{"product_id":"payne-pa13pr036000ahaa-pressure-switch-jria74","title":"OEM Payne Pressure Switch HK02ZA395 \/ HK02ZB028 — PA13PR036000AHAA","description":"\u003ch1\u003eOEM Payne High \u0026amp; Low Pressure Switch HK02ZA395 \/ HK02ZB028 for Model PA13PR036000AHAA\u003c\/h1\u003e\u003cp\u003eThese OEM pressure switches are the factory-specified replacements for the \u003cstrong\u003ePayne PA13PR036000AHAA\u003c\/strong\u003e split-system heat pump. The high pressure switch (\u003cstrong\u003eHK02ZA395\u003c\/strong\u003e) and low pressure switch (\u003cstrong\u003eHK02ZB028\u003c\/strong\u003e) monitor refrigerant pressure levels on both the high and low sides of the refrigerant circuit. When either switch detects an out-of-range pressure condition, it signals the control board to shut the system down, protecting the compressor from catastrophic damage. Common failure symptoms include the system refusing to start, short-cycling immediately after startup, or a fault code indicating a pressure trip on the control board.\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 pressures | Spade terminal connections for direct OEM plug-in fitment\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e OEM pressure switches are calibrated to exact factory trip-point thresholds. Aftermarket substitutes often carry wider tolerances, risking nuisance trips or, worse, failing to protect the compressor under genuine overpressure conditions.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall difficulty: 3\/5\u003c\/strong\u003e — Refrigerant system must be verified before replacement. Isolate power at the disconnect before servicing. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter for continuity verification. Photograph all wiring connections prior to disconnecting. If refrigerant leak is suspected, consult a certified HVAC technician.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e 1-year OEM factory warranty on both switches. In-stock and ships same business day from our warehouse.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eCompatibility:\u003c\/strong\u003e Designed as direct OEM replacements for the \u003cstrong\u003ePayne PA13PR036000AHAA\u003c\/strong\u003e 3-ton split-system heat pump. Always confirm your existing switch part numbers (found on the switch body or unit data plate) match HK02ZA395 or HK02ZB028 before ordering. Not sure which switch you need? Our fitment team is ready to verify before you buy — same-day shipping available on all in-stock orders.\u003c\/p\u003e","brand":"Payne","offers":[{"title":"OEM","offer_id":62909076242803,"sku":"PAYNE-PA13PR036000AHAA-PRESSURE_SWITCH-HK02ZA395","price":43.95,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62909076275571,"sku":"PAYNE-PA13PR036000AHAA-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_fae60d00-6573-49a3-b8b5-4ace2563e639.jpg?v=1780718558","url":"https:\/\/nationalhvacparts.com\/products\/payne-pa13pr036000ahaa-pressure-switch-jria74","provider":"National HVAC Parts","version":"1.0","type":"link"}