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Lennox

OEM Lennox Pressure Switch — Y8805

SKU: LNX-Y8805 Brand: Lennox
$24.95 $34.95

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Texas CMBL #19328542014
SAM.gov Registered
Govt POs Accepted

The genuine OEM Lennox Y8805 pressure switch is a draft-proving safety control that verifies correct combustion airflow before your Lennox furnace fires. Working with the draft inducer motor, it senses the negative pressure in the venting system and closes its contacts only when safe airflow is confirmed — a required step in the ignition sequence that protects against improper venting and flue-gas spillage.

Common failure symptoms: the furnace not lighting despite a running inducer, ignition lockouts, intermittent no-heat calls, or a control board reporting an open or stuck pressure switch. Common causes include a clogged pressure tube, blocked vent or drain, a failing inducer, or a switch diaphragm that no longer trips at the proper pressure.

Why OEM matters: the Lennox Y8805 is calibrated to the exact pressure setpoint your furnace was designed around. Non-OEM switches with different thresholds can permit unsafe operation or cause frustrating nuisance lockouts. The factory-specified part delivers accurate draft verification, reliable safety performance, and guaranteed compatibility with 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 — Y8805?
Yes. This is the factory-specified OEM pressure switch for the Lennox OEM Lennox Pressure Switch — Y8805. 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 — Y8805?
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