{"product_id":"payne-pa10ja048000acaa-pressure-switch-jria74","title":"OEM Payne Pressure Switch Kit for PA10JA048000ACAA (HK02ZA395 \/ HK02ZB","description":"\u003ch1\u003eOEM Payne High \u0026amp; Low Pressure Switch Kit for Model PA10JA048000ACAA\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 PA10JA048000ACAA\u003c\/strong\u003e packaged unit. Pressure switches are safety devices that monitor the inducer motor's negative air pressure to confirm proper venting before allowing ignition. When either switch fails — or when a blocked flue, cracked port hose, or weak inducer prevents adequate pressure — the control board receives no proof signal, halting the heating sequence entirely. Typical symptoms include a furnace that attempts to start but locks out before ignition, error codes indicating a pressure switch fault, or an inducer that runs continuously without progressing to the heating stage.\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-calibrated W.C. (water column) ratings | SPST normally open contacts | OEM-matched port diameter and hose barb sizing for drop-in fitment\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e OEM pressure switches are calibrated to exact water-column trip points for the PA10JA048000ACAA inducer assembly. Generic alternatives frequently carry wider tolerance ratings that cause nuisance lockouts in cold weather or fail to trip under genuinely unsafe flue conditions — a safety risk you should not accept.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall difficulty: 3\/5\u003c\/strong\u003e — Requires disconnecting 24V control wiring and port hose(s). Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter (continuity check), and a manometer or magnehelic gauge if diagnosing versus replacing. Always confirm the inducer and port hose are clear before condemning the switch.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e 1-year OEM factory warranty. In-stock and ships same business day from our warehouse — order by 3 PM local time for same-day dispatch.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eCompatibility:\u003c\/strong\u003e This kit is factory-matched to the \u003cstrong\u003ePayne PA10JA048000ACAA\u003c\/strong\u003e 4-ton packaged gas\/electric unit. Confirm both OEM part numbers (HK02ZA395 and HK02ZB028) against your unit's data plate and wiring diagram before ordering. If you need only one switch, contact our parts team and we'll verify individual fitment at no charge. Questions about fit? We confirm compatibility before you buy.\u003c\/p\u003e","brand":"Payne","offers":[{"title":"OEM","offer_id":62909225730419,"sku":"PAYNE-PA10JA048000ACAA-PRESSURE_SWITCH-HK02ZA395","price":43.95,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62909225763187,"sku":"PAYNE-PA10JA048000ACAA-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_a51dcec4-0cea-462d-82f2-401a41a1814e.jpg?v=1780718603","url":"https:\/\/nationalhvacparts.com\/products\/payne-pa10ja048000acaa-pressure-switch-jria74","provider":"National HVAC Parts","version":"1.0","type":"link"}