{"product_id":"carrier-ha1bjx018000aaaa-transformer-h4oyjb","title":"OEM Carrier Transformer 40VA 120V-24V for HA1BJX018000AAAA","description":"\u003ch1\u003eOEM Carrier 40VA Control Transformer for Model HA1BJX018000AAAA\u003c\/h1\u003e\u003cp\u003eThis OEM replacement transformer (part# \u003cstrong\u003eHT01AW229\u003c\/strong\u003e) is the factory-specified 40VA step-down transformer for the \u003cstrong\u003eCarrier HA1BJX018000AAAA\u003c\/strong\u003e air handler unit. The transformer converts 120V line voltage to the 24V AC signal that powers the entire low-voltage control circuit — including the thermostat, contactor coil, and control board. When this component fails, the system goes completely dark: the thermostat loses power, no calls for heating or cooling are processed, and the unit will not start under any condition. A failed transformer is often the first diagnosis when nothing in the system responds.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e 40VA rating | 120V primary \/ 24V secondary | OEM part number HT01AW229 | Factory-matched output tolerance for stable control circuit voltage\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e This is the genuine Carrier OEM transformer, wound and rated to exact factory specifications. Generic transformers may carry lower VA ratings or inconsistent secondary voltage, which can cause nuisance lockouts, board damage, or premature contactor coil failure.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall difficulty: 2\/5\u003c\/strong\u003e — Disconnect power at the breaker before beginning. Tools needed: flathead and Phillips screwdrivers, multimeter, wire nuts or terminal connectors. Verify 24V output with a multimeter before reassembling the cabinet. Always label or photograph wiring prior to removal.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e 1-year OEM factory warranty against defects. Orders placed before cutoff ship the same business day from our stocked warehouse.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eCompatibility:\u003c\/strong\u003e Designed specifically for the Carrier \u003cstrong\u003eHA1BJX018000AAAA\u003c\/strong\u003e air handler. Confirm your unit's data plate lists a 40VA, 120V\/24V transformer requirement before ordering. Our parts specialists are available to verify fitment — reach out before you buy for complete peace of mind. In stock and ready to ship today.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62909367943539,"sku":"CARRIE-HA1BJX018000AAAA-TRANSFORMER-HT01AW229","price":47.25,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62909367976307,"sku":"CARRIE-HA1BJX018000AAAA-TRANSFORMER-HT01AW229-GEN","price":18.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0984\/1190\/5395\/files\/nhvac-transformer-control-HT01AW229_fb3def64-e236-48d3-af23-cb25dc196590.jpg?v=1782939870","url":"https:\/\/nationalhvacparts.com\/products\/carrier-ha1bjx018000aaaa-transformer-h4oyjb","provider":"National HVAC Parts","version":"1.0","type":"link"}