{"product_id":"carrier-fiop300501ga-pressure-switch-jri7yl","title":"OEM Carrier High Pressure Switch HK02ZA442 for FIOP300501GA","description":"\u003ch1\u003eOEM Carrier High Pressure Switch HK02ZA442 for Model FIOP300501GA\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 FIOP300501GA\u003c\/strong\u003e unit. The pressure switch is a critical safety component in the combustion air proving circuit — it monitors the negative pressure (draft) created by the inducer motor to verify safe venting conditions before allowing the control board to initiate ignition. When this switch fails or sticks open, the furnace will typically lock out before reaching the ignition stage, leaving you with a no-heat condition and often a diagnostic fault code related to pressure switch failure.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e High pressure switch | OEM part number HK02ZA442 | 24V control circuit compatible | Factory-calibrated W.C. (water column) setpoint matched to FIOP300501GA inducer specifications — always verify rating on existing switch before ordering\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e This is a genuine Carrier OEM pressure switch manufactured to exact factory setpoint tolerances. Aftermarket switches frequently carry wider W.C. tolerances that can cause nuisance lockouts or, worse, fail to detect a true venting fault — making OEM the only safe choice for this safety-critical component.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall difficulty: 2\/5\u003c\/strong\u003e — Disconnect power before servicing. Tools needed: flathead screwdriver, needle-nose pliers, multimeter (continuity test). Inspect the rubber tubing connected to the switch port for cracks or blockages before condemning the switch itself, as blocked tubing is a common cause of pressure switch faults.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e 1-year OEM factory warranty. 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 for the Carrier \u003cstrong\u003eFIOP300501GA\u003c\/strong\u003e. Confirm the W.C. rating stamped on your existing pressure switch matches this replacement prior to installation. If you are unsure of your unit's exact pressure switch specification, our HVAC parts team can verify fitment using your full model and serial number before you order. In stock and ready to ship today — get your system back online fast.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62909504553331,"sku":"CARRIE-FIOP300501GA-PRESSURE_SWITCH-HK02ZA442","price":27.0,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62909504586099,"sku":"CARRIE-FIOP300501GA-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_d1df4054-2c89-43a1-843e-8fdbc722e4bb.jpg?v=1782924881","url":"https:\/\/nationalhvacparts.com\/products\/carrier-fiop300501ga-pressure-switch-jri7yl","provider":"National HVAC Parts","version":"1.0","type":"link"}