OEM Carrier High Pressure Switch HK02ZA395 / HK02ZB044 for Model PH2PNB030000AA

This OEM high pressure switch is the factory-specified replacement for the Carrier PH2PNB030000AA heat pump system. The high pressure switch (HK02ZA395) is a critical refrigerant-circuit safety device that monitors system pressure on the discharge side of the compressor. When refrigerant pressure exceeds the setpoint — due to a blocked condenser coil, failed fan motor, overcharge, or restricted airflow — this switch opens to cut power to the compressor and prevent catastrophic damage. A failed or out-of-spec switch typically triggers a high-pressure lockout fault, causing the system to shut down and fail to restart without a manual reset. The companion low pressure switch HK02ZB044 is also listed on this unit and monitors suction-side pressure (opens at 7 PSI, closes at 22 PSI) to protect against low-refrigerant conditions.

• Specs (HK02ZA395 — High Pressure Switch): Open setpoint: 395 PSI | Close setpoint: 295 PSI | Thread: 1/8" NPT | Rated: 240 VAC | Manufacturer: Sensata (PS80-03-0018) | Factory cross-references: 312926-217, 71267D1, HK02ZA380, HK02ZA396, HK02ZA400, HK02ZA401
• Specs (HK02ZB044 — Low Pressure Switch): Open setpoint: 7 PSI | Close setpoint: 22 PSI | Lead length: 50" | Voltage: 24V | Country of Origin: Mexico | OEM Carrier part
• OEM vs Generic: Both switches are genuine Carrier OEM parts meeting exact factory design-life testing standards. Generic aftermarket pressure switches often carry wider pressure tolerances and shorter lead sets, increasing the risk of nuisance trips or delayed safety shutoff — neither is acceptable in a refrigerant circuit.
• Install difficulty: 3/5 — Requires recovery of system refrigerant pressure before switch replacement per EPA Section 608 regulations. Tools needed: manifold gauge set, refrigerant recovery unit, adjustable wrench, multimeter (continuity test before install). Always verify wiring polarity and connector orientation. Recommended for licensed HVAC technicians.
• Warranty: 1-year OEM factory warranty. Ships same business day from our warehouse on all in-stock orders placed before cutoff.

Compatibility: Designed for the Carrier PH2PNB030000AA heat pump system. Verify your unit's data plate and current part numbers before ordering — both HK02ZA395 (high pressure) and HK02ZB044 (low pressure) are supported on this listing. Not sure which switch you need? Our HVAC parts specialists verify fitment before you order — contact us with your model and serial number.