{"product_id":"payne-pa10pa04800macaa-pressure-switch-jria74","title":"OEM Payne Pressure Switch HK02ZA395 \/ HK02ZB028 — PA10PA04800MACAA","description":"\u003ch1\u003eOEM Payne High \u0026amp; Low Pressure Switch HK02ZA395 \/ HK02ZB028 for Model PA10PA04800MACAA\u003c\/h1\u003e\u003cp\u003eThese OEM pressure switches are the factory-specified replacements for the \u003cstrong\u003ePayne PA10PA04800MACAA\u003c\/strong\u003e packaged gas\/electric unit. The pressure switch monitors inducer motor draft by sensing negative air pressure inside the flue system. When the inducer reaches proper speed and airflow, the switch closes to allow the ignition sequence to proceed. A failed pressure switch — whether the \u003cstrong\u003ehigh pressure switch (HK02ZA395)\u003c\/strong\u003e or \u003cstrong\u003elow pressure switch (HK02ZB028)\u003c\/strong\u003e — will interrupt the ignition cycle, triggering a lockout fault before the burners ever fire. Common symptoms include the inducer running but the furnace never reaching ignition, a blinking fault code indicating \"pressure switch stuck open,\" or a system that continuously recycles without heating.\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) rating | Designed for Payne PA10PA04800MACAA packaged unit inducer circuit\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e OEM pressure switches are calibrated to exact W.C. thresholds required by the \u003cstrong\u003ePA10PA04800MACAA\u003c\/strong\u003e control board. Generic substitutes often use wider pressure tolerances, risking nuisance lockouts or — more dangerously — failure to detect a true venting obstruction.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall difficulty: 2\/5\u003c\/strong\u003e — Shut off power and gas before servicing. Tools needed: 1\/4\" nut driver, needle-nose pliers, multimeter (continuity test), and short length of replacement tubing if hose is brittle. Always inspect the rubber sensing hose and port for cracks or condensation blockage before replacing the switch itself.\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 Both HK02ZA395 and HK02ZB028 are direct OEM replacements for the \u003cstrong\u003ePayne PA10PA04800MACAA\u003c\/strong\u003e 4-ton packaged unit. Verify your existing switch part number printed on the switch body before ordering to confirm high or low switch application. If you need both switches, contact our team — we can verify the complete kit for your unit before you buy. \u003cstrong\u003eIn stock and ships today.\u003c\/strong\u003e\u003c\/p\u003e","brand":"Payne","offers":[{"title":"OEM","offer_id":62909213639027,"sku":"PAYNE-PA10PA04800MACAA-PRESSURE_SWITCH-HK02ZA395","price":43.95,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62909213671795,"sku":"PAYNE-PA10PA04800MACAA-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_206c828b-196e-4b51-855d-73d23c26a434.jpg?v=1780718536","url":"https:\/\/nationalhvacparts.com\/products\/payne-pa10pa04800macaa-pressure-switch-jria74","provider":"National HVAC Parts","version":"1.0","type":"link"}