{"product_id":"payne-pa12na03000gahaa-pressure-switch-jria74","title":"OEM Payne Pressure Switch Kit for PA12NA03000GAHAA — HK02ZA395 \/ HK02Z","description":"\u003ch1\u003eOEM Payne High \u0026amp; Low Pressure Switch Kit for Model PA12NA03000GAHAA\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 PA12NA03000GAHAA\u003c\/strong\u003e packaged unit. Pressure switches are safety devices that prove the inducer motor is creating adequate draft before allowing ignition to proceed. A failed pressure switch typically causes the system to lock out before any ignition attempt — the inducer runs, but the furnace or heat pump never advances to the next stage. You may also see a diagnostic fault code indicating an open pressure switch circuit.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e Includes HK02ZA395 (High Pressure Switch) and HK02ZB028 (Low Pressure Switch) | Factory-calibrated water column (W.C.) rating | OEM-matched single-port or dual-port hose fitting | Direct plug-in connector — no splicing required\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e OEM pressure switches are factory-calibrated to exact W.C. trip points for this unit. Off-brand alternatives frequently use wider tolerances, risking nuisance lockouts or — more dangerously — failure to detect a true blocked flue condition.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall difficulty: 2\/5\u003c\/strong\u003e — Disconnect power before servicing. Tools needed: 1\/4\" nut driver, needle-nose pliers, multimeter (to verify switch continuity), and a manometer for post-install verification. Inspect rubber hose tubing for cracks or blockages before installing new switch.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e 1-year OEM factory warranty on both switches. Orders placed before cut-off ship same business day from our climate-controlled warehouse.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eCompatibility:\u003c\/strong\u003e Engineered specifically for the \u003cstrong\u003ePayne PA12NA03000GAHAA\u003c\/strong\u003e packaged unit. Always verify your existing switch W.C. rating against the data plate and wiring diagram in your unit's access panel before ordering. Need help confirming fitment? Our HVAC parts specialists verify compatibility before your order ships — no guesswork required.\u003c\/p\u003e","brand":"Payne","offers":[{"title":"OEM","offer_id":62909197779315,"sku":"PAYNE-PA12NA03000GAHAA-PRESSURE_SWITCH-HK02ZA395","price":43.95,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62909197812083,"sku":"PAYNE-PA12NA03000GAHAA-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_9726d876-89e9-48ee-a4fd-cd3ce03a13e2.jpg?v=1780718612","url":"https:\/\/nationalhvacparts.com\/products\/payne-pa12na03000gahaa-pressure-switch-jria74","provider":"National HVAC Parts","version":"1.0","type":"link"}