{"product_id":"carrier-ph12na04800gadaa-pressure-switch-jrhhvr","title":"OEM Carrier Pressure Switch 22#CLS 7#OPN 50\" Leads — PH12NA04800GADAA","description":"\u003ch1\u003eOEM Carrier Pressure Switch HK02ZB038 for Model PH12NA04800GADAA\u003c\/h1\u003e\u003cp\u003eThis OEM pressure switch is the factory-specified replacement part \u003cstrong\u003eHK02ZB038\u003c\/strong\u003e for the \u003cstrong\u003eCarrier PH12NA04800GADAA\u003c\/strong\u003e packaged heat pump unit. The pressure switch monitors the inducer motor's negative pressure to confirm the flue gas pathway is open and safe before allowing the ignition sequence to proceed. When it fails — or becomes stuck open — the control board never receives proof of airflow, causing the system to lock out before a flame is ever established. Common symptoms include no heat, rapid cycling, or a fault code indicating a pressure switch failure on the thermostat or control board display.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e 22 PSI close | 7 PSI open | 50\" wire leads | Single-port negative pressure sensing | Factory OEM part number HK02ZB038\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e This is a genuine Carrier OEM component manufactured to exact setpoint tolerances. Generic aftermarket switches frequently drift out of calibration, causing nuisance lockouts or — worse — unsafe ignition attempts with a restricted flue.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall difficulty: 2\/5\u003c\/strong\u003e — Turn off power to the unit at the disconnect before beginning. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, and a digital manometer (recommended to verify setpoints after installation). Photograph the existing wiring and tubing connections before disconnecting.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e 1-year OEM manufacturer warranty against defects. In-stock and ships same business day from our warehouse.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eCompatibility:\u003c\/strong\u003e Engineered for the Carrier \u003cstrong\u003ePH12NA04800GADAA\u003c\/strong\u003e packaged heat pump unit. Always cross-reference your unit's data plate and existing part number before ordering to confirm fitment. Have questions? Our HVAC parts specialists verify compatibility before you buy — order with confidence.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62641944789363,"sku":"CARRIE-PH12NA04800GADAA-PRESSURE_SWITCH-HK02ZB038","price":57.95,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62641944822131,"sku":"CARRIE-PH12NA04800GADAA-PRESSURE_SWITCH-HK02ZB038-GEN","price":50.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0984\/1190\/5395\/files\/nhvac-pressure-switch-HK02ZB038_f1e0abb6-33bb-4d5f-9858-9e7c37b2dc2b.jpg?v=1775036962","url":"https:\/\/nationalhvacparts.com\/products\/carrier-ph12na04800gadaa-pressure-switch-jrhhvr","provider":"National HVAC Parts","version":"1.0","type":"link"}