{"product_id":"payne-pa13pr036000aaaa-pressure-switch-jria74","title":"OEM Payne Pressure Switch High\/Low for PA13PR036000AAAA","description":"\u003ch1\u003eOEM Payne High \u0026amp; Low Pressure Switch for Model PA13PR036000AAAA\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 PA13PR036000AAAA\u003c\/strong\u003e heat pump. Pressure switches are safety devices that monitor refrigerant pressure on both the high and low sides of the system. They signal the control board to allow or interrupt operation based on whether pressures fall within safe operating ranges. When either switch fails, the system may lock out entirely, short-cycle, or refuse to enter a heating or cooling call, often with no obvious mechanical noise to indicate trouble.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e HK02ZA395 — High Side Pressure Switch | HK02ZB028 — Low Side Pressure Switch | 24V control circuit | Factory-calibrated pressure setpoints for R-410A systems | OEM-matched electrical connectors for direct plug-in replacement\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e OEM pressure switches are calibrated to exact factory cutout and cut-in pressures for this unit. Generic alternatives may use broader pressure thresholds, risking nuisance lockouts or, worse, allowing the compressor to run under unsafe refrigerant conditions that shorten its service life.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall difficulty: 3\/5\u003c\/strong\u003e — Refrigerant pressure must be verified with a manifold gauge set before condemning a pressure switch. Depressurize the relevant circuit before disconnecting. Tools needed: manifold gauge set, multimeter, screwdriver, needle-nose pliers. Always photograph wiring before disconnecting and confirm new switch orientation matches original.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e 1-year OEM factory warranty on both switches. Orders ship same business day from our warehouse when placed before cutoff.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eCompatibility:\u003c\/strong\u003e Designed specifically for the \u003cstrong\u003ePayne PA13PR036000AAAA\u003c\/strong\u003e 3-ton R-410A heat pump. Both OEM part numbers HK02ZA395 and HK02ZB028 are listed for this model — confirm whether you need the high-side, low-side, or both switches by testing each with a multimeter across the terminals under a live call. Not sure which switch has failed? Our HVAC parts team can help verify fitment and isolate the faulty component before you order. \u003cstrong\u003eIn stock — ships today.\u003c\/strong\u003e\u003c\/p\u003e","brand":"Payne","offers":[{"title":"OEM","offer_id":62909078208883,"sku":"PAYNE-PA13PR036000AAAA-PRESSURE_SWITCH-HK02ZA395","price":43.95,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62909078241651,"sku":"PAYNE-PA13PR036000AAAA-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_806f1ce8-cc22-499f-b401-60f16dfa0fc8.jpg?v=1780718507","url":"https:\/\/nationalhvacparts.com\/products\/payne-pa13pr036000aaaa-pressure-switch-jria74","provider":"National HVAC Parts","version":"1.0","type":"link"}