{"product_id":"carrier-transformer-fx4dnb043l00acaa","title":"OEM Carrier Transformer Replacement Part for Model FX4DNB043L00ACAA","description":"\u003cdiv\u003e\n\u003ch1\u003eOEM Carrier Transformer Replacement Part for Model FX4DNB043L00ACAA\u003c\/h1\u003e\n\u003cp\u003eThis genuine OEM Carrier transformer is the factory replacement for the FX4DNB043L00ACAA fan coil air handler. Its job is to convert incoming line voltage into the 24V low-voltage power your thermostat and control board rely on. A burned-out transformer is one of the most common causes of a system that shows no response at the thermostat despite having power at the disconnect, so installing the correct unit brings the entire control circuit back to life. Built to Carrier's precise VA rating and terminal layout, this transformer mounts and wires exactly like the original in the FX4DNB043L00ACAA — no adapters or rewiring required. Replacement is a moderate-difficulty job suited to a service tech: cut power, capture the existing wire positions, mount the new transformer, and land the primary and secondary leads. Choosing OEM guarantees the right secondary voltage and prevents the control-board damage that mismatched universal transformers can cause. We stock this part and ship it same-day when you order before 3PM CST, minimizing downtime on your air handler. Genuine Carrier reliability you can trust.\u003c\/p\u003e\n\u003ch2\u003eCompatibility\u003c\/h2\u003e\n\u003cp\u003eThis part is compatible with Carrier model FX4DNB043L00ACAA.\u003c\/p\u003e\n\u003ch2\u003eShipping\u003c\/h2\u003e\n\u003cp\u003eSame-day shipping before 3 PM CST. 30-day returns on uninstalled parts.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"Carrier","offers":[{"title":"Default Title","offer_id":62942888853875,"sku":"carrier-transformer-fx4dnb043l00acaa","price":49.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0984\/1190\/5395\/files\/nhvac-transformer-carrier-transformer-fx_c2dde7af-de21-43bb-b77b-c4db508d0b32.jpg?v=1781474268","url":"https:\/\/nationalhvacparts.com\/products\/carrier-transformer-fx4dnb043l00acaa","provider":"National HVAC Parts","version":"1.0","type":"link"}