{"product_id":"payne-pa12na024000abaa-pressure-switch-jria74","title":"OEM Payne Pressure Switch HK02ZA395 \/ HK02ZB028 — PA12NA024000ABAA","description":"\u003ch1\u003eOEM Payne High \u0026amp; Low Pressure Switch HK02ZA395 \/ HK02ZB028 for Model PA12NA024000ABAA\u003c\/h1\u003e\u003cp\u003eThis OEM pressure switch kit includes both the \u003cstrong\u003ehigh pressure switch (HK02ZA395)\u003c\/strong\u003e and \u003cstrong\u003elow pressure switch (HK02ZB028)\u003c\/strong\u003e factory-specified for the \u003cstrong\u003ePayne PA12NA024000ABAA\u003c\/strong\u003e split-system heat pump. Pressure switches are safety devices that monitor refrigerant pressure on both the high and low sides of the refrigerant circuit. When either switch detects an out-of-range pressure condition, it opens the control circuit and prevents the system from operating — protecting the compressor from damage due to loss of charge, refrigerant overcharge, or restricted airflow. Common symptoms of a failed pressure switch include the system locking out immediately at startup, the outdoor unit shutting down within seconds, or fault codes indicating a pressure trip on your thermostat or control board.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e High Side — HK02ZA395 | Low Side — HK02ZB028 | 24V control circuit compatible | Factory-calibrated trip and reset points matched to PA12NA024000ABAA refrigerant pressures | Spade terminal connectors\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e OEM pressure switches are factory-calibrated to the exact trip thresholds required by the PA12NA024000ABAA refrigerant circuit. Generic switches often carry wider pressure tolerances, which can allow unsafe operating conditions to go undetected or cause nuisance lockouts — both costly outcomes for compressor longevity.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall difficulty: 3\/5\u003c\/strong\u003e — Refrigerant system must be assessed by a certified HVAC technician before replacing pressure switches. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter for continuity testing, and manifold gauges to verify refrigerant pressures after reinstallation. Always disconnect power at the disconnect box before beginning any repair.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e 1-year OEM factory warranty on both HK02ZA395 and HK02ZB028. Orders ship same business day from our stocked warehouse.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eCompatibility:\u003c\/strong\u003e These pressure switches are the factory-matched replacements for the Payne \u003cstrong\u003ePA12NA024000ABAA\u003c\/strong\u003e split-system heat pump. Confirm OEM part numbers HK02ZA395 (high) and HK02ZB028 (low) against your unit's wiring diagram or data plate before ordering. Not sure which switch failed? Our fitment team can help you diagnose before you buy — contact us before placing your order.\u003c\/p\u003e","brand":"Payne","offers":[{"title":"OEM","offer_id":62909206626675,"sku":"PAYNE-PA12NA024000ABAA-PRESSURE_SWITCH-HK02ZA395","price":43.95,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62909206659443,"sku":"PAYNE-PA12NA024000ABAA-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_b3983822-ac32-4a5b-a9fa-ffc0ad7a5322.jpg?v=1780718539","url":"https:\/\/nationalhvacparts.com\/products\/payne-pa12na024000abaa-pressure-switch-jria74","provider":"National HVAC Parts","version":"1.0","type":"link"}