OEM Carrier High Pressure Switch 395/295 PSI for Model PH1ZNA024000ACAA

This OEM high pressure safety switch is the factory-specified replacement for the Carrier PH1ZNA024000ACAA heat pump system, covering both OEM part numbers HK02ZA395 and HK02ZB044. The high pressure switch is a critical refrigerant-circuit safety device: it continuously monitors system refrigerant pressure and cuts power to the compressor the moment pressure climbs to an unsafe level. When this switch fails or drifts out of calibration, you'll experience nuisance compressor lockouts, fault codes, or — in the opposite failure mode — a compressor that keeps running despite dangerously high head pressure, risking catastrophic compressor damage.

• Specs: Opens at 395 PSI | Closes (resets) at 295 PSI | 1/8" NPT refrigerant port | 240 VAC, 6(6)A rated | Sensata PS80 platform (HK02ZA395A) | PMAX 41 Bar
• OEM vs Generic: OEM switches are factory-calibrated to exact trip and reset pressures. Off-brand substitutes routinely carry ±10–15% pressure tolerances, meaning they may not protect the compressor at the correct threshold — or may cause false lockouts that mimic refrigerant or airflow problems.
• Install difficulty: 2/5 — Always recover refrigerant before removing the switch (EPA 608 required). Tools needed: manifold gauge set, refrigerant recovery unit, 1" open-end wrench, wire terminals. Photograph wiring before disconnecting. Leak-check the port with nitrogen after installation.
• Warranty: 1-year OEM factory warranty. Ships same business day from our warehouse when ordered before 3 PM EST.

Compatibility: Designed for the Carrier PH1ZNA024000ACAA heat pump. This part also cross-references legacy Carrier part numbers including 312926-217, 71267D1, HK02ZA380, HK02ZA396, HK02ZA400, HK02ZA401, HK02ZA435, HK02ZA500, and HK02ZA501. Always verify PSI ratings on your unit's data plate before ordering. Our team is available to confirm fitment — contact us before you buy.