{"product_id":"carrier-fb4anf030000afaa-transformer-h3hww2","title":"OEM Carrier Transformer 40VA 120V\/24V for FB4ANF030000AFAA","description":"\u003ch1\u003eOEM Carrier 40VA Control Transformer for Model FB4ANF030000AFAA Air Handler\u003c\/h1\u003e\u003cp\u003eThis OEM replacement transformer (part# \u003cstrong\u003eHT01CN236\u003c\/strong\u003e) is the factory-specified control transformer for the \u003cstrong\u003eCarrier FB4ANF030000AFAA\u003c\/strong\u003e fan coil air handler. The transformer steps down 120V line voltage to 24V AC to power the low-voltage control circuit — including the thermostat, contactor coil, and control board. When this transformer fails, the entire control circuit goes dead: your thermostat displays nothing or the system simply refuses to respond to any call for heating or cooling. A failed transformer is often identified by a blown fuse on the control board or a burned, shorted winding detected with a multimeter.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e 40VA rated | Primary: 120V AC | Secondary: 24V AC | Factory-matched windings for Carrier FB4ANF030000AFAA | OEM Part Number: HT01CN236\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e This is the genuine OEM Carrier transformer wound to exact factory VA and voltage tolerances. Generic transformers frequently run undersized VA ratings, causing premature thermal cutout trips and repeated control circuit failures — especially under high-demand multi-zone systems.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall Difficulty: 2\/5\u003c\/strong\u003e — Disconnect all power to the air handler before beginning. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter (to confirm 24V output post-install). Photograph or label all low-voltage wiring connections before removal. The transformer typically mounts to the control bracket with two screws and uses push-on or screw-terminal low-voltage leads.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e 1-year OEM factory warranty against defects. In stock and ships same business day from our climate-controlled warehouse.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eCompatibility:\u003c\/strong\u003e Designed specifically for the Carrier \u003cstrong\u003eFB4ANF030000AFAA\u003c\/strong\u003e fan coil air handler. Always verify your existing transformer's VA rating and primary\/secondary voltages on the unit data plate before ordering to ensure a correct fit. Not sure it's the right part? Our HVAC parts specialists confirm fitment before you buy — order with confidence and get your system back online today.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62909544497523,"sku":"CARRIE-FB4ANF030000AFAA-TRANSFORMER-HT01CN236","price":47.25,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62909544530291,"sku":"CARRIE-FB4ANF030000AFAA-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_a7ef7df0-bc34-4314-b780-32c7c9f32a6a.jpg?v=1782940884","url":"https:\/\/nationalhvacparts.com\/products\/carrier-fb4anf030000afaa-transformer-h3hww2","provider":"National HVAC Parts","version":"1.0","type":"link"}