OEM Carrier High Pressure Switch HK02ZA395 — 395/295 PSI for Model PY2PPB042090AB

This is the genuine OEM factory-specified high pressure switch for the Carrier PY2PPB042090AB packaged unit. The high pressure switch is a critical refrigerant-circuit safety device that monitors compressor discharge pressure and cuts power to the compressor when pressure exceeds safe operating limits. When this switch fails or drifts out of calibration, you'll typically experience nuisance high-pressure lockouts, a system that trips on a warm day and won't restart, or — if the switch has failed open — a compressor that runs unprotected against dangerously high head pressure.

• Specs: Opens at 395 PSI | Closes at 295 PSI | 1/8" NPT thread connection | 240 VAC rated | Sensata PS80-03-0018 platform | SPST contact configuration
• OEM vs Generic: This OEM switch is factory-calibrated to exact Carrier cut-out and cut-in pressures. Aftermarket substitutes often carry wider pressure tolerances, risking either premature nuisance trips or, more dangerously, insufficient compressor protection at true high-pressure events.
• Install difficulty: 3/5 — Refrigerant circuit work requires an EPA 608 certification. Tools needed: manifold gauge set, 1/8" NPT wrench, multimeter for continuity verification before recharging. Always recover refrigerant, relieve pressure, and confirm the new switch reads closed at ambient before closing the circuit.
• Warranty: 1-year OEM factory warranty against defects. Ships same business day from our warehouse when ordered before 3 PM local time.

Compatibility: Direct OEM replacement for Carrier model PY2PPB042090AB. This switch also supersedes legacy part numbers including 312926-217, 71267D1, HK02ZA380, HK02ZA396, and HK02ZA400 — verify your unit's data plate and existing switch markings before ordering. Questions about fitment? Our HVAC parts specialists confirm compatibility before you buy.