{"product_id":"payne-pa13nr018000ahaa-pressure-switch-jria74","title":"OEM Payne Pressure Switch HK02ZA395 \/ HK02ZB028 — PA13NR018000AHAA","description":"\u003ch1\u003eOEM Payne High \u0026amp; Low Pressure Switch for Model PA13NR018000AHAA\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 PA13NR018000AHAA\u003c\/strong\u003e split-system heat pump. Pressure switches monitor refrigerant circuit pressures on both the high and low sides to protect the compressor from operating outside safe limits. When either switch fails or trips, the system will lock out before completing a heating or cooling cycle, often displaying a fault code and refusing to run until the fault is cleared. Common symptoms include the system shutting down immediately after startup, short-cycling, or never advancing past the call-for-cooling\/heating stage.\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 matched to R-410A refrigerant operating pressures | Direct plug-in connector for the PA13NR018000AHAA control board harness\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e OEM pressure switches are calibrated to exact factory trip-point tolerances for R-410A systems. Generic alternatives often use wider pressure 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 pressure must be verified by a certified EPA 608 technician before replacing pressure switches on a live system. Tools needed: manifold gauge set, flathead screwdriver, needle-nose pliers, multimeter. Always de-energize the unit at the disconnect before handling any components.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e 1-year OEM factory warranty against defects in materials and workmanship. Orders placed before 3 PM ship same business day from our warehouse.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eCompatibility:\u003c\/strong\u003e Designed specifically for the \u003cstrong\u003ePayne PA13NR018000AHAA\u003c\/strong\u003e 1.5-ton split-system heat pump. Verify the failed switch using your system's fault code and cross-reference both OEM part numbers (HK02ZA395 and HK02ZB028) against your unit's wiring diagram before ordering. Not sure which switch you need? Our HVAC parts specialists verify fitment before you buy — reach out via chat or phone.\u003c\/p\u003e","brand":"Payne","offers":[{"title":"OEM","offer_id":62909143449971,"sku":"PAYNE-PA13NR018000AHAA-PRESSURE_SWITCH-HK02ZA395","price":43.95,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62909143482739,"sku":"PAYNE-PA13NR018000AHAA-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_1e316056-e406-4fc1-95ae-2ac41919cced.jpg?v=1780718548","url":"https:\/\/nationalhvacparts.com\/products\/payne-pa13nr018000ahaa-pressure-switch-jria74","provider":"National HVAC Parts","version":"1.0","type":"link"}