{"product_id":"payne-pa4rng018000baaa-pressure-switch-jria74","title":"OEM Payne Pressure Switch Kit for PA4RNG018000BAAA — HK02ZA395 \u0026 HK02Z","description":"\u003ch1\u003eOEM Payne High \u0026amp; Low Pressure Switch Kit for Model PA4RNG018000BAAA\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 PA4RNG018000BAAA\u003c\/strong\u003e packaged unit. Pressure switches are safety devices that prove the inducer motor is generating adequate draft before allowing the ignition sequence to begin. When either switch fails — or when tubing becomes cracked, clogged, or waterlogged — the control board never receives the signal to proceed, and the system locks out on a pressure switch fault code before a single ignition attempt is made. Common symptoms include a blinking fault code indicating \"pressure switch open,\" an inducer motor that runs continuously with no ignition, or a furnace that short-cycles in cold weather.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e High pressure switch OEM Part HK02ZA395 | Low pressure switch OEM Part HK02ZB028 | Factory-calibrated W.C. (water column) trip point | Direct OEM replacement — no wiring modification required\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e OEM switches are precision-calibrated to the exact W.C. rating required by the Payne PA4RNG018000BAAA control board. Off-brand switches with mismatched trip points can cause nuisance lockouts in cold weather or, worse, fail to detect a true blocked flue condition — 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 beginning. Tools needed: 1\/4\" nut driver, flat-head screwdriver, manometer (recommended to verify W.C. post-install), and zip ties for tubing routing. Inspect all rubber pressure tubing for cracks and replace if brittle. Photograph all tubing connections before disconnecting.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e 1-year OEM factory warranty. Orders placed before cutoff ship same business day from our warehouse.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eCompatibility:\u003c\/strong\u003e This kit is engineered specifically for the \u003cstrong\u003ePayne PA4RNG018000BAAA\u003c\/strong\u003e packaged gas unit. Always cross-reference both OEM part numbers (HK02ZA395 and HK02ZB028) against your unit's wiring diagram and service label before installing. If you're unsure which switch has failed, a manometer test at the port will confirm whether the switch is opening at the correct draft pressure. Our HVAC parts specialists are available to verify fitment before you order — \u003cstrong\u003ein stock and ships today.\u003c\/strong\u003e\u003c\/p\u003e","brand":"Payne","offers":[{"title":"OEM","offer_id":62908859974003,"sku":"PAYNE-PA4RNG018000BAAA-PRESSURE_SWITCH-HK02ZA395","price":43.95,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62908860006771,"sku":"PAYNE-PA4RNG018000BAAA-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_6a992070-9074-44e3-9125-4ca7ca057301.jpg?v=1780718633","url":"https:\/\/nationalhvacparts.com\/products\/payne-pa4rng018000baaa-pressure-switch-jria74","provider":"National HVAC Parts","version":"1.0","type":"link"}