{"product_id":"payne-pa10ja04800macaa-pressure-switch-jria74","title":"OEM Payne Pressure Switch High\/Low for PA10JA04800MACAA","description":"\u003ch1\u003eOEM Payne High \u0026amp; Low Pressure Switch for Model PA10JA04800MACAA\u003c\/h1\u003e\u003cp\u003eThese OEM pressure switches are the factory-specified replacements for the \u003cstrong\u003ePayne PA10JA04800MACAA\u003c\/strong\u003e packaged air conditioning unit. The pressure switches — \u003cstrong\u003eHK02ZA395 (High Pressure Switch)\u003c\/strong\u003e and \u003cstrong\u003eHK02ZB028 (Low Pressure Switch)\u003c\/strong\u003e — monitor refrigerant circuit pressures and send a signal to the control board to allow or interrupt system operation. When either switch fails or sticks open, the system will typically lock out before completing a cooling cycle, trigger a fault code, or refuse to start altogether. A failed high-pressure switch may cause nuisance trips on hot days, while a failed low-pressure switch often points to refrigerant loss or an evaporator freeze condition.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e HK02ZA395 — High Pressure Switch, factory-calibrated cutout pressure | HK02ZB028 — Low Pressure Switch, factory-calibrated cutout pressure | OEM-matched electrical connectors for direct plug-in replacement | Rated for R-410A refrigerant systems\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e OEM pressure switches are factory-calibrated to the exact cutout and reset pressures specified for the PA10JA04800MACAA. Generic switches often carry wider pressure tolerances, which can cause nuisance trips, missed fault conditions, or accelerated compressor wear over time.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall difficulty: 3\/5\u003c\/strong\u003e — Refrigerant circuit work requires EPA 608 certification. Tools needed: manifold gauge set, multimeter, adjustable wrench, and safety glasses. Always recover refrigerant per EPA regulations before replacing switches on the high- or low-side lines. Verify system pressures after reinstallation.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e 1-year OEM factory warranty on both HK02ZA395 and HK02ZB028. Orders placed by 3 PM 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 PA10JA04800MACAA\u003c\/strong\u003e packaged air conditioner (4-ton, R-410A). Confirm your existing switch part numbers — HK02ZA395 or HK02ZB028 — against your unit's data plate or wiring diagram before ordering. Need fitment verification? Our HVAC parts specialists confirm compatibility before you buy. \u003cstrong\u003eIn stock — ships today.\u003c\/strong\u003e\u003c\/p\u003e","brand":"Payne","offers":[{"title":"OEM","offer_id":62909223076211,"sku":"PAYNE-PA10JA04800MACAA-PRESSURE_SWITCH-HK02ZA395","price":43.95,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62909223108979,"sku":"PAYNE-PA10JA04800MACAA-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_1ccaf246-34f9-4b1e-834c-ca59412920cb.jpg?v=1780718441","url":"https:\/\/nationalhvacparts.com\/products\/payne-pa10ja04800macaa-pressure-switch-jria74","provider":"National HVAC Parts","version":"1.0","type":"link"}