{"product_id":"carrier-transformer-fx4dnb031t00aaaa","title":"OEM Carrier Transformer Replacement Part for Model FX4DNB031T00AAAA","description":"\u003cdiv\u003e\n\u003ch1\u003eOEM Carrier Transformer Replacement Part for Model FX4DNB031T00AAAA\u003c\/h1\u003e\n\u003cp\u003eThis genuine OEM Carrier transformer is the factory-specified replacement for the FX4DNB031T00AAAA fan coil air handler. The transformer reduces incoming line voltage to the 24V control voltage that powers your thermostat, control board, and safety circuits. When a transformer burns out, the system commonly goes dead at the thermostat even though high-voltage power remains present, so the right replacement brings control operation back. Manufactured to Carrier's exact electrical and mechanical standards, this part matches the original mounting and terminals on the FX4DNB031T00AAAA, installing without adapters or rewiring. The job is moderate in difficulty and ideal for a qualified HVAC technician: cut power, document the wire positions, mount the replacement transformer, and land the primary and secondary leads correctly. Choosing OEM guarantees the proper secondary voltage and shields your control board from the damage that mismatched universal transformers can cause. We keep this unit stocked and ship same-day on all orders placed before 3PM CST, cutting your downtime to a minimum. Rely on authentic Carrier components for a durable, accurate repair.\u003c\/p\u003e\n\u003ch2\u003eCompatibility\u003c\/h2\u003e\n\u003cp\u003eThis part is compatible with Carrier model FX4DNB031T00AAAA.\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":62942889050483,"sku":"carrier-transformer-fx4dnb031t00aaaa","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_4f537cfd-b932-45a8-8a80-d0a87613c4a5.jpg?v=1781474259","url":"https:\/\/nationalhvacparts.com\/products\/carrier-transformer-fx4dnb031t00aaaa","provider":"National HVAC Parts","version":"1.0","type":"link"}