{"product_id":"carrier-transformer-fb4cnf030t10acaa","title":"OEM Carrier Transformer for Model FB4CNF030T10ACAA Air Handler","description":"\u003cdiv\u003e\n\u003ch1\u003eOEM Carrier Transformer for Model FB4CNF030T10ACAA Air Handler\u003c\/h1\u003e\n\u003cp\u003eThis genuine OEM Carrier transformer is the correct factory control component for the FB4CNF030T10ACAA fan coil air handler. It converts incoming line voltage to the 24V control voltage that drives the thermostat, low-voltage relays, and contactor coil, allowing the system to respond to heating and cooling calls. A shorted or open transformer leaves the control side of the unit completely inactive, so it's a common culprit behind an unresponsive thermostat or a unit that simply won't start. Matched precisely to the original Carrier specification — VA rating, secondary leads, and mounting footprint — this replacement installs directly into the FB4CNF030T10ACAA with no adapters or rewiring. The swap is a moderate job: disconnect power, label and transfer the primary and secondary wiring, mount the transformer, reconnect, and meter the output to confirm 24V before powering up. Genuine OEM hardware safeguards the control board and keeps the equipment running to spec. In stock and shipping same-day on orders placed before 3PM CST.\u003c\/p\u003e\n\u003ch2\u003eCompatibility\u003c\/h2\u003e\n\u003cp\u003eThis part is compatible with Carrier model FB4CNF030T10ACAA.\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":62950595592563,"sku":"carrier-transformer-fb4cnf030t10acaa","price":49.95,"currency_code":"USD","in_stock":true}],"url":"https:\/\/nationalhvacparts.com\/products\/carrier-transformer-fb4cnf030t10acaa","provider":"National HVAC Parts","version":"1.0","type":"link"}