{"product_id":"payne-pa10pa03600gaaaa-pressure-switch-jria74","title":"OEM Payne Pressure Switch High\/Low for PA10PA03600GAAAA","description":"\u003ch1\u003eOEM Payne High \u0026amp; Low Pressure Switch for Model PA10PA03600GAAAA\u003c\/h1\u003e\u003cp\u003eThese OEM pressure switches are the factory-specified replacements for the \u003cstrong\u003ePayne PA10PA03600GAAAA\u003c\/strong\u003e packaged air conditioning unit. The pressure switches monitor refrigerant pressure on both the high and low sides of the system, protecting the compressor from damage caused by abnormal operating pressures. When either switch fails or trips, the system will lock out, refuse to start the compressor, or shut down mid-cycle — often displaying a fault code on the control board. Common symptoms include the unit failing to cool, short-cycling, or tripping a fault immediately after startup.\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 OEM wiring harness\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e OEM pressure switches use factory-calibrated setpoints engineered specifically for this Payne unit. Aftermarket switches may use broader tolerance bands, risking nuisance trips or — worse — failing to protect the compressor under true fault conditions.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall difficulty: 2\/5\u003c\/strong\u003e — Disconnect power before servicing. Note: high-side refrigerant pressure may be present at the high pressure switch port; licensed technicians should verify system pressure before disconnecting. Tools needed: flathead screwdriver, needle-nose pliers, multimeter. Photograph all wiring connections before removal.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e 1-year OEM factory warranty against defects. Orders placed by 3 PM EST ship same business day from our warehouse.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eCompatibility:\u003c\/strong\u003e Engineered for the \u003cstrong\u003ePayne PA10PA03600GAAAA\u003c\/strong\u003e 3-ton packaged air conditioning unit. Verify the failed switch (high-side HK02ZA395 or low-side HK02ZB028) using your unit's fault code and wiring diagram before ordering — both are available individually. Questions about fitment? Our HVAC parts specialists confirm compatibility before you buy.\u003c\/p\u003e","brand":"Payne","offers":[{"title":"OEM","offer_id":62909217571187,"sku":"PAYNE-PA10PA03600GAAAA-PRESSURE_SWITCH-HK02ZA395","price":43.95,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62909217603955,"sku":"PAYNE-PA10PA03600GAAAA-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_27ea2740-83f5-43fe-8bc4-02f7c624b4e1.jpg?v=1780718446","url":"https:\/\/nationalhvacparts.com\/products\/payne-pa10pa03600gaaaa-pressure-switch-jria74","provider":"National HVAC Parts","version":"1.0","type":"link"}