{"product_id":"payne-pa10ja04800gadaa-pressure-switch-jria74","title":"OEM Payne Pressure Switch Set HK02ZA395 \/ HK02ZB028 — PA10JA04800GADAA","description":"\u003ch1\u003eOEM Payne High \u0026amp; Low Pressure Switch Set for Model PA10JA04800GADAA\u003c\/h1\u003e\u003cp\u003eThis OEM-matched pressure switch set includes both the \u003cstrong\u003ehigh pressure switch (HK02ZA395)\u003c\/strong\u003e and \u003cstrong\u003elow pressure switch (HK02ZB028)\u003c\/strong\u003e designed as factory replacements for the \u003cstrong\u003ePayne PA10JA04800GADAA\u003c\/strong\u003e packaged unit. Pressure switches monitor the inducer motor's draft by sensing negative water-column (W.C.) pressure inside the heat exchanger. When either switch fails — or when venting is partially obstructed — the control board never receives the \"proof of draft\" signal and the system locks out before ignition, leaving you with no heat and often a blinking fault code.\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. trip points | 24V control circuit compatible | OEM-matched port diameter and mounting bracket\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e These OEM switches are factory-calibrated to the exact W.C. rating required by the PA10JA04800GADAA. Aftermarket pressure switches often carry wide trip-point tolerances that can cause nuisance lockouts or, worse, fail to detect a genuine blocked-flue condition — a serious safety concern.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall difficulty: 3\/5\u003c\/strong\u003e — Power down and lock out the unit before servicing. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, a manometer or magnehelic gauge to verify W.C. reading post-install, and zip ties for hose routing. Always inspect the rubber hose and port nipple for cracks or blockages before condemning the switch.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e 1-year OEM factory warranty. Both switches ship together same business day from our climate-controlled warehouse.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eCompatibility:\u003c\/strong\u003e This listing covers the matched high\/low pressure switch pair for Payne model \u003cstrong\u003ePA10JA04800GADAA\u003c\/strong\u003e. Confirm your existing switch part numbers (printed on the switch body label) match HK02ZA395 and HK02ZB028 before ordering. If only one switch has failed, each can also be sourced individually — contact our fitment team for assistance. Order today and your parts ship the same business day.\u003c\/p\u003e","brand":"Payne","offers":[{"title":"OEM","offer_id":62909224386931,"sku":"PAYNE-PA10JA04800GADAA-PRESSURE_SWITCH-HK02ZA395","price":43.95,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62909224419699,"sku":"PAYNE-PA10JA04800GADAA-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_8931630b-c653-4645-8f08-07fc90aae8dc.jpg?v=1780718649","url":"https:\/\/nationalhvacparts.com\/products\/payne-pa10ja04800gadaa-pressure-switch-jria74","provider":"National HVAC Parts","version":"1.0","type":"link"}