{"product_id":"payne-pa12na02400gaaaa-pressure-switch-jria74","title":"OEM Payne Pressure Switch HK02ZA395 \/ HK02ZB028 — PA12NA02400GAAAA","description":"\u003ch1\u003eOEM Payne High \u0026amp; Low Pressure Switch HK02ZA395 \/ HK02ZB028 for Model PA12NA02400GAAAA\u003c\/h1\u003e\u003cp\u003eThese OEM pressure switches are the factory-specified replacements for the \u003cstrong\u003ePayne PA12NA02400GAAAA\u003c\/strong\u003e packaged gas\/electric unit. The pressure switch proves that the inducer motor is creating sufficient draft before allowing the control board to proceed with ignition. A failed pressure switch causes the system to lock out prior to ignition — the inducer will run but the burners will never light, resulting in a no-heat fault code. Two switches are used in this application: \u003cstrong\u003eHK02ZA395 (High Pressure Switch)\u003c\/strong\u003e monitors the upper W.C. threshold, while \u003cstrong\u003eHK02ZB028 (Low Pressure Switch)\u003c\/strong\u003e monitors the lower W.C. threshold. Both must be functioning correctly to complete the ignition sequence.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e HK02ZA395 — High Pressure Switch, factory W.C. rating | HK02ZB028 — Low Pressure Switch, factory W.C. rating | SPST normally-open configuration | 1\/4\" Santoprene hose port | 24V control circuit compatible\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e OEM pressure switches are factory-calibrated to exact water column ratings for this unit. Generic alternatives often carry loose W.C. tolerances that can cause nuisance lockouts or, more dangerously, fail to detect true venting failures — a serious safety risk.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall difficulty: 3\/5\u003c\/strong\u003e — Shut off power and gas before servicing. Tools needed: 1\/4\" nut driver, needle-nose pliers, manometer (recommended for post-install verification), and a phone or camera to photograph hose routing before disconnecting. Inspect hose tubing for cracks or blockages before replacing the switch.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e 1-year OEM factory warranty. Ships same business day from our warehouse stock.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eCompatibility:\u003c\/strong\u003e Engineered specifically for the \u003cstrong\u003ePayne PA12NA02400GAAAA\u003c\/strong\u003e packaged unit. Always verify your existing switch part numbers (printed on the switch body label) match HK02ZA395 or HK02ZB028 before ordering. If you are unsure which switch has failed, our fitment team can help you diagnose before you buy. Order today and your part ships the same business day.\u003c\/p\u003e","brand":"Payne","offers":[{"title":"OEM","offer_id":62909205217651,"sku":"PAYNE-PA12NA02400GAAAA-PRESSURE_SWITCH-HK02ZA395","price":43.95,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62909205250419,"sku":"PAYNE-PA12NA02400GAAAA-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_8d131366-3830-4c58-9ed3-bf8d77c1239f.jpg?v=1780718541","url":"https:\/\/nationalhvacparts.com\/products\/payne-pa12na02400gaaaa-pressure-switch-jria74","provider":"National HVAC Parts","version":"1.0","type":"link"}