OEM Carrier High & Low Pressure Switch Kit (HK02ZA395 + HK02ZB044) for Model PH2PNB024000AA

This OEM pressure switch kit includes both the HK02ZA395 High Pressure Switch and the HK02ZB044 Low Pressure Switch — the factory-specified refrigerant safety controls for the Carrier PH2PNB024000AA heat pump system. These switches continuously monitor refrigerant circuit pressure and command a system lockout or shutdown when pressures fall outside safe operating limits. When either switch fails, the system may refuse to start, short-cycle, trip an error code, or shut down entirely to protect the compressor from damage.

• Specs — HK02ZA395 (High Pressure): Opens at 395 PSI | Closes at 295 PSI | 240 VAC | 1/8" NPT thread | OEM Sensata/RCD manufactured | Factory-matched tolerances
• Specs — HK02ZB044 (Low Pressure): Opens at 7 PSI | Closes at 22 PSI | 24V | 50" lead | SPST | Country of Origin: Mexico | Direct OEM replacement
• OEM vs Generic: Genuine Carrier OEM switches are calibrated to exact factory cut-in/cut-out pressures. Aftermarket alternatives frequently deviate from these setpoints, risking nuisance lockouts or — worse — allowing the compressor to run under dangerous pressure conditions and fail prematurely.
• Install Difficulty: 3/5 — Refrigerant circuit work must be performed by an EPA 608-certified technician. Tools needed: manifold gauge set, 1/4" flare wrench, multimeter. Always recover refrigerant before replacing the high-pressure switch. Low-pressure switch replacement requires depressurizing the low-side circuit. Photograph all wiring before disconnecting.
• Warranty: 1-year OEM factory warranty. Ships same business day from our warehouse when ordered before cutoff.

Compatibility: Engineered specifically for the Carrier PH2PNB024000AA heat pump. The HK02ZA395 replaces cross-reference part numbers including 312926-217, 71267D1, HK02ZA380, HK02ZA396, HK02ZA400, HK02ZA401, and HK02ZA435. Verify refrigerant type and PSI ratings on your unit's data plate before ordering. Our fitment team is available to confirm compatibility before you buy — order with confidence and receive fast same-day shipping.