OEM Carrier High Pressure Switch HK02ZA395 — 395/295 PSI for Model PY2PNB042090AB

The Carrier HK02ZA395 is the factory-specified OEM high pressure safety switch for the Carrier PY2PNB042090AB packaged unit. This critical refrigerant-circuit safety device monitors system discharge pressure and cuts power to the compressor when pressure exceeds safe operating limits — protecting your compressor from catastrophic failure. A failed or out-of-calibration high pressure switch causes nuisance lockouts, compressor short-cycling, or a unit that trips on high pressure fault codes without a true refrigerant overpressure condition present.

• Specs: Opens at 395 PSI | Closes (auto-reset) at 295 PSI | 1/8" NPT male thread fitting | 240 VAC rated | 6(6)A contact rating | PMAX 41 Bar | Sensata PS80-03-0018 / HK02ZA395A cross-reference
• OEM vs Generic: This is a genuine Carrier OEM part manufactured to exact factory pressure thresholds. Generic substitutes may carry ±5–10% pressure tolerances, risking either premature nuisance trips or — more dangerously — delayed shutoff that exposes your compressor to damaging overpressure events.
• Install difficulty: 2/5 — Recover all refrigerant before removing the switch (EPA Section 608 required). Tools needed: refrigerant recovery machine, manifold gauges, adjustable wrench or 1-1/8" open-end wrench, Teflon tape. Always leak-check after reinstallation before recharging. Verify no fault codes remain after startup.
• Warranty & Shipping: 1-year OEM manufacturer warranty against defects. In stock — ships same business day from our warehouse.

Compatibility: Designed as the direct OEM replacement for Carrier model PY2PNB042090AB packaged gas/electric units. Also replaces legacy part numbers 312926-217, 71267D1, HK02ZA380, HK02ZA396, HK02ZA400, and HK02ZA401. Always verify the PSI rating on your existing switch's data label before ordering. Our HVAC parts specialists are available to confirm fitment — contact us before you order.