OEM Carrier High Pressure Switch HK02ZA395 — 406/300# for Model PH1PNA042000ABBA

This is the genuine OEM high pressure safety switch for the Carrier PH1PNA042000ABBA packaged heat pump unit. The high pressure switch continuously monitors refrigerant pressure on the high side of the refrigeration circuit. When system pressure exceeds the factory cutout threshold — caused by a blocked condenser coil, failed condenser fan motor, refrigerant overcharge, or loss of airflow — the switch opens to shut down the compressor and protect it from catastrophic damage. When this switch fails or trips and will not reset, the system will lock out on a high pressure fault, leaving you with no cooling or heating. Replacing it with a genuine OEM part ensures factory-accurate pressure setpoints and long-term reliability.

• Specs: Opens at 395 PSI | Closes at 295 PSI | 240 VAC | 6(6)A | 1/8" NPT thread connection | Sensata PS80-03-0018 body | Part No. HK02ZA395
• OEM vs Generic: Genuine Carrier OEM switches are factory-calibrated to exact cutout and cut-in pressures. Aftermarket units can carry wider tolerances, risking nuisance trips or — worse — allowing over-pressure events that shorten compressor life.
• Install Difficulty: 2/5 — Always recover refrigerant and depressurize the system before replacing any refrigerant-circuit pressure switch. Tools needed: refrigerant recovery machine, 1/8" NPT thread sealant (non-hardening), adjustable wrench, multimeter. Confirm the new switch continuity before recharging. A licensed HVAC technician is required for refrigerant handling in most jurisdictions.
• Warranty & Shipping: 1-year OEM factory warranty against defects. In stock — ships same business day from our warehouse.

Compatibility: Direct OEM replacement for Carrier PH1PNA042000ABBA packaged heat pump units. This part also cross-references to legacy part numbers 312926-217, 71267D1, HK02ZA380, HK02ZA396, 19240027, HK02ZA400, 312926-225, 312926-226, and HK02ZA401 — always verify the open/close pressure rating on your unit's data plate before ordering. Our fitment team is available to confirm compatibility before you buy.