OEM Carrier High Pressure Switch HK02ZA395 — 395/295 PSI for Model PY2PNB042060AA

This OEM high pressure switch (part number HK02ZA395) is the factory-specified refrigerant safety device for the Carrier PY2PNB042060AA packaged unit. Mounted in the high-side refrigerant circuit, the switch continuously monitors system discharge pressure. When pressure exceeds the factory cutout threshold, it opens the control circuit and shuts the compressor down to prevent catastrophic damage. Common failure symptoms include nuisance high-pressure lockouts, fault codes indicating refrigerant over-pressure, or a compressor that trips out repeatedly even when refrigerant charge and airflow appear normal — often caused by a switch that has drifted out of calibration or developed an intermittent open contact.

• Specs: Cutout (open) at 395 PSI | Reset (close) at 295 PSI | 1/8" NPT male fitting | 240 VAC rated | SPST normally closed | Sensata PS80-03-0018 platform | Cross-references: 312926-217, 71267D1, HK02ZA380, HK02ZA396, HK02ZA400, HK02ZA401
• OEM vs Generic: This is a genuine Carrier OEM switch manufactured to exact factory pressure tolerances. Aftermarket switches commonly carry wider pressure tolerances, which can allow the compressor to operate above safe limits — potentially voiding equipment warranties and causing compressor failure.
• Install Difficulty: 3/5 — Refrigerant circuit work. Requires EPA 608 certification to access the high-side service port. Tools needed: refrigerant gauges, adjustable wrench, 1/8" NPT sealant or copper crush washer. Always recover refrigerant per EPA regulations before replacing. Confirm system pressure has equalized before removal.
• Warranty: 1-year OEM factory warranty against defects. Ships same business day from our stocked warehouse.

Compatibility: Engineered for the Carrier PY2PNB042060AA packaged gas/electric unit. Also cross-references several legacy Carrier, Bryant, and Payne high-pressure switch part numbers (see specs above). Verify your existing switch's PSI rating and fitting size on the data plate or existing switch body before ordering. Have questions about fitment? Our HVAC parts specialists are available to confirm compatibility before you buy — call or chat today.