{"product_id":"carrier-fb4bnf024010aaaa-transformer-h3hwwy","title":"OEM Carrier Transformer 40VA 24V for FB4BNF024010AAAA — HT01CN241","description":"\u003ch1\u003eOEM Carrier 40VA Control Transformer HT01CN241 for Model FB4BNF024010AAAA\u003c\/h1\u003e\u003cp\u003eThis OEM control transformer (part number \u003cstrong\u003eHT01CN241\u003c\/strong\u003e) is the factory-specified replacement for the \u003cstrong\u003eCarrier FB4BNF024010AAAA\u003c\/strong\u003e fan coil air handler. The transformer steps down incoming 120V line voltage to the 24V AC signal that powers your thermostat, control board, and all low-voltage control circuits. When the transformer fails — due to a shorted control board, wiring fault, or age — absolutely nothing in the system responds: the thermostat goes blank, the air handler won't start, and the condenser locks out. Replacing the transformer is often the first diagnostic step when an otherwise-healthy system goes completely unresponsive.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e 40VA rating | 120V primary \/ 24V secondary | Class 2 output | Direct OEM replacement for part number HT01CN241 | Factory-matched impedance and thermal protection\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e The OEM HT01CN241 is built to Carrier's exact VA rating and thermal cutout specification. Undersized or off-brand transformers can overheat, trip repeatedly, or fail to supply adequate current to multi-zone or communicating thermostat systems — a common cause of callbacks after DIY repairs.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall difficulty: 2\/5\u003c\/strong\u003e — Turn off power at the breaker and verify zero voltage with a multimeter before touching any wiring. Tools needed: flathead and Phillips screwdrivers, wire nuts or spade terminals, multimeter. Always note or photograph existing low-voltage wire connections before disconnecting. Secondary output should read 24–28V AC once reinstalled.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e 1-year OEM factory warranty against defects. Orders placed before cutoff ship same business day from our warehouse.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eCompatibility:\u003c\/strong\u003e This transformer is engineered specifically for the \u003cstrong\u003eCarrier FB4BNF024010AAAA\u003c\/strong\u003e fan coil air handler. Confirm the 40VA, 120V\/24V specification on your unit's wiring diagram or data plate before ordering. If you're unsure of fitment, our HVAC parts specialists can verify compatibility before you purchase — no guesswork required. In stock and ready to ship today.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62909541187955,"sku":"CARRIE-FB4BNF024010AAAA-TRANSFORMER-HT01CN241","price":47.25,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62909541220723,"sku":"CARRIE-FB4BNF024010AAAA-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_7d64166e-c7a3-49d0-b17d-b54c6c7e8b71.jpg?v=1782942539","url":"https:\/\/nationalhvacparts.com\/products\/carrier-fb4bnf024010aaaa-transformer-h3hwwy","provider":"National HVAC Parts","version":"1.0","type":"link"}