OEM Carrier High Pressure Switch HK02ZA395 for Model PH1ZPA042000AAAA

This OEM Carrier high pressure switch (part number HK02ZA395) is the factory-specified refrigerant-side safety switch for the Carrier PH1ZPA042000AAAA heat pump package unit. Mounted on the high-pressure side of the refrigerant circuit, this switch continuously monitors system discharge pressure and trips the circuit open if pressure exceeds safe operating limits — protecting the compressor from catastrophic failure. When this switch fails or trips and won't reset, symptoms include system lockout, compressor short-cycling, or a unit that powers on but immediately shuts down with a high-pressure fault code. A failed switch can also remain stuck-open, preventing the unit from running at all even when refrigerant pressures are normal.

• Specs: Opens at 395 PSI | Closes at 295 PSI | 1/8" NPT male thread | 240 VAC rated | Sensata PS80-03-0018 / HK02ZA395A | PMAX 41B | Compatible OEM part numbers: HK02ZA395A, P332-1103, PS80-03-0018 | Replaces: 312926-217, 71267D1, HK02ZA380, HK02ZA396, HK02ZA400, HK02ZA401, HK02ZA435, HK02ZA500, HK02ZA501
• OEM vs Generic: This is a genuine Carrier OEM part manufactured to exact factory pressure setpoints and electrical ratings. Aftermarket pressure switches frequently carry ±5–10% PSI tolerances that can cause nuisance trips or, worse, fail to protect the compressor at true over-pressure conditions. OEM is the only safe choice for a high-pressure safety switch.
• Install Difficulty: 2/5 — Always recover or isolate refrigerant pressure before disconnecting. Tools needed: 1/8" NPT tap, adjustable wrench, TEFLON tape, multimeter (to confirm switch opens/closes at rated pressure). Photograph existing wiring before removal. A trained HVAC technician is recommended for any refrigerant-side service.
• Warranty: 1-year OEM factory warranty against defects. Ships same business day from our warehouse when ordered before cutoff.

Compatibility: Engineered as a direct OEM replacement for the Carrier PH1ZPA042000AAAA packaged heat pump unit. Also note that OEM part number HK02ZB044 (Low Pressure Switch, 7 PSI open / 22 PSI close, 50" leads) is the companion low-pressure switch for this same unit and is available separately. Verify your unit's data plate and existing switch PSI markings before ordering. Questions? Our fitment team confirms compatibility before you buy — reach out anytime.