OEM Carrier High Pressure Switch 448/327 PSI for Model PY1RJA048115AAWA

This OEM high pressure switch is the factory-specified safety component for the Carrier PY1RJA048115AAWA heat pump system. Rated at 448 PSI open / 327 PSI close, it continuously monitors refrigerant circuit pressure and instantly cuts power to the compressor when unsafe high-side pressure is detected — protecting the compressor from catastrophic damage. Common failure symptoms include nuisance tripping, the system locking out on a high-pressure fault, or the compressor shutting down shortly after startup even when refrigerant charge and airflow appear normal.

• Specs: 448 PSI open / 327 PSI close | Dimensions: 4.1" L × 4.0" W × 0.4" H | Weight: 0.19 lbs | OEM Part Numbers: HK02ZA442 (High Pressure Switch) & HK02ZB044 (Pressure Switch) | Factory-matched switching tolerance
• OEM vs Generic: OEM Carrier pressure switches are manufactured to exact factory switching setpoints. Aftermarket substitutes often carry wider pressure tolerances, risking either nuisance lockouts or, more dangerously, insufficient compressor protection under true high-pressure events.
• Install difficulty: 2/5 — Recover refrigerant per EPA Section 608 regulations before disconnecting the switch if it is in a pressurized line. Tools needed: manifold gauge set, wire cutters/crimpers, multimeter (to verify continuity before reinstall), and safety glasses. Always confirm system pressure is relieved before handling. Label wires before disconnecting.
• Warranty: 1-year OEM factory warranty. In-stock units ship the same business day from our warehouse.

Compatibility: Direct OEM replacement for Carrier model PY1RJA048115AAWA. Cross-references OEM part numbers HK02ZA442 and HK02ZB044. Verify the pressure setpoints on your unit's data plate (448 PSI open / 327 PSI close) before ordering to ensure correct fitment. Have your model number ready — our HVAC parts specialists verify fitment before every order ships.