OEM Carrier Transformer 40VA 120V/24V for Model FB4CNF024L10ACAA

This OEM transformer (part number HT01CN241) is the factory-specified replacement for the Carrier FB4CNF024L10ACAA fan coil air handler. The transformer steps down incoming 120V line voltage to the 24V signal required by your thermostat, control board, and all low-voltage control circuit components. When this part fails, nothing in your system responds — the thermostat goes blank, the air handler won't start, and the entire control circuit goes dead. It is often the first component to inspect when a system shows zero response despite power being present at the unit.

• Specs: 40VA rating | Primary: 120V | Secondary: 24V | Factory OEM part number HT01CN241 | Replaces worn or shorted transformers with exact-fit mounting and wiring terminals
• OEM vs Generic: OEM transformers are wound and rated to exact factory VA tolerances, protecting downstream control boards and thermostats. Generic units may run under-rated VA, causing overheating and premature control board failure.
• Install difficulty: 2/5 — Disconnect power at the breaker before beginning. Tools needed: flathead and Phillips screwdrivers, multimeter, wire nuts or spade terminals. Verify primary voltage is 120V at the unit before condemning the transformer. Label all low-voltage wiring before disconnecting.
• Warranty: 1-year OEM factory warranty. In stock and ships same business day from our warehouse.

Compatibility: Designed for the Carrier FB4CNF024L10ACAA fan coil air handler. Verify your existing transformer's VA rating and primary/secondary voltages on the unit's data plate before ordering. Not sure it fits? Our HVAC parts specialists confirm fitment before you buy — no guesswork required.