{"product_id":"carrier-ph1zpa042000aaaa-pressure-switch-jria74","title":"OEM Carrier High Pressure Switch HK02ZA395 for PH1ZPA042000AAAA","description":"\u003ch1\u003eOEM Carrier High Pressure Switch HK02ZA395 for Model PH1ZPA042000AAAA\u003c\/h1\u003e\u003cp\u003eThis OEM Carrier high pressure switch (part number \u003cstrong\u003eHK02ZA395\u003c\/strong\u003e) is the factory-specified refrigerant-side safety switch for the \u003cstrong\u003eCarrier PH1ZPA042000AAAA\u003c\/strong\u003e 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.\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 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\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e 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.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall Difficulty: 2\/5\u003c\/strong\u003e — 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.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e 1-year OEM factory warranty against defects. Ships same business day from our warehouse when ordered before cutoff.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eCompatibility:\u003c\/strong\u003e Engineered as a direct OEM replacement for the \u003cstrong\u003eCarrier PH1ZPA042000AAAA\u003c\/strong\u003e packaged heat pump unit. Also note that OEM part number \u003cstrong\u003eHK02ZB044\u003c\/strong\u003e (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.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62641498882419,"sku":"CARRIE-PH1ZPA042000AAAA-PRESSURE_SWITCH-HK02ZA395","price":85.95,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62641498915187,"sku":"CARRIE-PH1ZPA042000AAAA-PRESSURE_SWITCH-HK02ZA395-GEN","price":74.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0984\/1190\/5395\/files\/nhvac-pressure-switch-HK02ZA395_3957a9e1-2d39-428b-8b51-8f75188b85ab.jpg?v=1775033581","url":"https:\/\/nationalhvacparts.com\/products\/carrier-ph1zpa042000aaaa-pressure-switch-jria74","provider":"National HVAC Parts","version":"1.0","type":"link"}