OEM Carrier Pressure Switch HK02ZB044 — 7 PSI Open / 22 PSI Close for Model PY1RPA090125ACWA

This is the genuine OEM Carrier pressure switch (part number HK02ZB044), the factory-specified replacement for the Carrier PY1RPA090125ACWA packaged gas/electric unit. The pressure switch is a critical safety device that monitors negative pressure created by the inducer motor. Before each ignition cycle, the furnace control board checks that the inducer has established proper airflow — if the pressure switch fails to close (or fails to open), the control board will lock out ignition entirely, leaving the system with no heat. Common failure symptoms include a system that starts then immediately goes into lockout, a flashing fault code indicating pressure switch failure, or an inducer motor running continuously with no ignition sequence ever beginning.

• Specifications: Opens at 7" W.C. | Closes at 22" W.C. | 50" lead wire harness | 24V control circuit | Factory-matched OEM tolerances | Country of Origin: Mexico
• OEM vs. Generic: This is the genuine Carrier OEM part — not an aftermarket approximation. OEM pressure switches are calibrated to exact W.C. ratings for your specific inducer and heat exchanger. Off-spec generic switches can cause nuisance lockouts or, worse, fail to detect a blocked flue, creating a safety hazard.
• Install Difficulty: 2/5 — A straightforward swap requiring no special tools. Tools needed: flathead screwdriver, needle-nose pliers, and a multimeter to confirm switch continuity before reinstalling the panel. Always shut off power at the disconnect before servicing. Photograph the existing wiring harness routing before disconnecting leads.
• Warranty: 1-year OEM factory warranty against defects. In-stock and ships same business day from our warehouse — get your system back online fast.

Compatibility: Engineered as a direct drop-in fit for the Carrier PY1RPA090125ACWA packaged unit. Verify your existing switch's W.C. rating (found on the switch body label) matches 7" open / 22" close before ordering. Need help confirming fitment? Our HVAC parts specialists verify compatibility before you buy — contact us today.