{"product_id":"payne-pa10ja04800gahaa-pressure-switch-jria74","title":"OEM Payne Pressure Switch HK02ZA395 \/ HK02ZB028 — PA10JA04800GAHAA","description":"\u003ch1\u003eOEM Payne High \u0026amp; Low Pressure Switch for Model PA10JA04800GAHAA\u003c\/h1\u003e\u003cp\u003eThis OEM pressure switch kit covers both the \u003cstrong\u003ehigh pressure switch (HK02ZA395)\u003c\/strong\u003e and \u003cstrong\u003elow pressure switch (HK02ZB028)\u003c\/strong\u003e for the \u003cstrong\u003ePayne PA10JA04800GAHAA\u003c\/strong\u003e packaged unit. The pressure switch proves that the inducer motor has established adequate draft before allowing the ignition sequence to proceed. A failed pressure switch causes the furnace or packaged unit to lock out during the pre-ignition stage — the inducer runs, but the system never advances to spark or gas valve opening. Symptoms include a blinking fault code, no heat, or the system cycling the inducer motor repeatedly without lighting.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e Includes high-stage switch (HK02ZA395) and low-stage switch (HK02ZB028) | Factory-calibrated water column (W.C.) rating | SPST normally-open contacts | OEM-matched diaphragm tolerance for accurate draft proving\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e OEM pressure switches are factory-calibrated to the exact W.C. rating required by the PA10JA04800GAHAA combustion system. Generic switches often carry wider tolerances, risking nuisance lockouts or — more dangerously — allowing ignition under inadequate draft conditions.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall Difficulty: 3\/5\u003c\/strong\u003e — Requires disconnecting the hose port from the inducer housing and swapping the small-gauge wiring connectors. Tools needed: flathead screwdriver, needle-nose pliers, manometer (recommended for verification). Always power down the unit at the disconnect and confirm zero voltage before starting. Check hose and port for blockage before condemning the switch.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e 1-year OEM factory warranty. Order by 3 PM local time and your part ships the same business day from our warehouse.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eCompatibility:\u003c\/strong\u003e Engineered specifically for the \u003cstrong\u003ePayne PA10JA04800GAHAA\u003c\/strong\u003e 4-ton packaged gas\/electric unit. Both OEM part numbers — HK02ZA395 and HK02ZB028 — are listed to ensure you receive the correct switch for your unit's stage configuration. Verify your existing switch's hose port orientation and W.C. rating on the data plate before ordering. Need help confirming fitment? Our HVAC parts specialists verify compatibility before your order is placed — no guesswork required.\u003c\/p\u003e","brand":"Payne","offers":[{"title":"OEM","offer_id":62909223633267,"sku":"PAYNE-PA10JA04800GAHAA-PRESSURE_SWITCH-HK02ZA395","price":43.95,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62909223666035,"sku":"PAYNE-PA10JA04800GAHAA-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_e5635b25-0b3a-4df9-8456-118f3db68eb3.jpg?v=1780718532","url":"https:\/\/nationalhvacparts.com\/products\/payne-pa10ja04800gahaa-pressure-switch-jria74","provider":"National HVAC Parts","version":"1.0","type":"link"}