OEM Carrier High Pressure Switch HK02ZA395 — 395/295 PSI for Model PY2PNB042090AA

This is the genuine OEM factory-specified high pressure switch for the Carrier PY2PNB042090AA packaged heat pump unit. The high pressure switch is a critical refrigerant-circuit safety device that monitors system pressure on the high side of the refrigerant loop. When refrigerant pressure climbs beyond safe operating limits — due to a dirty coil, blocked airflow, refrigerant overcharge, or a failing condenser fan — this switch opens at 395 PSI and interrupts the compressor circuit to prevent catastrophic compressor failure. It automatically resets when pressure drops back to 295 PSI. Typical failure symptoms include nuisance high-pressure fault codes, compressor short-cycling, or the system locking out on a high-pressure trip that cannot be cleared.

• Specs: Opens at 395 PSI | Closes at 295 PSI | 6(6)A @ 240 VAC | 1/8" NPT male thread | Quick-connect electrical terminals | Sensata PS80-03-0018 platform | PMAX 41 Bar
• OEM vs Generic: This is a genuine Carrier Factory Authorized Part, manufactured by Sensata to exact Carrier pressure tolerances. Generic switches may have looser setpoint tolerances, risking either nuisance trips or — more dangerously — failure to open at the correct pressure, exposing your compressor to damaging over-pressure conditions.
• Install difficulty: 2/5 — Recover all refrigerant per EPA 608 regulations before removing the switch. Tools needed: refrigerant recovery machine, manifold gauges, adjustable wrench, thread tape, multimeter. Always verify the new switch continuity before recharging. This repair is best performed by a licensed HVAC technician.
• Warranty: 1-year OEM factory warranty. In-stock and ships same business day from our warehouse.

Compatibility: Direct OEM replacement for Carrier PY2PNB042090AA packaged heat pump units. Also replaces legacy part numbers 312926-217, 71267D1, HK02ZA380, HK02ZA396, HK02ZA400, HK02ZA401, HK02ZA435, HK02ZA500, and HK02ZA501. Confirm the PSI setpoints on your existing switch's data label before ordering. Need fitment help? Our team verifies compatibility before you buy — contact us today.