{"product_id":"payne-pa10ja01800gacaa-pressure-switch-jria74","title":"OEM Payne Pressure Switch HK02ZA395 \/ HK02ZB028 — PA10JA01800GACAA","description":"\u003ch1\u003eOEM Payne High \u0026amp; Low Pressure Switch for Model PA10JA01800GACAA\u003c\/h1\u003e\u003cp\u003eThis listing covers the OEM-matched pressure switch replacements — \u003cstrong\u003eHK02ZA395 (High Pressure Switch)\u003c\/strong\u003e and \u003cstrong\u003eHK02ZB028 (Low Pressure Switch)\u003c\/strong\u003e — factory-specified for the \u003cstrong\u003ePayne PA10JA01800GACAA\u003c\/strong\u003e packaged unit. Pressure switches are safety devices that monitor the inducer motor's draft by sensing negative air pressure (measured in inches of water column, or W.C.). If the inducer fails to establish proper draft, the pressure switch stays open and prevents the gas valve from energizing — protecting the heat exchanger and occupants from carbon monoxide risk. Common failure symptoms include a furnace that attempts ignition but locks out immediately, a blinking fault code indicating \"pressure switch open,\" or a unit that runs the inducer but never advances to the heating cycle.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e HK02ZA395 — High Pressure Switch | HK02ZB028 — Low Pressure Switch | Factory-calibrated W.C. rating | Normally open (NO) contacts | 1\/4\" Hose barb port | 24V control circuit compatible\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e OEM pressure switches are calibrated to exact factory W.C. thresholds. Generic substitutes often carry wider tolerances that can cause nuisance trips in cold weather or, worse, fail to open under genuine blocked-flue conditions — a serious safety risk.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall Difficulty: 3\/5\u003c\/strong\u003e — Requires basic comfort with control-circuit troubleshooting. Tools needed: multimeter (continuity\/DC voltage), 1\/4\" nut driver, needle-nose pliers, manometer (optional but recommended for confirming W.C. at switch port). Always confirm the inducer and vent path are clear before condemning the switch.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e 1-year OEM factory warranty against defects in materials and workmanship. Orders placed before 3 PM EST ship same business day from our climate-controlled warehouse.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eCompatibility:\u003c\/strong\u003e Both switches are factory-specified for the \u003cstrong\u003ePayne PA10JA01800GACAA\u003c\/strong\u003e packaged gas\/electric unit. Verify existing switch W.C. rating and hose port orientation against your unit's wiring diagram before installation. If you are unsure whether you need the high or low pressure switch, our parts team can confirm fitment from your fault code and model number — reach us via chat or phone before ordering.\u003c\/p\u003e","brand":"Payne","offers":[{"title":"OEM","offer_id":62909248438643,"sku":"PAYNE-PA10JA01800GACAA-PRESSURE_SWITCH-HK02ZA395","price":43.95,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62909248471411,"sku":"PAYNE-PA10JA01800GACAA-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_8a5dda34-7136-407a-9f60-201d80d80e2f.jpg?v=1780718525","url":"https:\/\/nationalhvacparts.com\/products\/payne-pa10ja01800gacaa-pressure-switch-jria74","provider":"National HVAC Parts","version":"1.0","type":"link"}