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OEM Carrier Furnace Pressure Switch 0.18 WC — PY3GNAA42090NA
Carrier

OEM Carrier Furnace Pressure Switch 0.18 WC — PY3GNAA42090NA

SKU: CARRIE-PY3GNAA42090NA-PRESSURE_SWITCH-HK06WC061 Brand: Carrier
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Texas CMBL #19328542014
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OEM Carrier Furnace Draft Pressure Switch 0.18" WC for Model PY3GNAA42090NA

This is the OEM-spec draft proving pressure switch for the Carrier PY3GNAA42090NA packaged gas/electric unit. The pressure switch monitors inducer motor operation by sensing negative air pressure in the flue passage. When the inducer creates sufficient draft, the switch closes and allows the control board to proceed with ignition. A failed pressure switch causes the furnace to lock out before the ignition sequence ever begins — often accompanied by a fault code indicating an open pressure switch. This part supersedes original OEM part number HK06WC061 and ships as the updated replacement HK06MB061, the current Carrier Factory Authorized Parts designation.

  • Specs: 0.18" W.C. (inches water column) rating | Single-port draft proving switch | Honeywell-manufactured (IS20224-5236) | Normally open, closes on inducer draft
  • OEM vs Generic: OEM pressure switches are calibrated to exact W.C. factory tolerances. Aftermarket units with off-spec setpoints can cause nuisance lockouts in cold weather or — worse — allow unsafe operation with inadequate flue draft. OEM is always the safer choice for pressure-proving components.
  • Install difficulty: 2/5 — Shut off power and gas supply before servicing. Tools needed: 1/4" nut driver, flathead screwdriver, multimeter (continuity test). Disconnect the rubber hose from the inducer port, unplug the spade connectors, and swap the switch. Always verify continuity across the switch terminals with the inducer running before reassembly.
  • Warranty: 1-year OEM factory warranty. In stock and ships same business day from our warehouse.

Compatibility: Engineered as the direct OEM replacement for Carrier model PY3GNAA42090NA. This switch also fits select Bryant and Payne packaged units sharing the same inducer assembly and 0.18" W.C. draft specification. Always verify the W.C. rating printed on your existing switch before ordering. Have a fitment question? Our HVAC parts specialists confirm compatibility before you buy — call or chat today.

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 $99
  • 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 Carrier OEM Carrier Furnace Pressure Switch 0.18 WC — PY3GNAA42090NA?
Yes. This is the factory-specified OEM pressure switch for the Carrier OEM Carrier Furnace Pressure Switch 0.18 WC — PY3GNAA42090NA. 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 Carrier OEM Carrier Furnace Pressure Switch 0.18 WC — PY3GNAA42090NA?
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 Carrier 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 Carrier 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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