OEM Carrier Pressure Switch 7 PSI Open / 22 PSI Close for Model PH1REA090000AAWA

This OEM Carrier pressure switch (part number HK02ZB044) is the factory-specified replacement for the Carrier PH1REA090000AAWA packaged heat pump unit. The pressure switch monitors refrigerant or inducer pressure and acts as a safety interlock — it must confirm proper pressure conditions before allowing the system to proceed through its heating or cooling sequence. When this switch fails or becomes stuck, the unit will typically lock out before ignition or cooling begins, displaying a fault code or simply refusing to run despite the thermostat calling for conditioned air.

• Specs: 7 PSI open / 22 PSI close | 50" wire leads | 24V control circuit | Round diaphragm-type switch | Country of origin: Mexico
• OEM vs Generic: This is a genuine Carrier OEM part engineered to exact factory pressure differentials. Aftermarket substitutes often carry wider pressure tolerances, which can cause nuisance lockouts or — worse — fail to protect the system during low-pressure fault conditions.
• Install difficulty: 2/5 — Shut down power and confirm zero pressure before disconnecting leads. Tools needed: 1/4" nut driver, needle-nose pliers, and a multimeter to verify switch continuity before reinstallation. Photograph wiring and lead orientation before removal.
• Warranty: 1-year OEM manufacturer warranty. Ships same business day from our warehouse when ordered before 3 PM local time.

Compatibility: Designed for the Carrier PH1REA090000AAWA packaged heat pump unit. Always verify the pressure rating on your existing switch's data label before ordering to confirm this is the correct specification for your application. Our HVAC parts specialists are available to verify fitment — contact us before you order if you have any questions.