OEM Carrier High Pressure Switch HK02ZA395 — 406/300 PSI for Model PH1PNA030000ABBA

This is the genuine OEM factory-replacement high pressure switch for the Carrier PH1PNA030000ABBA packaged heat pump system. The high pressure switch is a critical refrigerant-side safety device that continuously monitors system discharge pressure. When refrigerant pressure rises above the cutout threshold — due to a dirty condenser coil, failed condenser fan motor, restricted airflow, or refrigerant overcharge — the switch opens the control circuit, shutting down the compressor to prevent catastrophic failure. Symptoms of a failed or tripped switch include the system locking out on high pressure fault, the compressor shutting off within minutes of startup, or the unit not cooling or heating at all while the fan continues to run.

• Specs: Opens at 406 PSI | Closes (resets) at 300 PSI | Rated 6(6)A at 240 VAC | 1/8" NPT male thread connection | Sensata PS80-03-0018 platform | PMAX 41B | CE / EN12263 / ENEC05 certified
• OEM vs Generic: This is a genuine Carrier Factory Authorized Part manufactured by Sensata to exact OEM cutout tolerances. Generic switches often carry ±5–10% PSI variance, which can allow unsafe pressure spikes or cause nuisance trips — both costly outcomes on a packaged unit compressor.
• Install difficulty: 3/5 — Requires EPA 608 certification to work on the refrigerant circuit. Tools needed: manifold gauge set, 1/8" NPT fitting, refrigerant recovery equipment, and a multimeter to confirm switch continuity. Always recover refrigerant before removing the switch and recheck system pressures after reinstallation.
• Warranty & Shipping: 1-year OEM factory warranty. Ships same business day from our warehouse. Replaces superseded part numbers: 312926-217, 71267D1, HK02ZA380, HK02ZA396, HK02ZA400, HK02ZA401, HK02ZA435, HK02ZA500, HK02ZA501, P332-1103.

Compatibility: Direct OEM fit for Carrier model PH1PNA030000ABBA packaged heat pump unit. Always verify the part number printed on your existing switch before ordering, and confirm refrigerant type and system operating pressures match. Questions about fitment? Our HVAC parts specialists verify compatibility before you order — contact us today and ship the same day.