OEM Carrier Control Transformer 40VA 120V/24V for Model FY4ANF018005AAAA

This OEM replacement transformer (part number HT01CN241) is the factory-specified control circuit transformer for the Carrier FY4ANF018005AAAA air handler. It steps down 120V line voltage to 24V AC to power the control board, thermostat, and all low-voltage relay circuits throughout the system. When this transformer fails, the entire control circuit goes dead — your thermostat will go blank, the air handler won't respond to any calls for heating or cooling, and no error codes will display because the board itself has no power.

• Specs: 40VA rating | Primary: 120V AC | Secondary: 24V AC | OEM part number HT01CN241 | Factory-matched insulation class and core rating
• OEM vs Generic: OEM transformers are wound to exact VA and voltage tolerances required by the Carrier FY4ANF018005AAAA control board. Undersized or off-tolerance generic units can overheat, trip internal fuses, or damage the control board they're meant to protect.
• Install difficulty: 2/5 — Disconnect power at the breaker before beginning. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter (to verify 24V output after install). Photograph all wire connections before disconnecting. Terminals are typically push-in or screw-type for straightforward swap.
• Warranty: 1-year OEM factory warranty. In stock and ships same business day from our warehouse.

Compatibility: Designed specifically for the Carrier FY4ANF018005AAAA air handler. Verify your existing transformer's VA rating and primary/secondary voltages on its label before ordering to confirm fitment. If your system's control circuit is completely unresponsive and you've already ruled out a blown fuse or tripped breaker, this transformer is the next diagnostic step. Order today and our team is available to verify fitment before you buy.