OEM Carrier High Pressure Switch 395/295 PSI — HK02ZA395 for Model PY2PNB030040NB

This factory-authorized OEM high pressure switch (part number HK02ZA395) is the direct replacement for the Carrier PY2PNB030040NB packaged or split-system unit. The high pressure switch is a critical refrigerant-circuit safety device: it continuously monitors system discharge pressure and opens the control circuit if pressure exceeds the factory-set cutout threshold, protecting the compressor from catastrophic over-pressure failure. When this switch fails or becomes erratic, you'll typically experience nuisance high-pressure lockouts, compressor short-cycling, or a system that trips on a fault code and requires manual reset — even when refrigerant charge and airflow appear normal.

• Specs: Opens at 395 PSI | Closes (auto-reset) at 295 PSI | 240 VAC rated | 1/8" NPT thread | Sensata PS80-03-0018 platform | Cross-ref: HK02ZA395A, 406-300
• OEM vs Generic: This is a genuine Carrier Factory Authorized Part. OEM switches are factory-calibrated to exact cutout/reset tolerances — critical for compressor protection. Aftermarket alternatives often carry ±5–10% pressure tolerances, risking either premature trips or under-protection of the compressor.
• Install difficulty: 2/5 — Always recover refrigerant and depressurize the system before replacing a high pressure switch. Tools needed: refrigerant recovery unit, adjustable wrench, 1/8" NPT thread sealant (PTFE rated for refrigerant), multimeter to confirm continuity at rest. Photograph existing wiring before disconnecting spade terminals.
• Warranty: 1-year OEM factory warranty. In stock and ships same business day from our NationalHVACParts.com warehouse.

Compatibility: Designed for the Carrier PY2PNB030040NB. Also replaces legacy part numbers 312926-217, 71267D1, HK02ZA380, HK02ZA396, and several other HK02ZA-series switches — always verify PSI ratings on your unit's data plate before ordering. Our team is available to confirm fitment prior to purchase. Order today and get back up and running fast.