{"product_id":"payne-pa10ja018000agaa-pressure-switch-jria74","title":"OEM Payne Pressure Switch HK02ZA395 \/ HK02ZB028 — PA10JA018000AGAA","description":"\u003ch1\u003eOEM Payne High \u0026amp; Low Pressure Switch HK02ZA395 \/ HK02ZB028 for Model PA10JA018000AGAA\u003c\/h1\u003e\u003cp\u003eThese OEM pressure switches are the factory-specified replacements for the \u003cstrong\u003ePayne PA10JA018000AGAA\u003c\/strong\u003e packaged unit. The pressure switch monitors the inducer motor's draft by measuring air pressure changes in the flue and combustion air pathways. When the inducer is running correctly, the switch closes to allow the control board to proceed with ignition. A failed pressure switch — whether stuck open or failing to sense proper pressure — will put the system into a hard lockout before a single ignition attempt, leaving you with no heat. Common symptoms include an inducer motor that runs continuously with no ignition, fault codes for pressure switch failure, or a unit that cycles the inducer but never advances to the trial-for-ignition stage.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e OEM Part Numbers: \u003cstrong\u003eHK02ZA395\u003c\/strong\u003e (High Pressure Switch) and \u003cstrong\u003eHK02ZB028\u003c\/strong\u003e (Low Pressure Switch) | Factory water-column (W.C.) rating matched to PA10JA018000AGAA specifications | SPST normally open contacts | Original equipment manufacturer quality\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e OEM pressure switches carry the exact W.C. rating calibrated at the factory for this unit. Generic substitutes often carry broader tolerance ranges, causing nuisance lockouts or — worse — failing to detect a true venting problem, creating a safety risk.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall difficulty: 3\/5\u003c\/strong\u003e — Shut off power and gas before beginning. Tools needed: 1\/4\" nut driver, flathead screwdriver, needle-nose pliers, and a manometer or magnehelic gauge to verify switch trip point after installation. Always inspect the pressure switch hose for cracks, blockages, or condensate before condemning the switch itself.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e 1-year OEM factory warranty against defects. 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 Engineered specifically for the \u003cstrong\u003ePayne PA10JA018000AGAA\u003c\/strong\u003e packaged gas\/electric unit. Always confirm W.C. rating and hose port configuration against your unit's data plate and existing switch markings before installing. If you're unsure which switch — high or low — has failed, our team can help verify fitment and diagnosis before you order. \u003cstrong\u003eOrder now and get same-day shipping on in-stock OEM Payne parts.\u003c\/strong\u003e\u003c\/p\u003e","brand":"Payne","offers":[{"title":"OEM","offer_id":62909248635251,"sku":"PAYNE-PA10JA018000AGAA-PRESSURE_SWITCH-HK02ZA395","price":43.95,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62909248668019,"sku":"PAYNE-PA10JA018000AGAA-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_d3aa077e-6d53-410f-aa08-0cd8ee417435.jpg?v=1780718524","url":"https:\/\/nationalhvacparts.com\/products\/payne-pa10ja018000agaa-pressure-switch-jria74","provider":"National HVAC Parts","version":"1.0","type":"link"}