{"product_id":"carrier-fc4bnb048000agaa-transformer-h3hww2","title":"OEM Carrier Transformer 40VA 120V\/24V for FC4BNB048000AGAA","description":"\u003ch1\u003eOEM Carrier 40VA Control Transformer for Model FC4BNB048000AGAA\u003c\/h1\u003e\u003cp\u003eThis is the OEM factory-specified control transformer (part number \u003cstrong\u003eHT01CN236\u003c\/strong\u003e) for the \u003cstrong\u003eCarrier FC4BNB048000AGAA\u003c\/strong\u003e fan coil unit. The transformer steps down line voltage from 120V to the 24V signal used by your thermostat, control board, contactor coil, and all low-voltage safety circuits. When this component fails, the entire control circuit goes dead — your thermostat will appear unresponsive, the system won't call for heating or cooling, and no safety faults will be reported because the board itself has lost power. A blown fuse or shorted low-voltage wire are common culprits that overload and burn out the transformer.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e Input 120V AC | Output 24V AC | 40VA rated | OEM part number HT01CN236 | Factory-matched construction for Carrier fan coil applications\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e The OEM HT01CN236 transformer is wound to exact VA and impedance specs for this unit. Generic transformers frequently underrate their VA capacity, causing overheating and premature failure — especially when multiple zone valves or accessories are on the 24V circuit.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall difficulty: 2\/5\u003c\/strong\u003e — Shut off all power at the breaker before beginning. Tools needed: flathead and Phillips screwdrivers, multimeter, wire nuts or terminal connectors. Verify primary and secondary voltages with a multimeter after installation before restoring full system power. Always inspect low-voltage wiring for shorts before installing a new transformer.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e 1-year OEM factory warranty. 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 specifically for the Carrier \u003cstrong\u003eFC4BNB048000AGAA\u003c\/strong\u003e fan coil unit. Confirm your existing transformer's input\/output voltage and VA rating on the data plate or wiring diagram before ordering. If you have any questions about fitment, our HVAC parts specialists verify compatibility before you buy — no guesswork required.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62909530931571,"sku":"CARRIE-FC4BNB048000AGAA-TRANSFORMER-HT01CN236","price":47.25,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62909530964339,"sku":"CARRIE-FC4BNB048000AGAA-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_ceac17fb-199a-431f-a39d-331cc3481a67.jpg?v=1782940956","url":"https:\/\/nationalhvacparts.com\/products\/carrier-fc4bnb048000agaa-transformer-h3hww2","provider":"National HVAC Parts","version":"1.0","type":"link"}