OEM Carrier 40VA Control Transformer HT01CN241 for Model FB4CNF018L08ACAA

This OEM step-down transformer (part # HT01CN241) is the factory-specified replacement for the Carrier FB4CNF018L08ACAA fan coil air handler. The transformer converts 120V line voltage to the 24V AC signal that powers the entire low-voltage control circuit — including the thermostat, contactor coil, and control board. When this component fails, the system goes completely silent: the thermostat goes blank, nothing responds to a call for cooling or heating, and the unit will not operate at all. A blown fuse on the control board is often the first clue that the transformer has failed due to a short or overload.

• Specs: Input 120V AC | Output 24V AC | 40VA rated | OEM part number HT01CN241 | Factory-matched to Carrier air handler electrical specifications
• OEM vs Generic: The OEM HT01CN241 transformer is wound to exact VA and voltage tolerances required by the Carrier FB4CNF018L08ACAA control board. Generic transformers often fall short on VA capacity, causing overheating, nuisance tripped fuses, and premature failure of downstream control components.
• Install difficulty: 2/5 — Disconnect power at the breaker before beginning. Tools needed: flat-head and Phillips screwdrivers, wire stripper, multimeter. Label or photograph all low-voltage wiring before removing the old unit. Confirm output voltage with a multimeter before re-energizing the full system.
• Warranty: 1-year OEM factory warranty. In stock and ships same business day from our warehouse.

Compatibility: Designed and factory-matched for the Carrier FB4CNF018L08ACAA fan coil air handler. Always verify your existing transformer's input/output voltage and VA rating against the data plate inside the unit before ordering. Our fitment team is available to confirm compatibility before you buy — order with confidence and get back to comfort fast.