{"product_id":"payne-pa13pr048000acaa-pressure-switch-jria74","title":"OEM Payne Pressure Switch HK02ZA395 \/ HK02ZB028 — PA13PR048000ACAA","description":"\u003ch1\u003eOEM Payne High \u0026amp; Low Pressure Switch HK02ZA395 \/ HK02ZB028 for Model PA13PR048000ACAA\u003c\/h1\u003e\u003cp\u003eThese OEM pressure switches are the factory-specified replacements for the \u003cstrong\u003ePayne PA13PR048000ACAA\u003c\/strong\u003e packaged air conditioner. The high pressure switch (HK02ZA395) and low pressure switch (HK02ZB028) monitor refrigerant pressure on both the high and low sides of the refrigeration circuit, protecting the compressor from damage caused by abnormal operating pressures. When either switch fails or trips, the system will lock out — typically preventing the unit from cooling and triggering a fault code on the control board. Common symptoms include the system not turning on, short-cycling, or displaying a pressure fault with no obvious refrigerant leak.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e High Pressure Switch — OEM Part HK02ZA395 | Low Pressure Switch — OEM Part HK02ZB028 | Factory-calibrated trip points | Designed for R-410A refrigerant systems | Direct plug-in connector fitment\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e OEM pressure switches are calibrated to exact factory trip and reset pressures. Aftermarket substitutes often use broader tolerance thresholds, risking compressor damage from under- or over-pressure conditions that go undetected.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall difficulty: 3\/5\u003c\/strong\u003e — Refrigerant must be recovered before replacing pressure switches on a live system; this work requires an EPA Section 608 certification. Tools needed: manifold gauge set, recovery machine, wire crimpers, flathead screwdriver. Always verify system pressure after reinstallation before restarting the unit.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e 1-year OEM factory warranty. 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 These pressure switches are engineered specifically for the \u003cstrong\u003ePayne PA13PR048000ACAA\u003c\/strong\u003e 4-ton packaged air conditioning unit. Confirm OEM part numbers HK02ZA395 (high) and HK02ZB028 (low) against your unit's wiring diagram or data plate before ordering. Need help confirming fitment? Our HVAC parts specialists verify compatibility before every order ships.\u003c\/p\u003e","brand":"Payne","offers":[{"title":"OEM","offer_id":62909071130995,"sku":"PAYNE-PA13PR048000ACAA-PRESSURE_SWITCH-HK02ZA395","price":43.95,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62909071163763,"sku":"PAYNE-PA13PR048000ACAA-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_68950bf7-1968-41b7-a932-95880bf41e53.jpg?v=1780718565","url":"https:\/\/nationalhvacparts.com\/products\/payne-pa13pr048000acaa-pressure-switch-jria74","provider":"National HVAC Parts","version":"1.0","type":"link"}