{"product_id":"payne-pa13pr03600gaaaa-pressure-switch-jria74","title":"OEM Payne Pressure Switch HK02ZA395 \/ HK02ZB028 — PA13PR03600GAAAA","description":"\u003ch1\u003eOEM Payne High \u0026amp; Low Pressure Switch HK02ZA395 \/ HK02ZB028 for Model PA13PR03600GAAAA\u003c\/h1\u003e\u003cp\u003eThese OEM pressure switches are the factory-specified replacements for the \u003cstrong\u003ePayne PA13PR03600GAAAA\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 on the high and low sides of the refrigerant circuit respectively. When either switch detects an out-of-range pressure condition — caused by refrigerant loss, a blocked coil, or a failing compressor — it opens the control circuit and sends a fault signal to the control board, shutting the system down to prevent compressor damage. Common failure symptoms include the system refusing to enter heating or cooling mode, repeated short-cycling, or a fault code indicating a pressure trip with no obvious refrigerant leak present.\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 | 24V control circuit compatible | Factory-calibrated trip and reset points for R-410A refrigerant systems\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e OEM pressure switches are calibrated to exact factory trip pressures for R-410A. Generic replacements often use wider tolerance set points, risking nuisance trips or — worse — failing to protect the compressor during a true over-pressure event.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall difficulty: 3\/5\u003c\/strong\u003e — Refrigerant circuit access may be required. Tools needed: manifold gauge set, flat-head screwdriver, needle-nose pliers, multimeter for continuity check. Always recover refrigerant per EPA Section 608 regulations before disconnecting pressure switch lines. Photograph all wiring before removal.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e 1-year OEM factory warranty on both switches. Ships same business day from our warehouse when ordered before 3 PM local time.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eCompatibility:\u003c\/strong\u003e Designed specifically for the \u003cstrong\u003ePayne PA13PR03600GAAAA\u003c\/strong\u003e 3-ton R-410A split-system heat pump. Verify your existing switch part numbers (printed on the switch body label) against HK02ZA395 and HK02ZB028 before ordering. If you are unsure which switch has failed, our parts team can help you diagnose using your system's fault code — contact us before you order and we'll confirm fitment fast.\u003c\/p\u003e","brand":"Payne","offers":[{"title":"OEM","offer_id":62909075947891,"sku":"PAYNE-PA13PR03600GAAAA-PRESSURE_SWITCH-HK02ZA395","price":43.95,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62909075980659,"sku":"PAYNE-PA13PR03600GAAAA-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_bf3ad486-ca12-4fa9-abbb-a1a746af6a3b.jpg?v=1780718559","url":"https:\/\/nationalhvacparts.com\/products\/payne-pa13pr03600gaaaa-pressure-switch-jria74","provider":"National HVAC Parts","version":"1.0","type":"link"}