OEM Carrier High Pressure Switch 395/295 PSI for Model PH1PNB018000AAAA

This OEM high pressure switch (part numbers HK02ZA395 and HK02ZB044) is the factory-specified refrigerant-side safety control for the Carrier PH1PNB018000AAAA packaged heat pump unit. Mounted on the high-side refrigerant circuit, this switch continuously monitors discharge pressure and cuts power to the compressor the moment pressure exceeds the factory set point — protecting the compressor from catastrophic over-pressure failure. When this switch fails or drifts out of calibration, you'll typically experience nuisance high-pressure lockouts, a compressor that won't start, or a system that trips on a fault code with no obvious refrigerant cause.

• Specs: Opens at 395 PSI | Closes at 295 PSI | 1/8" NPT thread connection | 240 VAC rated (6A) | Sensata PS80-03-0018 platform | SPST normally closed | Compatible part cross-reference: 312926-217, 71267D1, HK02ZA380, HK02ZA396
• OEM vs Generic: OEM Carrier switches (manufactured by Sensata) are calibrated to ±2% of the rated cut-out pressure. Generic aftermarket switches often drift ±8–12%, risking either compressor damage from under-protection or chronic nuisance lockouts from over-sensitivity.
• Install difficulty: 3/5 — Refrigerant-side work. System must be recovered before replacing this switch if it is installed in a sealed circuit. Tools required: refrigerant recovery machine, manifold gauge set, 1/8" NPT fittings, Schrader valve core tool, and torque wrench. Always verify system pressures after reinstallation before returning to service.
• Warranty: 1-year OEM factory warranty against defects in materials and workmanship. Ships same business day from our warehouse when ordered before 3 PM local time.

Compatibility: Engineered as a direct OEM replacement for Carrier model PH1PNB018000AAAA. Cross-references OEM part numbers HK02ZA395 and HK02ZB044. Always verify the cut-out and cut-in pressure ratings on your unit's data plate or wiring diagram before ordering — using an incorrect pressure rating can void your equipment warranty. Not sure it fits? Contact our team for fitment verification before you buy.