OEM Carrier High Pressure Switch HK02ZA395 — 395/295 PSI for Model PY2PNB024040AB

This is the factory-specified OEM high pressure switch (part number HK02ZA395) for the Carrier PY2PNB024040AB packaged heat pump unit. The high pressure switch is a critical refrigerant-circuit safety device: it monitors system discharge pressure and interrupts the compressor circuit if pressure exceeds the safe threshold. When it fails or trips, the system locks out on a high-pressure fault, the compressor shuts down unexpectedly, or the unit won't cool or heat at all — even when pressures appear normal.

• Specs: Opens at 395 PSI | Closes at 295 PSI | 240 VAC, 6(6)A rated | 1/8" NPT fine-thread refrigerant port | SPST normally-closed | Sensata PS80-03-0018 / HK02ZA395A
• OEM vs Generic: This is a genuine Carrier Factory Authorized Part manufactured by Sensata to exact cut-out and cut-in tolerances. Aftermarket pressure switches frequently carry ±10–15 PSI deviation, which risks either nuisance tripping or — more dangerously — failing to protect the compressor from true over-pressure events.
• Install difficulty: 3/5 — Refrigerant recovery is required before replacing this switch. Tools needed: manifold gauge set, recovery machine, refrigerant certified technician (EPA 608), 1" open-end wrench, and a multimeter to verify continuity post-install. Always verify system pressures are normal before condemning the switch alone.
• Warranty: 1-year OEM factory warranty against defects. Ships same business day from our warehouse in original Carrier packaging.

Compatibility: Direct OEM replacement for Carrier model PY2PNB024040AB packaged heat pump units. This switch also supersedes legacy part numbers 312926-217, 71267D1, HK02ZA380, HK02ZA396, HK02ZA400, HK02ZA401, HK02ZA435, HK02ZA500, and HK02ZA501 — verify your unit's existing switch PSI rating on the data plate before ordering. Have a compatibility question? Our HVAC parts specialists verify fitment before you buy. Order now — in stock and ships today.