{"product_id":"carrier-fv4cnb003l00abaa-transformer-h3hww2","title":"OEM Carrier Transformer 40VA 120V–24V for FV4CNB003L00ABAA","description":"\u003ch1\u003eOEM Carrier Transformer 40VA 120V–24V for Model FV4CNB003L00ABAA\u003c\/h1\u003e\u003cp\u003eThis is the factory OEM replacement transformer (part number \u003cstrong\u003eHT01CN236\u003c\/strong\u003e) for the \u003cstrong\u003eCarrier FV4CNB003L00ABAA\u003c\/strong\u003e fan coil air handler. The transformer steps down 120V line voltage to the 24V AC signal that powers your thermostat, control board, and all low-voltage switching circuits. When this component fails, the entire control circuit goes dark — your thermostat will appear dead, the system will not respond to calls for heating or cooling, and no contactors or relays will energize. It is one of the first components to check when a system shows zero control-circuit response.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e 40VA rating | 120V primary \/ 24V secondary | Class 2 transformer | OEM part number HT01CN236 | Factory-matched output for Carrier control boards\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e OEM transformers are wound and potted to exact VA tolerances required by Carrier control boards. Undersized or off-tolerance aftermarket transformers can cause nuisance trips, board damage, or chronic low-voltage faults that are difficult to diagnose.\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, wire stripper, multimeter (to confirm 24V output after install). Label and photograph all low-voltage wiring before disconnecting. Verify primary fuse or breaker is properly rated after replacement.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e 1-year OEM factory warranty against defects. In-stock units ship same business day when ordered before cutoff.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eCompatibility:\u003c\/strong\u003e Designed and factory-specified for the \u003cstrong\u003eCarrier FV4CNB003L00ABAA\u003c\/strong\u003e fan coil air handler. Always verify your unit's data plate voltage ratings match before installing. If you are unsure of fitment, our parts specialists can confirm compatibility before you order — same-day shipping available on all in-stock OEM components.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62909493379443,"sku":"CARRIE-FV4CNB003L00ABAA-TRANSFORMER-HT01CN236","price":47.25,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62909493412211,"sku":"CARRIE-FV4CNB003L00ABAA-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_24df86d3-bf1d-47d3-b576-99c042598501.jpg?v=1782941913","url":"https:\/\/nationalhvacparts.com\/products\/carrier-fv4cnb003l00abaa-transformer-h3hww2","provider":"National HVAC Parts","version":"1.0","type":"link"}