OEM Carrier Transformer 40VA 120V to 24V for Model FB4CNF024L00ACAA

This is the factory OEM replacement transformer (part number HT01CN241) for the Carrier FB4CNF024L00ACAA fan coil air handler. The transformer steps down 120V line voltage to the 24V AC signal that powers your entire control circuit — including the thermostat, contactor coil, and control board. When the transformer fails, the result is total system silence: the thermostat goes blank, the air handler won't respond to any call for cooling or heating, and nothing in the low-voltage circuit operates. It is one of the most overlooked but critical components in any air handler.

• Specs: 40VA rated | Primary: 120V AC | Secondary: 24V AC | Factory-matched for Carrier FB4CNF024L00ACAA | OEM part number HT01CN241
• OEM vs Generic: The OEM transformer is wound and tested to Carrier's exact VA and voltage tolerances. Undersized or off-spec generic transformers can overheat, trip the built-in fuse, or deliver marginal 24V output that causes erratic thermostat and board behavior.
• Install difficulty: 2/5 — Disconnect power at the breaker before beginning. Tools needed: flathead and Phillips screwdrivers, wire stripper, multimeter. Verify 24V output at secondary terminals before buttoning up the panel. Label or photograph all low-voltage wiring before disconnecting the old unit.
• Warranty: 1-year OEM factory warranty. In stock and ships same business day from our warehouse.

Compatibility: Designed and tested for the Carrier FB4CNF024L00ACAA fan coil air handler. Always confirm your unit's existing transformer VA rating and primary/secondary voltages on the data plate before ordering. Our fitment team is available to verify compatibility before you purchase — order with confidence and get your system back online today.