{"product_id":"payne-pa10pa04800gadaa-pressure-switch-jria74","title":"OEM Payne Pressure Switch HK02ZA395 \/ HK02ZB028 for PA10PA04800GADAA","description":"\u003ch1\u003eOEM Payne High \u0026amp; Low Pressure Switch for Model PA10PA04800GADAA\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 PA10PA04800GADAA\u003c\/strong\u003e packaged gas\/electric unit. The pressure switch monitors the inducer motor's draft pressure through a rubber hose connected to the inducer housing. When the inducer creates adequate negative pressure, the switch closes and signals the control board to advance to the ignition sequence. A failed pressure switch interrupts this signal, causing a hard lockout — the system attempts to heat, the inducer spins, but ignition never begins. Common failure symptoms include a blinking fault code indicating an open pressure switch, the furnace recycling every 30–90 seconds without igniting, or the unit locking out entirely after three attempts.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e OEM part numbers HK02ZA395 (high) and HK02ZB028 (low) | Factory-calibrated W.C. (water column) rating matched to PA10PA04800GADAA inducer performance | SPST normally-open configuration | 1\/4\" Molex connector terminals\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e OEM pressure switches are calibrated to the exact W.C. rating required by this model's inducer. Generic substitutes with mismatched trip points can cause nuisance lockouts in cold weather or, worse, allow incomplete combustion draft — a genuine safety concern. Always choose OEM on pressure switches.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall difficulty: 2\/5\u003c\/strong\u003e — Power down the unit at the disconnect before servicing. Tools needed: 1\/4\" nut driver, flat-head screwdriver, and a manometer to verify draft if diagnosing (optional but recommended). Inspect the rubber pressure hose for cracks or blockages before replacing the switch — a clogged hose is a frequent misdiagnosis.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e 1-year OEM factory warranty. 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 \u003cstrong\u003ePayne PA10PA04800GADAA\u003c\/strong\u003e packaged unit. Verify your existing switch part number (HK02ZA395 or HK02ZB028) against your unit's data plate and control board fault code before ordering. Both switches are listed here — select the one matching your failed component. Need help confirming fitment? Our HVAC parts team verifies compatibility before you order. \u003cstrong\u003eIn stock — ships today.\u003c\/strong\u003e\u003c\/p\u003e","brand":"Payne","offers":[{"title":"OEM","offer_id":62909214753139,"sku":"PAYNE-PA10PA04800GADAA-PRESSURE_SWITCH-HK02ZA395","price":43.95,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62909214785907,"sku":"PAYNE-PA10PA04800GADAA-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_f17bb4c8-670b-485c-aaca-62a53df3fff4.jpg?v=1780718512","url":"https:\/\/nationalhvacparts.com\/products\/payne-pa10pa04800gadaa-pressure-switch-jria74","provider":"National HVAC Parts","version":"1.0","type":"link"}