OEM Carrier High Pressure Switch 395/295 PSI — HK02ZA395 for Model PY2PNB036090AA

This genuine OEM Carrier high pressure switch (part number HK02ZA395) is the factory-specified replacement for the Carrier PY2PNB036090AA packaged unit. The high pressure switch is a critical refrigerant-circuit safety device: it continuously monitors compressor discharge pressure and opens the control circuit if refrigerant pressure climbs to a dangerous level. When this switch fails or trips, the system will shut down on high-pressure lockout — often misdiagnosed as a control board or thermostat fault. A properly functioning switch protects your compressor from catastrophic over-pressure damage.

• Specs: Opens at 395 PSI | Closes at 295 PSI | 1/8" NPT thread | 240 VAC rated | Sensata PS80-03-0018 platform | Replaces legacy part numbers including 312926-217, 71267D1, HK02ZA380, HK02ZA396, HK02ZA400, and HK02ZA401
• OEM vs Generic: This is a genuine Carrier OEM part built to exact factory pressure setpoints (±1% tolerance). Aftermarket alternatives can carry wider pressure tolerances, leading to false trips or — more dangerously — failure to open under true over-pressure conditions, risking compressor failure.
• Install difficulty: 2/5 — Recover refrigerant charge before replacing this switch (EPA 608 certification required). Tools needed: refrigerant recovery machine, manifold gauge set, 1" open-end wrench, thread seal tape. Always verify the switch is the root cause by checking system pressures and confirming the switch is open with a multimeter before replacement.
• Warranty: 1-year OEM factory warranty against defects in materials and workmanship. In-stock and ships same business day from our warehouse.

Compatibility: Engineered as a direct OEM replacement for Carrier model PY2PNB036090AA. Verify your unit's existing pressure switch PSI setpoints against your data plate before ordering. Not sure it fits? Our HVAC parts specialists confirm fitment before you buy — order with confidence.