{"product_id":"carrier-fiop300b511ga-pressure-switch-jri7yl","title":"OEM Carrier High Pressure Switch HK02ZA442 for FIOP300B511GA","description":"\u003ch1\u003eOEM Carrier High Pressure Switch HK02ZA442 for Model FIOP300B511GA\u003c\/h1\u003e\u003cp\u003eThis OEM high pressure switch (part number \u003cstrong\u003eHK02ZA442\u003c\/strong\u003e) is the factory-specified replacement for the \u003cstrong\u003eCarrier FIOP300B511GA\u003c\/strong\u003e system. The pressure switch monitors the negative pressure created by the inducer draft motor to confirm proper venting before allowing the ignition sequence to proceed. When it fails or sticks open, the control board will lock out the system — preventing ignition entirely and typically triggering a fault code related to pressure switch failure. Common symptoms include the inducer motor running continuously with no ignition, or the system cycling off before the burners ever light.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e High pressure switch | OEM part number HK02ZA442 | Factory-calibrated W.C. (water column) rating | Single-port design | Matches original factory switching threshold exactly\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e This is a genuine OEM Carrier pressure switch, calibrated to the precise water-column rating required by the \u003cstrong\u003eFIOP300B511GA\u003c\/strong\u003e. Aftermarket switches often carry wider switching tolerances, which can cause nuisance lockouts or — more dangerously — fail to detect a blocked flue, creating a potential safety hazard.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall Difficulty: 2\/5\u003c\/strong\u003e — Disconnect power before servicing. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers. Disconnect the rubber hose port and two-wire harness, swap the switch, and verify hose condition for cracks or blockages before reassembly. Check for fault codes to confirm repair.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e 1-year OEM factory warranty against defects. Orders placed before cutoff ship the same business day from our warehouse.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eCompatibility:\u003c\/strong\u003e Designed for the Carrier \u003cstrong\u003eFIOP300B511GA\u003c\/strong\u003e packaged or air handler unit. Always verify your existing switch's W.C. rating and port configuration against your unit's data plate and wiring diagram before ordering to ensure a correct fit. Our parts specialists are available to confirm compatibility before you buy — don't guess on a safety-critical component. \u003cstrong\u003eIn stock and ships today.\u003c\/strong\u003e\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62909503570291,"sku":"CARRIE-FIOP300B511GA-PRESSURE_SWITCH-HK02ZA442","price":27.0,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62909503603059,"sku":"CARRIE-FIOP300B511GA-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_7e11aedc-fb3d-4a0d-b909-6beca9244927.jpg?v=1782924888","url":"https:\/\/nationalhvacparts.com\/products\/carrier-fiop300b511ga-pressure-switch-jri7yl","provider":"National HVAC Parts","version":"1.0","type":"link"}