{"product_id":"carrier-ph12na048000aaaa-pressure-switch-jrhhvr","title":"OEM Carrier Pressure Switch 22#CLS 7#OPN 50\" Leads — PH12NA048000AAAA","description":"\u003ch1\u003eOEM Carrier Pressure Switch HK02ZB038 for Model PH12NA048000AAAA\u003c\/h1\u003e\u003cp\u003eThis is the genuine OEM Carrier pressure switch (part number \u003cstrong\u003eHK02ZB038\u003c\/strong\u003e), factory-specified for the \u003cstrong\u003eCarrier PH12NA048000AAAA\u003c\/strong\u003e packaged heat pump unit. The pressure switch is a normally-open safety device that monitors the inducer motor's draft pressure. Once the inducer establishes proper negative pressure in the heat exchanger, the switch closes and signals the control board to proceed with the ignition sequence. When this switch fails — or when the hose, port, or inducer itself is at fault — the system locks out before ignition, leaving you with no heat and a diagnostic fault code.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecifications:\u003c\/strong\u003e 22 PSI close | 7 PSI open | 50\" lead wires | Normally open (NO) configuration | Factory-matched setpoints for Carrier PH12NA packaged units\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e The OEM HK02ZB038 is calibrated to exact factory pressure setpoints. Off-brand substitutes frequently exhibit ±5–10% pressure drift, causing nuisance lockouts or — worse — failing to open on a true over-pressure event, which can damage the heat exchanger.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall difficulty: 2\/5\u003c\/strong\u003e — Disconnect power before servicing. Locate the switch on the inducer housing, disconnect the hose barb and two wire leads, and swap in the new switch. Tools needed: 1\/4\" nut driver, needle-nose pliers. Always inspect the rubber hose and port for cracks or blockage before condemning the switch.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e 1-year OEM manufacturer warranty against defects. In stock and ships same business day from our warehouse.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eCompatibility:\u003c\/strong\u003e Direct OEM replacement for \u003cstrong\u003eCarrier PH12NA048000AAAA\u003c\/strong\u003e packaged heat pump units. Verify your existing switch's open\/close pressure ratings and lead length against your unit's data plate before ordering. Our HVAC parts specialists are available to confirm fitment — order with confidence and get back up and running today.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62641949376883,"sku":"CARRIE-PH12NA048000AAAA-PRESSURE_SWITCH-HK02ZB038","price":57.95,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62641949409651,"sku":"CARRIE-PH12NA048000AAAA-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_dffe5d56-c626-4169-b184-8d51e2aa3023.jpg?v=1775036957","url":"https:\/\/nationalhvacparts.com\/products\/carrier-ph12na048000aaaa-pressure-switch-jrhhvr","provider":"National HVAC Parts","version":"1.0","type":"link"}