OEM Carrier High Pressure Switch 395/295 PSI — HK02ZA395 for Model PY2PNB048090AB

This OEM high pressure switch is the factory-specified replacement for Carrier model PY2PNB048090AB packaged heat pump units. The high pressure switch is a critical refrigerant-circuit safety device: it continuously monitors system discharge pressure and opens the circuit to shut down the compressor when pressure exceeds the rated cutout threshold. When this switch fails or trips, you may experience sudden compressor shutoff, a system lockout fault code, or nuisance high-pressure trips — even when refrigerant charge and airflow are normal. A faulty switch that fails closed can mask a true high-pressure event and risk compressor or system damage.

• Specs: Open (cutout) at 395 PSI | Close (reset) at 295 PSI | 1/8" NPT thread | 240 VAC | SPST normally closed | Sensata PS80-03-0018 platform | Replaces P/N 312926-217, 71267D1, HK02ZA380, HK02ZA396, HK02ZA400, HK02ZA401
• OEM vs Generic: This is the genuine Carrier OEM part, factory-calibrated to exact open/close pressure tolerances. Aftermarket switches often carry ±5–10% pressure variance, which can result in premature trips or — more dangerously — a switch that fails to protect the compressor at true high-pressure events.
• Install difficulty: 3/5 — Requires recovering refrigerant before disconnecting the switch from the high-side refrigerant circuit. Tools needed: refrigerant recovery machine, manifold gauge set, 1/8" NPT fittings, multimeter for continuity verification post-install. This task is EPA 608 certified technician work.
• Warranty: 1-year OEM factory warranty. In-stock orders ship same business day from our warehouse.

Compatibility: Designed for Carrier model PY2PNB048090AB packaged heat pump units. Verify your existing switch's PSI ratings and thread size against your unit's data plate and wiring diagram before ordering. Our technical team is available to confirm fitment — contact us before you order if you have any questions.