{"product_id":"carrier-ph12na018000aaaa-pressure-switch-jrhhvr","title":"OEM Carrier Pressure Switch 22#CLS 7#OPN 50\" Leads — PH12NA018000AAAA","description":"\u003ch1\u003eOEM Carrier Pressure Switch HK02ZB038 for Model PH12NA018000AAAA\u003c\/h1\u003e\u003cp\u003eThis is the factory OEM replacement pressure switch (part number \u003cstrong\u003eHK02ZB038\u003c\/strong\u003e) for the \u003cstrong\u003eCarrier PH12NA018000AAAA\u003c\/strong\u003e packaged heat pump unit. The pressure switch monitors the inducer motor's draft pressure via a rubber hose connected to the inducer housing. When the inducer reaches proper operating speed, the switch closes and signals the control board to advance through the ignition sequence. A failed pressure switch typically causes the system to lock out before any ignition attempt — you may notice a fault code, a blinking LED, or hear the inducer run continuously without the burners ever lighting. It can also fail stuck-closed, causing nuisance lockouts even when the inducer is functioning correctly.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e Closes at 22\" W.C. | Opens at 7\" W.C. | 50\" lead wire length | Single-port design | Factory-matched switching setpoints for Carrier PH12NA018000AAAA\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e OEM pressure switches maintain precise calibrated setpoints (±0.1\" W.C.). Generic alternatives often drift outside tolerance, causing intermittent or false lockouts that are difficult to diagnose.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall difficulty: 2\/5\u003c\/strong\u003e — Power down the unit before servicing. Tools needed: 1\/4\" nut driver, needle-nose pliers, and a multimeter set to continuity. Disconnect the hose from the inducer port, unplug the two-wire harness, and swap in the new switch. Always inspect the rubber hose for cracks or blockage before replacing the switch.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e 1-year OEM manufacturer warranty against defects. Ships same business day from our warehouse when ordered by 3PM local time.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eCompatibility:\u003c\/strong\u003e Direct OEM replacement for Carrier model \u003cstrong\u003ePH12NA018000AAAA\u003c\/strong\u003e packaged heat pump units. Verify your existing switch's closing and opening setpoints against the data label on the switch body before ordering. Cross-reference: PS80-02-F0074. Need help confirming fitment? Our HVAC parts specialists verify compatibility before every order — in stock and ready to ship today.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62641973363059,"sku":"CARRIE-PH12NA018000AAAA-PRESSURE_SWITCH-HK02ZB038","price":57.95,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62641973395827,"sku":"CARRIE-PH12NA018000AAAA-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_d6d3ea70-25e0-4d51-a397-1abeba2ee667.jpg?v=1775036921","url":"https:\/\/nationalhvacparts.com\/products\/carrier-ph12na018000aaaa-pressure-switch-jrhhvr","provider":"National HVAC Parts","version":"1.0","type":"link"}