{"product_id":"payne-pa13nr048000acaa-pressure-switch-jria74","title":"OEM Payne Pressure Switch High \u0026 Low for PA13NR048000ACAA","description":"\u003ch1\u003eOEM Payne High \u0026amp; Low Pressure Switch for Model PA13NR048000ACAA\u003c\/h1\u003e\u003cp\u003eThese OEM pressure switches — \u003cstrong\u003eHK02ZA395 (High Pressure Switch)\u003c\/strong\u003e and \u003cstrong\u003eHK02ZB028 (Low Pressure Switch)\u003c\/strong\u003e — are the factory-specified replacements for the \u003cstrong\u003ePayne PA13NR048000ACAA\u003c\/strong\u003e split-system heat pump. Pressure switches monitor refrigerant-side pressures and send a safety signal to the control board to prevent operation under unsafe high- or low-pressure conditions. When either switch fails or trips and won't reset, the system will lock out, refuse to start, or cycle off almost immediately after startup — symptoms often misdiagnosed as a refrigerant or control board issue.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e HK02ZA395 — High Pressure Switch (opens on high-side overpressure) | HK02ZB028 — Low Pressure Switch (opens on low-side loss of pressure) | Factory-calibrated setpoints | Spade terminal connections | Direct OEM replacement, no modification required\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e OEM switches are calibrated to exact factory pressure setpoints for the PA13NR048000ACAA refrigerant circuit. Generic alternatives often carry wider pressure tolerances that can allow unsafe operating conditions or cause nuisance trips, shortening compressor life.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall Difficulty: 3\/5\u003c\/strong\u003e — Refrigerant-side pressure switch replacement requires recovering and isolating refrigerant pressure before disconnecting. Tools needed: multimeter, 1\/4\" nut driver, needle-nose pliers, manifold gauge set. Always verify system pressure has been relieved before removing the switch body. Recommend a certified HVAC technician for this repair.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e 1-year OEM factory warranty on both switches. Orders placed before cutoff ship same business day from our warehouse.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eCompatibility:\u003c\/strong\u003e Engineered specifically for the \u003cstrong\u003ePayne PA13NR048000ACAA\u003c\/strong\u003e 4-ton 13 SEER single-stage split-system heat pump. Verify your unit's data plate and existing switch markings match part numbers HK02ZA395 or HK02ZB028 before ordering. Both high and low pressure switches are available — select the correct switch for your failure. Our fitment team is available to confirm compatibility before you buy — don't guess on a safety component. \u003cstrong\u003eIn stock and ready to ship today.\u003c\/strong\u003e\u003c\/p\u003e","brand":"Payne","offers":[{"title":"OEM","offer_id":62909088104819,"sku":"PAYNE-PA13NR048000ACAA-PRESSURE_SWITCH-HK02ZA395","price":43.95,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62909088137587,"sku":"PAYNE-PA13NR048000ACAA-PRESSURE_SWITCH-HK02ZA395-GEN","price":38.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0984\/1190\/5395\/files\/nhvac-pressure-switch-HK02ZA395_8feb50ad-9113-43b7-9f8e-b6cf7bbd489d.jpg?v=1780718419","url":"https:\/\/nationalhvacparts.com\/products\/payne-pa13nr048000acaa-pressure-switch-jria74","provider":"National HVAC Parts","version":"1.0","type":"link"}