{"product_id":"carrier-fb4anf048010afaa-transformer-h3hww2","title":"OEM Carrier Transformer 40VA 120V\/24V for FB4ANF048010AFAA","description":"\u003ch1\u003eOEM Carrier 40VA Control Transformer for Model FB4ANF048010AFAA\u003c\/h1\u003e\u003cp\u003eThis is the factory-original OEM replacement transformer (part number \u003cstrong\u003eHT01CN236\u003c\/strong\u003e) for the \u003cstrong\u003eCarrier FB4ANF048010AFAA\u003c\/strong\u003e fan coil air handler. The control transformer steps down 120V line voltage to 24V to power the low-voltage control circuit — including the thermostat, contactor coil, and control board. When this transformer fails, the entire control circuit goes dark: the thermostat loses power, the system stops responding to calls for cooling or heating, and nothing works. A failed transformer is often misdiagnosed as a thermostat or control board issue, so always test transformer output voltage first.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e 40VA rating | Primary: 120V | Secondary: 24V | OEM part number HT01CN236 | Direct factory replacement with matched impedance and thermal protection\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 Carrier control circuit. Undersized or off-tolerance generic units can overheat, trip thermal protection repeatedly, or damage the control board by delivering unstable voltage.\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 quick-connects. Label or photograph all low-voltage wiring before disconnecting. Confirm 120V input and 24V output with a multimeter after installation before closing the unit.\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 stocked warehouse.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eCompatibility:\u003c\/strong\u003e Designed specifically for the Carrier \u003cstrong\u003eFB4ANF048010AFAA\u003c\/strong\u003e fan coil air handler. Verify the transformer VA rating and primary\/secondary voltages on your unit's data plate before ordering. If you're unsure of fitment, our HVAC parts specialists can confirm compatibility before you buy — same-day shipping available on all in-stock orders.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62909542891891,"sku":"CARRIE-FB4ANF048010AFAA-TRANSFORMER-HT01CN236","price":47.25,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62909542924659,"sku":"CARRIE-FB4ANF048010AFAA-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_cc8d15db-e308-4b76-8052-5c94284bcea3.jpg?v=1782940892","url":"https:\/\/nationalhvacparts.com\/products\/carrier-fb4anf048010afaa-transformer-h3hww2","provider":"National HVAC Parts","version":"1.0","type":"link"}