{"product_id":"carrier-ph12na048000adaa-pressure-switch-jrhhvr","title":"OEM Carrier Pressure Switch 22#CLS 7#OPN 50\" Leads — PH12NA048000ADAA","description":"\u003ch1\u003eOEM Carrier Pressure Switch HK02ZB038 for Model PH12NA048000ADAA\u003c\/h1\u003e\u003cp\u003eThis OEM pressure switch (part number \u003cstrong\u003eHK02ZB038\u003c\/strong\u003e) is the factory-specified replacement for the \u003cstrong\u003eCarrier PH12NA048000ADAA\u003c\/strong\u003e packaged heating and cooling unit. The pressure switch monitors inducer motor operation by sensing negative pressure inside the flue collector box. Once adequate draft is proven, it closes and signals the control board to advance through the ignition sequence. When this switch fails — or the pressure it monitors is out of range — the system locks out before the burners ever fire, leaving you with no heat.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e Closing setpoint: \u003cstrong\u003e-22\" W.C.\u003c\/strong\u003e | Opening setpoint: \u003cstrong\u003e-7\" W.C.\u003c\/strong\u003e | Lead length: \u003cstrong\u003e50\"\u003c\/strong\u003e | Single-port, normally open | OEM Part Number: \u003cstrong\u003eHK02ZB038\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e This is a genuine Carrier OEM switch manufactured to exact W.C. setpoint tolerances. Aftermarket switches often carry ±15% tolerance on trip points, which can cause nuisance lockouts or — worse — allow unsafe inducer conditions to go undetected.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall difficulty: 2\/5\u003c\/strong\u003e — Power down the unit at the disconnect before starting. Tools needed: flat-head screwdriver, needle-nose pliers, and a manometer (recommended to verify pressure after install). Swap the hose from the old switch to the new, reconnect the two-wire harness, and restore power. Always inspect the rubber hose for cracks while the switch is out.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e 1-year OEM factory warranty against manufacturing defects. Ships same business day from our warehouse when ordered before 3 PM local time.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eCompatibility:\u003c\/strong\u003e Engineered for the Carrier \u003cstrong\u003ePH12NA048000ADAA\u003c\/strong\u003e packaged unit. Always cross-reference the W.C. rating stamped on your existing switch and confirm the part number on your unit's wiring diagram before ordering. Our HVAC parts specialists are available to verify fitment — order with confidence and get your system back online fast.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62641947738483,"sku":"CARRIE-PH12NA048000ADAA-PRESSURE_SWITCH-HK02ZB038","price":57.95,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62641947771251,"sku":"CARRIE-PH12NA048000ADAA-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_5061e95c-59a9-4492-9cab-153025a348d3.jpg?v=1775036960","url":"https:\/\/nationalhvacparts.com\/products\/carrier-ph12na048000adaa-pressure-switch-jrhhvr","provider":"National HVAC Parts","version":"1.0","type":"link"}