OEM Carrier Control Transformer 40VA 120V/24V for Model FV4ANF005000ADAA

This OEM Carrier transformer (part number HT01CN236) is the factory-specified replacement for the FV4ANF005000ADAA fan coil air handler. The transformer steps line voltage (120V) down to the 24V signal voltage required by the control board, thermostat, and all low-voltage control circuits. When this part fails, the entire control circuit loses power — your thermostat goes blank, the system won't respond to any commands, and nothing turns on. It is often the first component to suspect when the unit appears completely dead with no error codes.

• Specs: 40VA rating | 120V primary / 24V secondary | OEM part number HT01CN236 | Factory-matched output tolerance for reliable low-voltage control
• OEM vs Generic: The OEM transformer is wound and rated to exact factory specifications, ensuring proper VA capacity to power the control board, thermostat, and zone controls simultaneously. Undersized generic transformers can overheat and fail prematurely under full control circuit load.
• Install difficulty: 2/5 — Shut off all power to the unit before beginning. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, wire stripper, multimeter. Label or photograph all wiring connections before disconnecting. Mount securely and verify 24V output with a multimeter before restoring power.
• Warranty: 1-year OEM factory warranty. In-stock and ships same business day from our warehouse.

Compatibility: Designed for the Carrier FV4ANF005000ADAA fan coil air handler. Always verify your existing transformer's VA rating and primary/secondary voltages on the unit data plate before ordering. Our fitment team is available to confirm compatibility before you purchase — ships same business day.