{"product_id":"carrier-pressure-switch-fiop300b521ga","title":"OEM Carrier Pressure Switch HK06WC121 for Model FIOP300B521GA","description":"\u003cdiv\u003e\n\u003ch1\u003eOEM Carrier Pressure Switch HK06WC121 for Model FIOP300B521GA\u003c\/h1\u003e\n\u003cp\u003eThis OEM Carrier air pressure switch safeguards your furnace by confirming proper draft inducer airflow before allowing ignition. A genuine factory replacement engineered for Carrier model FIOP300B521GA, it monitors negative vent pressure and signals the control board to proceed only when safe combustion venting is verified—preventing dangerous operation and frustrating lockouts. A stuck, cracked, or out-of-spec pressure switch is among the most common causes of no-heat and short-cycling service calls. Calibrated to the exact OEM trip and reset set points, this part restores safe, code-compliant furnace sequencing. Installation is moderate and usually takes a qualified technician 20–30 minutes: shut off power, transfer the rubber sensing tubing and spade terminal connections, and remount using the factory screws. We recommend professional installation and verifying the correct hose routing. Every order placed before 3PM CST ships same-day from our warehouse, helping you get the system back to reliable, worry-free heating quickly with a part built to match the original in fit and function.\u003c\/p\u003e\n\u003ch2\u003eCompatibility\u003c\/h2\u003e\n\u003cp\u003eThis part is compatible with Carrier model FIOP300B521GA.\u003c\/p\u003e\n\u003ch2\u003eShipping\u003c\/h2\u003e\n\u003cp\u003eSame-day shipping before 3 PM CST. 30-day returns on uninstalled parts.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"Carrier","offers":[{"title":"Default Title","offer_id":62942943707507,"sku":"carrier-pressure-switch-fiop300b521ga","price":52.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0984\/1190\/5395\/files\/nhvac-pressure-switch-fiop300b521ga.jpg?v=1781470838","url":"https:\/\/nationalhvacparts.com\/products\/carrier-pressure-switch-fiop300b521ga","provider":"National HVAC Parts","version":"1.0","type":"link"}