{"product_id":"carrier-fv4cnf005l00abaa-transformer-h3hww2","title":"OEM Carrier Transformer 40VA 120V\/24V for FV4CNF005L00ABAA","description":"\u003ch1\u003eOEM Carrier Transformer 40VA 120V to 24V for Model FV4CNF005L00ABAA\u003c\/h1\u003e\u003cp\u003eThis OEM replacement transformer (part# \u003cstrong\u003eHT01CN236\u003c\/strong\u003e) is the factory-specified control circuit transformer for the \u003cstrong\u003eCarrier FV4CNF005L00ABAA\u003c\/strong\u003e fan coil air handler. The transformer steps down 120V line voltage to the 24V AC signal that powers your thermostat, control board, and all low-voltage control components. When this transformer fails, the result is total system unresponsiveness — the thermostat goes blank, the air handler won't respond to calls for heating or cooling, and nothing powers on despite the unit having line voltage. It is one of the most commonly overlooked failure points in any air handler diagnosis.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e 40VA rated | 120V primary \/ 24V secondary | Class 2 transformer | OEM part number HT01CN236 | Factory-matched for Carrier FV4CNF005L00ABAA\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, ensuring stable 24V output under full control circuit load. Undersized or off-tolerance generic units can sag voltage, causing intermittent lockouts, nuisance faults, and premature control board failure.\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 screwdriver, multimeter, wire nuts or spade connectors. Verify 0V at primary terminals before touching wiring. Photograph all connections before removal.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e 1-year OEM factory warranty. Orders placed before cutoff ship the same business day from our warehouse.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eCompatibility:\u003c\/strong\u003e Designed specifically for the Carrier \u003cstrong\u003eFV4CNF005L00ABAA\u003c\/strong\u003e fan coil air handler. Verify your existing transformer's VA rating and primary\/secondary voltages on the unit's wiring diagram or data plate before ordering. If you are unsure of fitment, our parts specialists can confirm compatibility before you purchase. In stock and ready to ship today — get your system back online fast.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62909491151219,"sku":"CARRIE-FV4CNF005L00ABAA-TRANSFORMER-HT01CN236","price":47.25,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62909491183987,"sku":"CARRIE-FV4CNF005L00ABAA-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_cb9bc17f-b310-4390-ad2f-b5d678b14aca.jpg?v=1782941148","url":"https:\/\/nationalhvacparts.com\/products\/carrier-fv4cnf005l00abaa-transformer-h3hww2","provider":"National HVAC Parts","version":"1.0","type":"link"}