OEM Carrier High Pressure Switch HK02ZA395 / HK02ZB044 for Model PH2PEB042000AB

This OEM Carrier high pressure switch (part number HK02ZA395, with companion low pressure switch HK02ZB044) is the factory-specified refrigerant safety switch for the Carrier PH2PEB042000AB heat pump or packaged unit. The high pressure switch monitors refrigerant discharge-side pressure and cuts power to the compressor when pressure exceeds a safe threshold, protecting the compressor from catastrophic failure. When it fails — either stuck open or stuck closed — you'll typically see a compressor lockout fault, an HP fault code on the control board, or a system that simply won't start the cooling or heating cycle. Replacing it with a genuine OEM switch restores factory-calibrated trip points and clears nuisance lockout codes.

• Specs — HK02ZA395 (High Pressure Switch): Opens at 395 PSI | Closes at 295 PSI | 1/8" NPT thread | Sensata PS80-03-0018 platform | 6(6)A @ 240 VAC | PMAX 41B
• Specs — HK02ZB044 (Low Pressure Switch): Opens at 7 PSI | Closes at 22 PSI | 50" leads | 24V | Country of origin: Mexico
• OEM vs Generic: OEM Carrier pressure switches are calibrated to exact factory trip points (±0 PSI tolerance). Generic aftermarket switches often carry wider pressure tolerances, leading to nuisance trips or, worse, failure to protect the compressor under actual over-pressure conditions — voiding equipment warranty.
• Install difficulty: 2/5 — Recover refrigerant before removing any pressure switch with a refrigerant-side Schrader connection. Tools needed: refrigerant recovery machine, manifold gauges, 1" open-end wrench, thread-seal tape. Always verify system pressure before re-energizing. EPA 608 certification required for refrigerant handling.
• Warranty: 1-year OEM factory warranty against defects in materials and workmanship. Ships same business day from our warehouse when ordered before 3 PM ET.

Compatibility: Engineered for Carrier model PH2PEB042000AB. Verify part number against your unit's data plate and wiring diagram before ordering. Both HK02ZA395 and HK02ZB044 are sold individually — confirm which switch (high-side or low-side) has failed before purchasing. Questions about fitment? Our HVAC parts specialists verify compatibility before you order — contact us today and get your system back up fast.