{"product_id":"carrier-fiop300511ga-pressure-switch-jri7yl","title":"OEM Carrier High Pressure Switch HK02ZA442 for FIOP300511GA","description":"\u003ch1\u003eOEM Carrier High Pressure Switch HK02ZA442 for Model FIOP300511GA\u003c\/h1\u003e\u003cp\u003eThis is the factory OEM high pressure switch (part number \u003cstrong\u003eHK02ZA442\u003c\/strong\u003e) for the \u003cstrong\u003eCarrier FIOP300511GA\u003c\/strong\u003e unit. The pressure switch monitors the inducer motor's ability to create the correct negative pressure (draft) inside the heat exchanger before allowing the ignition sequence to proceed. If the switch fails to close — or fails to open when it should — the control board will lock out the system, preventing heating. Common symptoms include the inducer running but the system never advancing to ignition, a flashing fault code indicating a pressure switch fault, or intermittent no-heat calls that reset after a power cycle.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e High pressure switch configuration | OEM water column (W.C.) rating factory-matched to \u003cstrong\u003eCarrier FIOP300511GA\u003c\/strong\u003e | Single-port design | Spade terminal connections | Replaces OEM part number \u003cstrong\u003eHK02ZA442\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e This is a genuine OEM Carrier component manufactured to exact W.C. trip-point specifications. Aftermarket pressure switches often carry wider tolerances, which can cause nuisance lockouts or — more dangerously — fail to detect a true blocked flue condition, creating a safety hazard.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall Difficulty: 2\/5\u003c\/strong\u003e — Power down the unit at the disconnect and breaker before servicing. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, and a manometer to verify W.C. rating if troubleshooting further. Inspect the rubber hose port for cracks or blockage before replacing the switch, as a clogged hose is a common root cause of pressure switch faults.\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 Designed as the direct OEM replacement for \u003cstrong\u003eCarrier FIOP300511GA\u003c\/strong\u003e. Always confirm the OEM part number \u003cstrong\u003eHK02ZA442\u003c\/strong\u003e against the label on your existing switch and verify the unit's data plate before ordering. Our parts specialists are available to confirm fitment — just reach out before you order. In stock and ready to ship today.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62909504127347,"sku":"CARRIE-FIOP300511GA-PRESSURE_SWITCH-HK02ZA442","price":27.0,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62909504160115,"sku":"CARRIE-FIOP300511GA-PRESSURE_SWITCH-HK02ZA442-GEN","price":19.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0984\/1190\/5395\/files\/nhvac-draft-inducer-HK02ZA442_d7d3f93d-db17-4937-84cc-e62425099dc2.jpg?v=1782924883","url":"https:\/\/nationalhvacparts.com\/products\/carrier-fiop300511ga-pressure-switch-jri7yl","provider":"National HVAC Parts","version":"1.0","type":"link"}