{"product_id":"carrier-fv4cnb005t00abaa-transformer-h3hww2","title":"OEM Carrier Transformer 40VA 120V\/24V for FV4CNB005T00ABAA","description":"\u003ch1\u003eOEM Carrier Transformer 40VA 120V to 24V for Model FV4CNB005T00ABAA\u003c\/h1\u003e\u003cp\u003eThis OEM replacement transformer (part number \u003cstrong\u003eHT01CN236\u003c\/strong\u003e) is the factory-specified control circuit transformer for the \u003cstrong\u003eCarrier FV4CNB005T00ABAA\u003c\/strong\u003e fan coil air handler. The transformer steps down 120V line voltage to the 24V signal voltage required to power your thermostat, control board, and all low-voltage switching circuits. When this component fails, the result is typically a completely unresponsive system — the thermostat goes dark, the air handler won't respond to any calls for heating or cooling, and no control functions operate. A failed transformer is often misdiagnosed as a control board failure, making this an essential first diagnostic check.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e 40VA rated | Primary: 120V AC | Secondary: 24V AC | OEM part number HT01CN236 | Direct drop-in fit for Carrier FV4CNB005T00ABAA air handler\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e This OEM transformer is wound to exact factory VA ratings and insulation class, ensuring stable 24V output under full control circuit load. Generic transformers frequently run undervoltage under load, causing erratic contactor chatter, nuisance lockouts, 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 screwdrivers, wire stripper, multimeter. Note wire colors and terminal positions before removing the old unit. Verify 24V output at secondary terminals before reassembling the panel.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e 1-year OEM factory warranty against defects in materials and workmanship. In stock and ships 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\u003eFV4CNB005T00ABAA\u003c\/strong\u003e fan coil air handler. Confirm your existing transformer's VA rating and primary\/secondary voltages on the unit data plate or old transformer label before ordering. Our HVAC parts specialists are available to verify fitment — order with confidence and get back to comfort fast.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62909492822387,"sku":"CARRIE-FV4CNB005T00ABAA-TRANSFORMER-HT01CN236","price":47.25,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62909492855155,"sku":"CARRIE-FV4CNB005T00ABAA-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_8e6a56f8-d03c-497c-b9d8-a5c18afcc25a.jpg?v=1782941128","url":"https:\/\/nationalhvacparts.com\/products\/carrier-fv4cnb005t00abaa-transformer-h3hww2","provider":"National HVAC Parts","version":"1.0","type":"link"}