{"product_id":"carrier-transformer-fb4bnf042010aaaa","title":"OEM Carrier Transformer Replacement for Model FB4BNF042010AAAA Unit","description":"\u003cdiv\u003e\n\u003ch1\u003eOEM Carrier Transformer Replacement for Model FB4BNF042010AAAA Unit\u003c\/h1\u003e\n\u003cp\u003eThis OEM Carrier transformer is the exact-fit replacement low-voltage transformer for your FB4BNF042010AAAA fan coil unit. It converts incoming line voltage into the 24V control power that runs your thermostat, control board, and relay circuits — the signal every heating and cooling cycle depends on. A burned-out transformer is a frequent cause of a dead system, blown control fuses, or a thermostat with no power. Built to Carrier's original VA and voltage specifications, this transformer mounts in the factory location and wires in cleanly with no modifications. Installation is moderate and best left to a qualified technician: cut power, match the primary leads to line voltage and the secondary leads to the 24V circuit, then secure the unit. Confirm the VA rating matches your original before energizing. Genuine OEM parts deliver the correct, stable control voltage that off-brand units often can't guarantee. Bring your Carrier FB4BNF042010AAAA back online with confidence. In stock and ships same-day on orders before 3PM CST.\u003c\/p\u003e\n\u003ch2\u003eCompatibility\u003c\/h2\u003e\n\u003cp\u003eThis part is compatible with Carrier model FB4BNF042010AAAA.\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":62951342047603,"sku":"carrier-transformer-fb4bnf042010aaaa","price":54.95,"currency_code":"USD","in_stock":true}],"url":"https:\/\/nationalhvacparts.com\/products\/carrier-transformer-fb4bnf042010aaaa","provider":"National HVAC Parts","version":"1.0","type":"link"}