{"product_id":"carrier-ph12na01800gadaa-pressure-switch-jrhhvr","title":"OEM Carrier Pressure Switch 22#CLS 7#OPN 50\" Leads — PH12NA01800GADAA","description":"\u003ch1\u003eOEM Carrier Pressure Switch HK02ZB038 for Model PH12NA01800GADAA\u003c\/h1\u003e\u003cp\u003eThis is the factory-specified OEM pressure switch (part number \u003cstrong\u003eHK02ZB038\u003c\/strong\u003e) for the \u003cstrong\u003eCarrier PH12NA01800GADAA\u003c\/strong\u003e packaged unit. The pressure switch monitors the negative pressure (draft) produced by the inducer motor to confirm proper venting before allowing the gas valve to open. If the switch fails to close — or sticks open — the control board will lock out ignition entirely, resulting in a no-heat condition. Common symptoms include the inducer running but no spark or gas, a fault code indicating a pressure switch error, or the system cycling on and off without ever reaching ignition.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e Closing setpoint: \u003cstrong\u003e-0.22\" W.C. (22# CLS)\u003c\/strong\u003e | Opening setpoint: \u003cstrong\u003e-0.07\" W.C. (7# OPN)\u003c\/strong\u003e | Lead length: \u003cstrong\u003e50\"\u003c\/strong\u003e | Single-port, normally open configuration\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e This OEM unit is factory-calibrated to exact W.C. setpoints for the PH12NA01800GADAA. Aftermarket pressure switches frequently drift outside tolerance, causing nuisance lockouts or — worse — allowing ignition attempts with inadequate draft, creating a carbon monoxide risk.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall difficulty: 2\/5\u003c\/strong\u003e — Shut off power and gas before servicing. Tools needed: flathead screwdriver, needle-nose pliers, manometer (recommended for post-install verification). Disconnect the hose port and two spade terminals, swap the switch, and confirm setpoints with a manometer if available.\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 Carrier model \u003cstrong\u003ePH12NA01800GADAA\u003c\/strong\u003e. Always verify the W.C. rating on your unit's existing pressure switch or wiring diagram before ordering. Our fitment specialists are available to confirm compatibility before you buy — ships today when ordered before 3 PM.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62641970184563,"sku":"CARRIE-PH12NA01800GADAA-PRESSURE_SWITCH-HK02ZB038","price":57.95,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62641970217331,"sku":"CARRIE-PH12NA01800GADAA-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_32b76b8c-8ac9-4e36-9f50-1d5a74e9de90.jpg?v=1775036923","url":"https:\/\/nationalhvacparts.com\/products\/carrier-ph12na01800gadaa-pressure-switch-jrhhvr","provider":"National HVAC Parts","version":"1.0","type":"link"}