{"product_id":"carrier-hc1bnx036000aaaa-transformer-h4oyjb","title":"OEM Carrier Transformer 40VA 120V\/24V for HC1BNX036000AAAA","description":"\u003ch1\u003eOEM Carrier 40VA Control Transformer for Model HC1BNX036000AAAA\u003c\/h1\u003e\u003cp\u003eThis is the factory OEM replacement transformer (part number \u003cstrong\u003eHT01AW229\u003c\/strong\u003e) for the \u003cstrong\u003eCarrier HC1BNX036000AAAA\u003c\/strong\u003e fan coil unit. The transformer steps down 120V line voltage to the 24V AC signal that powers your thermostat, control board, and all low-voltage switching logic. When this component fails, the entire control circuit goes dark — your thermostat loses power, the system won't respond to any call for heating or cooling, and no error codes will display because the board itself has no power to report them.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e 40VA rated | Primary: 120V AC | Secondary: 24V AC | OEM part number HT01AW229 | Factory-matched for Carrier HC1BNX036000AAAA fan coil units\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e OEM transformers are wound to exact VA and voltage tolerances required by the Carrier control board. Undersized or off-tolerance generic units can cause nuisance tripping, erratic thermostat behavior, or premature board failure — OEM is the only safe choice for this application.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall difficulty: 2\/5\u003c\/strong\u003e — Shut off all power at the disconnect and breaker before beginning. Tools needed: flathead and Phillips screwdrivers, wire nuts or spade connectors, multimeter to verify 24V output after installation. Label all wires before disconnecting the old unit.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e 1-year OEM factory 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 Designed and factory-specified for the Carrier \u003cstrong\u003eHC1BNX036000AAAA\u003c\/strong\u003e fan coil unit. Always verify your existing transformer's VA rating and primary\/secondary voltages against your unit's data plate before ordering. Have questions about fitment? Our HVAC parts specialists confirm compatibility before you buy — call or chat today and get your system back online fast.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62909339566451,"sku":"CARRIE-HC1BNX036000AAAA-TRANSFORMER-HT01AW229","price":47.25,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62909339599219,"sku":"CARRIE-HC1BNX036000AAAA-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_db61a092-8a56-4dfe-b33d-bde80c1c27bd.jpg?v=1782941594","url":"https:\/\/nationalhvacparts.com\/products\/carrier-hc1bnx036000aaaa-transformer-h4oyjb","provider":"National HVAC Parts","version":"1.0","type":"link"}