{"product_id":"payne-pa13pr036000acaa-pressure-switch-jria74","title":"OEM Payne Pressure Switch HK02ZA395 \/ HK02ZB028 for PA13PR036000ACAA","description":"\u003ch1\u003eOEM Payne High \u0026amp; Low Pressure Switch HK02ZA395 \/ HK02ZB028 for Model PA13PR036000ACAA\u003c\/h1\u003e\u003cp\u003eThis OEM pressure switch is the factory-specified replacement for the \u003cstrong\u003ePayne PA13PR036000ACAA\u003c\/strong\u003e split-system heat pump. The pressure switch monitors the inducer blower's negative pressure (measured in inches of water column) to confirm safe venting conditions before allowing the gas valve to open. When either the high-pressure switch (\u003cstrong\u003eHK02ZA395\u003c\/strong\u003e) or low-pressure switch (\u003cstrong\u003eHK02ZB028\u003c\/strong\u003e) fails, the control board detects an open circuit and locks out the heating cycle — leaving you with a system that appears to start but never reaches ignition. Common symptoms include a continuously running inducer with no heat, a blinking fault code indicating a stuck-open or stuck-closed pressure switch, and repeated short-cycling before lockout.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e OEM part numbers HK02ZA395 (High Pressure Switch) and HK02ZB028 (Low Pressure Switch) | Factory-matched W.C. (inches water column) rating | 1\/4\" Spade terminals | Single-port diaphragm-style switch designed for Payne PA13PR036000ACAA heat pump systems\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e OEM pressure switches are calibrated to the exact W.C. trip point specified by Payne engineering. Generic alternatives frequently use broader tolerance thresholds, causing nuisance lockouts or — more dangerously — allowing operation under improper venting conditions that can lead to heat exchanger stress or carbon monoxide risk.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall Difficulty: 2\/5\u003c\/strong\u003e — Disconnect power before servicing. Tools needed: 1\/4\" nut driver, flathead screwdriver, U-tube manometer (recommended for verification). Photograph all hose and wire connections before removal. Inspect the rubber hose port for cracks or blockages, which are a common root cause of switch failure.\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 warehouse when placed before 3 PM local time.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eCompatibility:\u003c\/strong\u003e Engineered specifically for the Payne \u003cstrong\u003ePA13PR036000ACAA\u003c\/strong\u003e split-system heat pump (3-ton, single-stage). Verify the failed switch against your unit's wiring diagram and confirm whether you need the high-pressure (HK02ZA395) or low-pressure (HK02ZB028) switch — or both — before ordering. Our HVAC parts specialists are available to confirm fitment at no charge. \u003cstrong\u003eIn stock and ships today.\u003c\/strong\u003e\u003c\/p\u003e","brand":"Payne","offers":[{"title":"OEM","offer_id":62909077651827,"sku":"PAYNE-PA13PR036000ACAA-PRESSURE_SWITCH-HK02ZA395","price":43.95,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62909077684595,"sku":"PAYNE-PA13PR036000ACAA-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_9fd93a5f-5793-4b3d-8e76-060e65df48e4.jpg?v=1780718517","url":"https:\/\/nationalhvacparts.com\/products\/payne-pa13pr036000acaa-pressure-switch-jria74","provider":"National HVAC Parts","version":"1.0","type":"link"}