{"product_id":"payne-pa10ja018000abaa-pressure-switch-jria74","title":"OEM Payne Pressure Switch High\/Low for PA10JA018000ABAA","description":"\u003ch1\u003eOEM Payne High \u0026amp; Low Pressure Switch for Model PA10JA018000ABAA\u003c\/h1\u003e\u003cp\u003eThese OEM pressure switches — \u003cstrong\u003eHK02ZA395 (High Pressure Switch)\u003c\/strong\u003e and \u003cstrong\u003eHK02ZB028 (Low Pressure Switch)\u003c\/strong\u003e — are the factory-specified replacements for the \u003cstrong\u003ePayne PA10JA018000ABAA\u003c\/strong\u003e packaged air conditioning unit. Pressure switches monitor the inducer motor's airflow by sensing changes in water column (W.C.) pressure within the flue and combustion air pathways. When either switch fails or sticks open, the control board cannot verify safe draft conditions and will lock out the system before ignition begins — resulting in a no-heat call with no visible flame attempt.\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. setpoints | 1\/4\" Molex harness connectors | Direct OEM fitment for Payne PA10JA018000ABAA\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e OEM pressure switches are calibrated to the exact water column rating required by the PA10JA018000ABAA's inducer assembly. Generic substitutes with mismatched W.C. ratings can cause nuisance lockouts or, more dangerously, fail to detect a true blocked flue condition — a critical safety risk.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall difficulty: 3\/5\u003c\/strong\u003e — Shut off gas and power before servicing. Tools needed: 1\/4\" nut driver, flathead screwdriver, digital manometer (recommended for verification), and needle-nose pliers. Inspect inducer hose ports for blockage or cracks before installing the new switch. Photograph all tubing and wiring connections prior to removal.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e 1-year OEM factory warranty. Orders placed before cutoff ship the same business day from our warehouse.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eCompatibility:\u003c\/strong\u003e These switches are engineered specifically for the \u003cstrong\u003ePayne PA10JA018000ABAA\u003c\/strong\u003e packaged unit. If your unit is displaying a pressure switch fault code or locking out before any ignition attempt, verify the inducer motor spins freely and hose tubing is clear before condemning the switch. Our HVAC parts specialists are available to confirm fitment and part selection before you order — contact us today and get your system back online fast.\u003c\/p\u003e","brand":"Payne","offers":[{"title":"OEM","offer_id":62909249454451,"sku":"PAYNE-PA10JA018000ABAA-PRESSURE_SWITCH-HK02ZA395","price":43.95,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62909249487219,"sku":"PAYNE-PA10JA018000ABAA-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_d2d5b7fd-0c17-4db8-9f23-d4cf97df6b46.jpg?v=1780718430","url":"https:\/\/nationalhvacparts.com\/products\/payne-pa10ja018000abaa-pressure-switch-jria74","provider":"National HVAC Parts","version":"1.0","type":"link"}