{"product_id":"carrier-fb4cnf018008abaa-transformer-h3hwwy","title":"OEM Carrier Transformer 40VA 120V-24V for FB4CNF018008ABAA","description":"\u003ch1\u003eOEM Carrier Control Transformer 40VA for Model FB4CNF018008ABAA\u003c\/h1\u003e\u003cp\u003eThis OEM control transformer (part# \u003cstrong\u003eHT01CN241\u003c\/strong\u003e) is the factory-specified replacement for the \u003cstrong\u003eCarrier FB4CNF018008ABAA\u003c\/strong\u003e fan coil unit. The transformer steps down 120V line voltage to 24V AC to power the low-voltage control circuit — including the thermostat, contactor coil, and any connected control boards. When this transformer fails, the entire control circuit goes dead: the thermostat goes blank, the system refuses to respond to any call for heating or cooling, and you may find a blown fuse on the control board caused by a shorted secondary winding.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e 40VA rated | Primary: 120V AC | Secondary: 24V AC | Factory-matched OEM replacement | Part Number: HT01CN241\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e OEM transformers are wound to exact VA and voltage specifications for the FB4CNF018008ABAA control circuit. Generic transformers often use lower-grade core laminations, leading to overheating under full load and premature failure — especially when accessory loads like humidifiers or UV lights share the 24V circuit.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall difficulty: 2\/5\u003c\/strong\u003e — Shut off all power to the unit before beginning. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter. Always verify 0V at the primary terminals before disconnecting wiring. Photograph all wiring connections prior to removal.\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 Engineered specifically for the \u003cstrong\u003eCarrier FB4CNF018008ABAA\u003c\/strong\u003e fan coil unit. Verify your existing transformer's VA rating and primary\/secondary voltages on the data plate before ordering. If you're unsure of fitment, our HVAC parts specialists are available to confirm compatibility before you buy — no guesswork required.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62909539090803,"sku":"CARRIE-FB4CNF018008ABAA-TRANSFORMER-HT01CN241","price":47.25,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62909539123571,"sku":"CARRIE-FB4CNF018008ABAA-TRANSFORMER-HT01CN241-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-HT01CN241_e94a33b0-6de2-4d9a-ac7d-037459ce4773.jpg?v=1782939506","url":"https:\/\/nationalhvacparts.com\/products\/carrier-fb4cnf018008abaa-transformer-h3hwwy","provider":"National HVAC Parts","version":"1.0","type":"link"}