{"product_id":"payne-pa11ja030000aaaa-pressure-switch-jria74","title":"OEM Payne Pressure Switch Kit for PA11JA030000AAAA — HK02ZA395 \/ HK02Z","description":"\u003ch1\u003eOEM Payne High \u0026amp; Low Pressure Switch Kit for Model PA11JA030000AAAA\u003c\/h1\u003e\u003cp\u003eThis factory OEM pressure switch kit includes both the \u003cstrong\u003ehigh pressure switch (HK02ZA395)\u003c\/strong\u003e and \u003cstrong\u003elow pressure switch (HK02ZB028)\u003c\/strong\u003e for the Payne \u003cstrong\u003ePA11JA030000AAAA\u003c\/strong\u003e gas furnace. Pressure switches prove that the inducer draft motor is producing the correct negative pressure (measured in inches of water column) before allowing the control board to advance to ignition. When either switch fails — or when the tubing, ports, or inducer become obstructed — the furnace locks out before the igniter ever fires. Common symptoms include a blinking fault code indicating a pressure switch fault, the inducer running but ignition never starting, or intermittent no-heat calls on cold days when pressure differentials are hardest to maintain.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e Includes HK02ZA395 (High Pressure Switch) and HK02ZB028 (Low Pressure Switch) | Factory-rated W.C. (inches water column) set points matched to PA11JA030000AAAA inducer specifications | SPST normally-open configuration | 1\/4\" Molex electrical connector\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e OEM Payne\/Carrier-family pressure switches are calibrated to exact W.C. thresholds. Aftermarket switches frequently carry ±15% trip-point tolerances, causing nuisance lockouts in cold weather or false passes that allow unsafe operation.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall difficulty: 3\/5\u003c\/strong\u003e — Power down and lock out the unit before servicing. Tools needed: 1\/4\" nut driver, flathead screwdriver, manometer (recommended to verify inducer pressure post-install), and zip ties to re-secure tubing. Inspect rubber pressure tubing for cracks or blockages before installing new switches — a collapsed hose is a common root cause of switch failure.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e 1-year OEM factory warranty. Orders placed before 3 PM EST ship same business day from our warehouse.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eCompatibility:\u003c\/strong\u003e Engineered exclusively for the Payne \u003cstrong\u003ePA11JA030000AAAA\u003c\/strong\u003e gas furnace. Both OEM part numbers HK02ZA395 and HK02ZB028 are included in this listing — select the individual switch you need or order both as a diagnostic kit. Always verify part numbers against your unit's wiring diagram or data plate before ordering. Our fitment team is available to confirm compatibility before you purchase.\u003c\/p\u003e","brand":"Payne","offers":[{"title":"OEM","offer_id":62909210394995,"sku":"PAYNE-PA11JA030000AAAA-PRESSURE_SWITCH-HK02ZA395","price":43.95,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62909210427763,"sku":"PAYNE-PA11JA030000AAAA-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_2592df94-871d-4a48-ab11-a57ef6f93b70.jpg?v=1780718608","url":"https:\/\/nationalhvacparts.com\/products\/payne-pa11ja030000aaaa-pressure-switch-jria74","provider":"National HVAC Parts","version":"1.0","type":"link"}