OEM Carrier Furnace Draft Pressure Switch 0.18" WC for Model PY3GNAA60090AA

This OEM draft pressure proving switch is the factory-specified replacement for the Carrier PY3GNAA60090AA packaged gas unit. The pressure switch monitors negative pressure created by the inducer motor, confirming safe venting conditions before the control board allows ignition to proceed. When it fails or sticks open, the furnace will lock out during the heating cycle — typically before the igniter even fires — leaving you with a blinking fault code and no heat. The OEM part number is HK06WC061, superseded by HK06MB061; both are factory-authorized and interchangeable for this application.

• Specs: 0.18" W.C. (water column) setpoint | Single-port, normally open | Compatible with Honeywell IS20224-5236 cross-reference | Factory-calibrated trip point for exact inducer proof
• OEM vs Generic: OEM pressure switches are calibrated to the precise W.C. rating required by this unit. Generic switches can drift ±0.05" WC from spec, causing nuisance lockouts or — more critically — failing to detect a blocked flue, creating a safety risk.
• Install difficulty: 2/5 — Shut off power and gas before beginning. Tools needed: 1/4" nut driver, flathead screwdriver, manometer (recommended for verification). Disconnect the rubber hose from the inducer port and swap the two wire terminals — photograph wiring before disconnecting. Verify new switch trips correctly before closing up the unit.
• Warranty: 1-year OEM factory warranty. In-stock and ships same business day from our warehouse.

Compatibility: Engineered for the Carrier PY3GNAA60090AA packaged gas unit. Also fits select Bryant and Payne models sharing the 0.18" WC specification — always verify the W.C. rating on the original switch label before ordering. Need help confirming fitment? Our HVAC parts team is standing by to verify your model before you order.