{"product_id":"carrier-ph1pnb018000aaaa-pressure-switch-jria74","title":"OEM Carrier High Pressure Switch 395\/295 PSI for PH1PNB018000AAAA","description":"\u003ch1\u003eOEM Carrier High Pressure Switch 395\/295 PSI for Model PH1PNB018000AAAA\u003c\/h1\u003e\u003cp\u003eThis OEM high pressure switch (part numbers \u003cstrong\u003eHK02ZA395\u003c\/strong\u003e and \u003cstrong\u003eHK02ZB044\u003c\/strong\u003e) is the factory-specified refrigerant-side safety control for the \u003cstrong\u003eCarrier PH1PNB018000AAAA\u003c\/strong\u003e 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.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e 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\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e 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.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall difficulty: 3\/5\u003c\/strong\u003e — 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.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e 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.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eCompatibility:\u003c\/strong\u003e Engineered as a direct OEM replacement for \u003cstrong\u003eCarrier model PH1PNB018000AAAA\u003c\/strong\u003e. 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.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62641605017971,"sku":"CARRIE-PH1PNB018000AAAA-PRESSURE_SWITCH-HK02ZA395","price":60.95,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62641605083507,"sku":"CARRIE-PH1PNB018000AAAA-PRESSURE_SWITCH-HK02ZA395-GEN","price":52.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0984\/1190\/5395\/files\/nhvac-pressure-switch-HK02ZA395_2bd0c98b-fa3f-4197-8205-bf431f48ca6e.jpg?v=1775033213","url":"https:\/\/nationalhvacparts.com\/products\/carrier-ph1pnb018000aaaa-pressure-switch-jria74","provider":"National HVAC Parts","version":"1.0","type":"link"}