OEM Carrier High Pressure Switch 395/295 PSI — HK02ZA395 for Model PY2PNB030040AA

This OEM high pressure switch (part number HK02ZA395) is the factory-specified refrigerant safety switch for the Carrier PY2PNB030040AA heat pump system. Manufactured by Sensata, this SPST pressurestat continuously monitors refrigerant circuit pressure and opens the safety circuit when system pressure exceeds the factory set limit, protecting the compressor from catastrophic high-side failure. Common failure symptoms include nuisance high-pressure lockouts, the system short-cycling immediately after startup, or the unit shutting down with a high-pressure fault code even when refrigerant charge appears normal — often caused by a switch that has drifted out of calibration or a failed internal diaphragm.

• Specs: Opens at 395 PSI | Closes at 295 PSI | SPST configuration | 24V / 2A rated | 42" lead length | Quick-connect electrical termination | 1/8"-NPT fine thread refrigerant port | Manufacturer: Sensata (Carrier Factory Authorized)
• OEM vs Generic: This OEM Carrier pressurestat is factory-calibrated to open and close at exact PSI thresholds. Off-brand alternatives frequently exhibit ±5–10% pressure variance, risking either nuisance trips or — more dangerously — failing to open during a true high-pressure event and allowing compressor damage.
• Install difficulty: 2/5 — Requires recovery of system refrigerant charge before replacing the switch. Tools needed: refrigerant recovery unit, manifold gauge set, adjustable wrench or 1-1/16" open-end wrench, multimeter for continuity verification. Always photograph wiring and tag leads before disconnecting. EPA 608 certification required for refrigerant handling.
• Warranty: 1-year OEM factory warranty. In stock — ships same business day from our warehouse.

Compatibility: Direct OEM replacement for Carrier model PY2PNB030040AA. Also supersedes legacy Carrier/ICP part numbers 312926-217, 71267D1, HK02ZA380, HK02ZA396, HK02ZA400, HK02ZA401, HK02ZA435, HK02ZA500, and HK02ZA501. Verify refrigerant port thread size and PSI rating on your unit's data plate before ordering. Not sure if this is the right switch? Our HVAC parts specialists verify fitment before you order — contact us today.