{"product_id":"carrier-ph2pnb042000ab-pressure-switch-jria74","title":"OEM Carrier Pressure Switch Kit HK02ZA395 \u0026 HK02ZB044 — PH2PNB042000AB","description":"\u003ch1\u003eOEM Carrier High \u0026amp; Low Pressure Switch Set HK02ZA395 \/ HK02ZB044 for Model PH2PNB042000AB\u003c\/h1\u003e\u003cp\u003eThis OEM pressure switch kit contains both the \u003cstrong\u003ehigh-pressure safety switch (HK02ZA395)\u003c\/strong\u003e and the \u003cstrong\u003elow-pressure switch (HK02ZB044)\u003c\/strong\u003e factory-specified for the \u003cstrong\u003eCarrier PH2PNB042000AB\u003c\/strong\u003e heat pump. Together, these switches monitor refrigerant pressure on both the high and low sides of the refrigerant circuit. When either switch detects an out-of-range pressure condition, it opens the circuit and locks out the system to prevent compressor damage. Common failure symptoms include the unit going into lockout after startup, short-cycling within the first few minutes of operation, or a complete no-start condition with a pressure fault code on the thermostat or control board.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs — HK02ZA395 (High Pressure Switch):\u003c\/strong\u003e Opens at 395 PSI | Closes at 295 PSI | 1\/8\" NPT thread | 240 VAC | Sensata PS80-03-0018 platform | Replaces 312926-217, HK02ZA380, HK02ZA396, and related superseded part numbers\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs — HK02ZB044 (Low Pressure Switch):\u003c\/strong\u003e Opens at 7 PSI | Closes at 22 PSI | 24V | 50\" lead wire | OEM direct drop-in replacement | Made in Mexico\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e OEM Carrier pressure switches are calibrated to exact factory cut-in\/cut-out tolerances. Aftermarket alternatives frequently deviate from set-point specs, causing nuisance lockouts or, worse, allowing the compressor to operate outside safe pressure limits — risking costly compressor failure.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall difficulty: 2\/5\u003c\/strong\u003e — Recover refrigerant per EPA 608 regulations before removing either switch from the refrigerant circuit. Tools needed: refrigerant recovery machine, manifold gauge set, 1\" open-end wrench, thread seal tape, multimeter. Always verify pressure set points match unit data plate before installing. Replace both switches as a set when one fails to avoid a repeat call.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e 1-year OEM factory warranty. Ships same business day from our warehouse.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eCompatibility:\u003c\/strong\u003e This switch kit is factory-specified for the \u003cstrong\u003eCarrier PH2PNB042000AB\u003c\/strong\u003e heat pump. Verify refrigerant type and pressure ratings on your unit's data plate before ordering. Our technical team is available to confirm fitment — contact us before you order if you have any questions. In stock and ready to ship today.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62641453334899,"sku":"CARRIE-PH2PNB042000AB-PRESSURE_SWITCH-HK02ZA395","price":95.95,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62641453367667,"sku":"CARRIE-PH2PNB042000AB-PRESSURE_SWITCH-HK02ZA395-GEN","price":83.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0984\/1190\/5395\/files\/nhvac-pressure-switch-HK02ZA395_5d838c08-ded7-4eca-9f1d-68cef7835b42.jpg?v=1775038413","url":"https:\/\/nationalhvacparts.com\/products\/carrier-ph2pnb042000ab-pressure-switch-jria74","provider":"National HVAC Parts","version":"1.0","type":"link"}