. It senses the negative pressure created by the draft inducer motor and closes only when adequate airflow is verified — ensuring flue gases are being safely vented and preventing ignition under blocked-vent conditions.

Common failure symptoms: the furnace failing to ignite, the inducer running but no burner light-off, repeated lockouts, or an error code indicating an open pressure switch. Failures are often caused by a cracked pressure hose, blocked vent or condensate drain, a weak inducer, or a switch whose diaphragm has fatigued and no longer actuates at the correct setpoint.

Why OEM matters: the Lennox 14A45 is factory-set to the precise pressure threshold your furnace model requires. A switch with the wrong setpoint can allow unsafe operation or cause persistent nuisance lockouts. Installing the factory-specified part ensures accurate draft proving, dependable safety response, and full compatibility with 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 — 14A45?
Yes. This is the factory-specified OEM pressure switch for the Lennox OEM Lennox Pressure Switch — 14A45. 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 — 14A45?
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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