OEM Carrier Pressure Switch HK02ZB044 for Model PY1RPA090180ACWB

This is the factory OEM replacement pressure switch (part number HK02ZB044) for the Carrier PY1RPA090180ACWB packaged unit. The pressure switch monitors the inducer motor's draft by sensing negative air pressure through a rubber hose connected to the inducer housing. When the inducer establishes proper airflow, the switch closes to allow the ignition sequence to proceed. If it fails or sticks open, the control board will lock out before any ignition attempt — resulting in a no-heat condition with a pressure switch fault code on the board.

• Specs: Opens at 7" W.C. | Closes at 22" W.C. | 24V control circuit | 50" wire leads | Single-port sensing | Manufactured in Mexico to OEM tolerances
• OEM vs Generic: This is a genuine Carrier OEM part — factory-matched to exact pressure trip points. Generic pressure switches frequently carry ±15% tolerance on W.C. ratings, which can cause nuisance lockouts or, worse, allow the unit to run with inadequate draft, creating a safety hazard.
• Install difficulty: 2/5 — Shut off power to the unit at the disconnect before beginning. Tools needed: 1/4" nut driver, flat-head screwdriver, needle-nose pliers. Disconnect the sensing hose and two wire leads, remove the single mounting screw, and reverse for installation. Inspect the sensing hose for cracks or blockages before reinstalling.
• Warranty: 1-year OEM factory warranty. In-stock and ships the same business day from our warehouse.

Compatibility: Engineered as a direct drop-in replacement for the Carrier PY1RPA090180ACWB packaged unit. Always verify the W.C. rating stamped on your existing switch before ordering. Our fitment team is available to confirm compatibility before you place your order — no guesswork required.