{"product_id":"carrier-fv4cnb005t00aaaa-transformer-h3hww2","title":"OEM Carrier Transformer 40VA 120V\/24V for FV4CNB005T00AAAA","description":"\u003ch1\u003eOEM Carrier Transformer 40VA 120V to 24V for Model FV4CNB005T00AAAA\u003c\/h1\u003e\u003cp\u003eThis is the OEM factory-replacement transformer (part number \u003cstrong\u003eHT01CN236\u003c\/strong\u003e) for the \u003cstrong\u003eCarrier FV4CNB005T00AAAA\u003c\/strong\u003e fan coil air handler. The transformer steps down 120V line voltage to the 24V signal voltage required to power the control board, thermostat, and all low-voltage switching circuits. When it fails, the entire control circuit goes dark — your thermostat becomes unresponsive, the system refuses to start, and no fault codes appear because there is no power to generate them. Replacing a failed transformer is one of the most cost-effective repairs in HVAC service.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e 40VA rating | Primary: 120VAC | Secondary: 24VAC | OEM part number HT01CN236 | Factory-matched output voltage and VA capacity\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 FV4CNB005T00AAAA control board. Under-rated or off-tolerance generic transformers can overheat, trip internal thermal protection, or damage downstream control components over time.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall difficulty: 2\/5\u003c\/strong\u003e — Always shut off power at the breaker and disconnect the unit before beginning. Tools needed: flathead and Phillips screwdrivers, wire stripper, multimeter. Confirm 0V at primary terminals before touching wiring. Document or photograph all wire connections before removal.\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 as a direct OEM replacement for the Carrier \u003cstrong\u003eFV4CNB005T00AAAA\u003c\/strong\u003e fan coil air handler. Verify your existing transformer's primary voltage (120V), secondary voltage (24V), and VA rating on the unit data plate or existing component label before ordering. Our parts specialists are available to confirm fitment — order with confidence and get your system running today.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62909492986227,"sku":"CARRIE-FV4CNB005T00AAAA-TRANSFORMER-HT01CN236","price":47.25,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62909493018995,"sku":"CARRIE-FV4CNB005T00AAAA-TRANSFORMER-HT01CN236-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-HT01CN236_4e14b455-f0b7-483c-800a-87727b91a71c.jpg?v=1782941125","url":"https:\/\/nationalhvacparts.com\/products\/carrier-fv4cnb005t00aaaa-transformer-h3hww2","provider":"National HVAC Parts","version":"1.0","type":"link"}