OEM Carrier High Pressure Switch 448/327 PSI for Model PY1RPA060115AAWB

This OEM high pressure switch is the factory-specified replacement for the Carrier PY1RPA060115AAWB packaged rooftop unit. The high pressure switch continuously monitors refrigerant-side pressure and opens the circuit when system pressure exceeds safe operating limits, protecting the compressor from catastrophic damage. When this switch fails or trips on nuisance faults, you'll typically see a no-cooling lockout, a high-pressure fault code on the control board, or a system that trips immediately after startup and won't reset. This listing covers both OEM part numbers: HK02ZA442 (High Pressure Switch) and HK02ZB044 (Pressure Switch), which are the factory-authorized replacements for this model.

• Specs: 448 PSI opening pressure | 327 PSI closing pressure | High-side refrigerant circuit | Replaces superseded part HK02ZA439
• OEM vs Generic: OEM switches are calibrated to exact Carrier factory pressure setpoints. Aftermarket alternatives frequently carry wider tolerances, risking nuisance trips or—worse—inadequate compressor protection that voids equipment warranties.
• Install difficulty: 3/5 — Refrigerant-side work requires an EPA 608 certified technician. Tools needed: manifold gauge set, adjustable wrench, multimeter. Recover refrigerant per local codes before disconnecting the switch. Always verify system pressure after reinstall before restarting the unit.
• Warranty: 1-year OEM factory warranty. Ships same business day from our warehouse when ordered before cutoff.

Compatibility: Engineered for the Carrier PY1RPA060115AAWB packaged rooftop unit. Verify refrigerant type and high-side pressure ratings on your unit's data plate before ordering. Our fitment team is available to confirm compatibility — contact us before you order if you have any questions. In stock and ready to ship today.