OEM Carrier High Pressure Switch HK02ZA395 / HK02ZB044 for Model PH1ZNA042000AAAA

This OEM pressure switch kit covers both the High Pressure Switch (HK02ZA395) and the Pressure Switch (HK02ZB044) for the Carrier PH1ZNA042000AAAA packaged heat pump unit. The pressure switch monitors refrigerant or inducer pressure and sends a proving signal to the control board before allowing the system to proceed through its operating sequence. A failed pressure switch is one of the most common causes of system lockout — the unit will attempt to start, fail to prove pressure, and go into a fault code without ever reaching full operation.

• Specs: 24V coil voltage | 7 PSI open / 22 PSI close | 50" wire leads | OEM part numbers HK02ZA395 (High Pressure) & HK02ZB044 (Pressure Switch) | Country of Origin: Mexico
• OEM vs Generic: These are factory-original Carrier parts that meet exact design specifications for optimum system performance and preserve your equipment warranty. Generic aftermarket switches often lack the precise pressure differential calibration required for reliable operation.
• Install difficulty: 2/5 — Disconnect power before servicing. Tools needed: 1/4" nut driver, needle-nose pliers, and a multimeter to confirm switch continuity before reinstalling. Always label or photograph the existing wiring harness before disconnecting leads.
• Warranty: 1-year OEM factory warranty. In-stock and ships same business day from our warehouse.

Compatibility: Engineered specifically for the Carrier PH1ZNA042000AAAA packaged heat pump unit. Verify your model and data plate pressure ratings before ordering. Not sure which switch you need — high or standard pressure? Our HVAC parts team will confirm correct fitment before you buy. Order by 3PM local time for same-day shipping.