{"product_id":"carrier-fb4cnp024t00aaaa-transformer-h3hwwy","title":"OEM Carrier Transformer 40VA 120V\/24V for FB4CNP024T00AAAA","description":"\u003ch1\u003eOEM Carrier 40VA Control Transformer for Model FB4CNP024T00AAAA Air Handler\u003c\/h1\u003e\u003cp\u003eThis OEM control transformer (part# \u003cstrong\u003eHT01CN241\u003c\/strong\u003e) is the factory-specified replacement for the \u003cstrong\u003eCarrier FB4CNP024T00AAAA\u003c\/strong\u003e fan coil air handler. The transformer steps down 120V line voltage to 24V AC, powering the entire low-voltage control circuit — including the thermostat, contactor coil, and control board. When it fails, the result is total loss of control power: your thermostat goes blank, the system won't respond to any commands, and no heating or cooling occurs. A blown transformer is often caused by a short in the low-voltage wiring, so always inspect the 24V circuit before installing the replacement.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e 40VA rating | Primary: 120V AC | Secondary: 24V AC | OEM Part Number: HT01CN241 | Factory-matched output for Carrier low-voltage control circuits\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e This OEM transformer meets Carrier's exact VA rating and insulation class. Undersized or off-brand transformers can overheat, blow the secondary fuse repeatedly, or deliver unstable voltage that causes nuisance lockouts on the control board.\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, multimeter, wire nuts or spade connectors. Verify incoming 120V and outgoing 24V with a multimeter after installation before restoring full system power.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e 1-year OEM factory warranty against defects. Ships same business day from our stocked warehouse.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eCompatibility:\u003c\/strong\u003e Designed specifically for the \u003cstrong\u003eCarrier FB4CNP024T00AAAA\u003c\/strong\u003e fan coil air handler. Always confirm OEM part number HT01CN241 and verify 120V primary \/ 24V secondary 40VA rating against your unit's wiring diagram before ordering. Our fitment team is available to confirm compatibility prior to purchase — orders placed before 3 PM ship the same business day.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62909534044531,"sku":"CARRIE-FB4CNP024T00AAAA-TRANSFORMER-HT01CN241","price":47.25,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62909534077299,"sku":"CARRIE-FB4CNP024T00AAAA-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_9979cfa2-d65e-465c-b93d-6059295826eb.jpg?v=1782940938","url":"https:\/\/nationalhvacparts.com\/products\/carrier-fb4cnp024t00aaaa-transformer-h3hwwy","provider":"National HVAC Parts","version":"1.0","type":"link"}