OEM Carrier High & Low Pressure Switch HK02ZA395 / HK02ZB044 for Model PH1PPB042000AAAA

This OEM pressure switch set is the factory-specified refrigerant circuit protection for the Carrier PH1PPB042000AAAA packaged heat pump unit. The high pressure switch (HK02ZA395) opens at 395 PSI and closes at 295 PSI, protecting the compressor from dangerously elevated discharge pressures caused by blocked condenser coils, failed condenser fans, or refrigerant overcharge. The low pressure switch (HK02ZB044) opens at 7 PSI and closes at 22 PSI, guarding against low-side pressure drops from refrigerant loss or a stuck TXV. When either switch trips, the system will lock out on a fault, short-cycle, or simply fail to cool — symptoms often misdiagnosed as a bad board or compressor.

• Specs — High Pressure Switch HK02ZA395: Opens @ 395 PSI | Closes @ 295 PSI | 1/8" NPT thread | 240 VAC | OEM Sensata PS80 platform | Replaces 312926-217, HK02ZA380, HK02ZA396, HK02ZA400, and others
• Specs — Low Pressure Switch HK02ZB044: Opens @ 7 PSI | Closes @ 22 PSI | 24V | 50" leads | OEM Carrier Factory Authorized Part | Country of Origin: Mexico
• OEM vs Generic: Genuine Carrier OEM pressure switches are factory-calibrated to exact cut-in and cut-out setpoints. Aftermarket substitutes frequently carry ±5–10% pressure tolerance, risking nuisance trips or — worse — allowing the compressor to run outside safe operating limits.
• Install Difficulty: 3/5 — Refrigerant-side pressure switches require recovering system pressure before replacement on some installations. Tools needed: manifold gauge set, 1/8" NPT fittings, spade terminal crimpers, and a multimeter to confirm continuity at rest. Always tag out the disconnect before servicing. Recommend verifying system pressures after reinstall to confirm switches are not nuisance-tripping.
• Warranty: 1-year OEM factory warranty. Ships same business day from our warehouse when ordered before cutoff.

Compatibility: Engineered for Carrier PH1PPB042000AAAA packaged heat pump units. Verify your unit's data plate and existing switch setpoints before ordering — confirm 395/295 PSI for the high side and 7/22 PSI for the low side. Our fitment team is available to cross-check your model before purchase. Order now — in stock and ships today.