{"product_id":"payne-pa10pa03600gagaa-pressure-switch-jria74","title":"OEM Payne Pressure Switch High\/Low for PA10PA03600GAGAA","description":"\u003ch1\u003eOEM Payne High \u0026amp; Low Pressure Switch for Model PA10PA03600GAGAA\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 PA10PA03600GAGAA\u003c\/strong\u003e packaged air conditioning unit. Pressure switches monitor refrigerant circuit pressures to protect the compressor from unsafe operating conditions. When either switch trips or fails, the system will lock out before completing the cooling cycle, often displaying a fault code or simply refusing to run. Common symptoms include the unit shutting down immediately after startup, nuisance lockouts, or a compressor that won't energize despite a call for cooling.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e HK02ZA395 — High Pressure Switch, factory-calibrated cutout set point | HK02ZB028 — Low Pressure Switch, factory-calibrated cutout set point | Both rated for R-410A refrigerant systems | OEM snap-action switch design for reliable operation\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e OEM pressure switches are calibrated to exact factory set points for the PA10PA03600GAGAA refrigerant circuit. Aftermarket substitutes frequently carry wider pressure tolerances, risking compressor damage or nuisance trips under normal operating conditions.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall difficulty: 3\/5\u003c\/strong\u003e — Refrigerant circuit work must be performed by an EPA Section 608 certified technician. Tools needed: manifold gauge set, refrigerant recovery equipment, adjustable wrench, multimeter. Always verify system pressure is relieved before disconnecting switch leads, and photograph wiring before removal.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e 1-year OEM factory warranty on both switches. Orders received by 3 PM local time ship same business day from our HVAC-dedicated warehouse.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eCompatibility:\u003c\/strong\u003e Both HK02ZA395 and HK02ZB028 are direct OEM replacements for the Payne \u003cstrong\u003ePA10PA03600GAGAA\u003c\/strong\u003e 3-ton packaged R-410A air conditioning unit. Verify your existing switch part number against your unit's wiring diagram or data plate before ordering to confirm high-pressure vs. low-pressure application. Need help confirming fitment? Our technical team verifies part compatibility before you buy — no guesswork, no returns.\u003c\/p\u003e","brand":"Payne","offers":[{"title":"OEM","offer_id":62909216981363,"sku":"PAYNE-PA10PA03600GAGAA-PRESSURE_SWITCH-HK02ZA395","price":43.95,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62909217014131,"sku":"PAYNE-PA10PA03600GAGAA-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_76058518-1ed2-4c92-9f97-ad4853a67211.jpg?v=1780718448","url":"https:\/\/nationalhvacparts.com\/products\/payne-pa10pa03600gagaa-pressure-switch-jria74","provider":"National HVAC Parts","version":"1.0","type":"link"}