OEM Carrier High Pressure Switch HK02ZA395 for Model PH2PNB036000AA

This OEM high pressure switch is the factory-specified replacement for the Carrier PH2PNB036000AA packaged heat pump unit. The pressure switch monitors refrigerant pressure and proves safe operating conditions before allowing the system to proceed through its control sequence. When this switch fails or drifts out of calibration, the system will typically lock out before completing a heating or cooling cycle — often with a diagnostic fault code pointing to high-pressure or pressure-switch circuit failure. Both OEM part numbers HK02ZA395 (High Pressure Switch) and HK02ZB044 (Pressure Switch) are covered by this listing.

• Specs: 24V control circuit | Cut-In: 7 PSI | Cut-Out: 22 PSI | 50" lead wire | SPST normally open configuration | OEM factory-matched pressure setpoints
• OEM vs Generic: OEM pressure switches are calibrated to Carrier's exact cut-in and cut-out tolerances. Aftermarket substitutes often carry ±15% pressure variance, which can cause nuisance lockouts or — worse — fail to protect the compressor from damaging high-pressure events.
• Install difficulty: 2/5 — Disconnect power and recover refrigerant per EPA 608 regulations before accessing the high-side pressure port. Tools needed: 5/16" nut driver, needle-nose pliers, manifold gauge set. Always photograph existing wiring and tubing routing before removal.
• Warranty: 1-year OEM factory warranty against defects. Ships same business day from our warehouse when ordered before cutoff.

Compatibility: Designed for the Carrier PH2PNB036000AA packaged heat pump unit. Verify pressure setpoints on your unit's wiring diagram or data plate before ordering. Our fitment team is available to confirm compatibility — contact us before you buy if you have any questions.