OEM Carrier Transformer 40VA 120V/24V for Model FB4CNF030L08ACAA

This is the factory OEM replacement transformer (part number HT01CN241) for the Carrier FB4CNF030L08ACAA fan coil air handler. The transformer steps down line voltage from 120V to 24V to power the low-voltage control circuit — including the thermostat, contactor coil, and control board. When the transformer fails, the entire control system goes dark: the thermostat becomes unresponsive, the system won't call for cooling or heating, and a multimeter will show 0V on the 24V secondary terminals.

• Specs: 40VA capacity | 120V primary / 24V secondary | OEM part number HT01CN241 | Factory-matched output tolerances for stable control-circuit operation
• OEM vs Generic: OEM transformers maintain tight voltage regulation under varying load conditions. Generic units can drift outside the 24V ±10% window, causing erratic thermostat behavior and nuisance tripping of the control board's fuse.
• Install difficulty: 2/5 — Disconnect power at the breaker before beginning. Tools needed: flathead and Phillips screwdrivers, wire stripper, multimeter, wire nuts. Photograph all wiring connections before removing the old unit. Confirm 24V output before closing the panel.
• Warranty: 1-year OEM factory warranty. Ships same business day from our warehouse when ordered before 3PM local time.

Compatibility: Designed specifically for the Carrier FB4CNF030L08ACAA fan coil air handler. Always verify your existing transformer's VA rating and primary/secondary voltages on the unit's data plate before ordering. Our HVAC parts specialists are available to confirm fitment — contact us before you order if you have any questions.