{"product_id":"payne-pa1pna042000aaba-pressure-switch-jria74","title":"OEM Payne High Pressure Switch HK02ZA395 for PA1PNA042000AABA","description":"\u003ch1\u003eOEM Payne High Pressure Switch HK02ZA395 for Model PA1PNA042000AABA\u003c\/h1\u003e\u003cp\u003eThis is the factory OEM high pressure switch (part number \u003cstrong\u003eHK02ZA395\u003c\/strong\u003e) designed specifically for the \u003cstrong\u003ePayne PA1PNA042000AABA\u003c\/strong\u003e packaged unit. The pressure switch is a critical safety device that monitors negative pressure created by the inducer draft motor, confirming that proper venting and airflow are established before allowing the control board to proceed with ignition. When this switch fails or becomes stuck in the open position, the system will lock out prior to ignition — resulting in a no-heat condition with the inducer running continuously but the burners never firing.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e High pressure switch | OEM part number HK02ZA395 | Factory-rated W.C. (water column) setpoint | Single-port sensing hose connection | 1\/4\" spade terminals\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e This OEM switch is calibrated to the exact W.C. rating specified by Payne engineering. Aftermarket pressure switches frequently ship with incorrect trip points, causing nuisance lockouts or — more dangerously — failing to detect true venting failures. OEM is strongly recommended for this safety-critical component.\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, flathead screwdriver, and a digital manometer to verify setpoint after installation. Inspect the sensing hose and port for cracks or blockages before installing the new switch.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e 1-year OEM factory warranty against defects. Orders placed before cutoff ship same business day from our stocked warehouse.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eCompatibility:\u003c\/strong\u003e Engineered for the Payne \u003cstrong\u003ePA1PNA042000AABA\u003c\/strong\u003e packaged unit. Always verify the W.C. rating stamped on your existing switch before ordering to confirm an exact match. If you are unsure of fitment, our HVAC parts specialists are available to verify compatibility before you purchase. \u003cstrong\u003eIn stock — order now and receive fast, same-day shipping.\u003c\/strong\u003e\u003c\/p\u003e","brand":"Payne","offers":[{"title":"OEM","offer_id":62908978397555,"sku":"PAYNE-PA1PNA042000AABA-PRESSURE_SWITCH-HK02ZA395","price":43.95,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62908978430323,"sku":"PAYNE-PA1PNA042000AABA-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_43230803-8246-4bf2-a947-dcb31268ca6e.jpg?v=1780718341","url":"https:\/\/nationalhvacparts.com\/products\/payne-pa1pna042000aaba-pressure-switch-jria74","provider":"National HVAC Parts","version":"1.0","type":"link"}