{"product_id":"carrier-fv4anf003000aaaa-transformer-h3hww2","title":"OEM Carrier Transformer 40VA 120V\/24V for FV4ANF003000AAAA","description":"\u003ch1\u003eOEM Carrier Control Transformer 40VA 120V to 24V for Model FV4ANF003000AAAA\u003c\/h1\u003e\u003cp\u003eThis is the OEM factory-specified replacement transformer (part number \u003cstrong\u003eHT01CN236\u003c\/strong\u003e) for the \u003cstrong\u003eCarrier FV4ANF003000AAAA\u003c\/strong\u003e fan coil air handler. The transformer steps down line voltage (120V) to the 24V low-voltage signal used by the control board, thermostat, and all switching circuits. When this transformer fails, the entire control circuit loses power — the result is a completely unresponsive system: no thermostat communication, no blower response, and no heating or cooling function whatsoever.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e 40VA rating | Primary: 120V | Secondary: 24V | OEM part number HT01CN236 | Factory-matched for Carrier FV4ANF003000AAAA air handler control circuit\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e OEM transformers are wound and rated to exact factory VA specifications, protecting downstream control boards and thermostats from voltage fluctuation. Generic alternatives may run under-rated VA, causing premature burnout or nuisance tripping of the control board's fuse.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall difficulty: 2\/5\u003c\/strong\u003e — Shut off all power at the breaker before servicing. Tools needed: flathead and Phillips screwdrivers, wire stripper, multimeter. Label or photograph all low-voltage wiring before disconnecting. Verify 24V output with a multimeter after installation before restoring system power.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e 1-year OEM factory warranty. 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 for the Carrier \u003cstrong\u003eFV4ANF003000AAAA\u003c\/strong\u003e fan coil air handler. Confirm your existing transformer's VA rating and primary\/secondary voltages on the unit's data plate or wiring diagram before ordering. If your system shows a blown fuse on the control board alongside transformer failure, inspect for a short in the low-voltage wiring before replacing. Our fitment team is available to verify compatibility before you order — reach out with your model and serial number for a confirmed match.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62909496263027,"sku":"CARRIE-FV4ANF003000AAAA-TRANSFORMER-HT01CN236","price":47.25,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62909496295795,"sku":"CARRIE-FV4ANF003000AAAA-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_478ce1d1-55e6-4c6d-a445-95cad38d8330.jpg?v=1782941105","url":"https:\/\/nationalhvacparts.com\/products\/carrier-fv4anf003000aaaa-transformer-h3hww2","provider":"National HVAC Parts","version":"1.0","type":"link"}