OEM Carrier 40VA Control Transformer for Model FV4ANF002000ADAA Air Handler

This is the factory OEM replacement transformer (part# HT01CN236) for the Carrier FV4ANF002000ADAA fan coil air handler. The transformer steps down 120V line voltage to 24V AC to power the low-voltage control circuit — including the thermostat, contactor coil, and control board. When the transformer fails, nothing in the control system responds: the thermostat goes dark, the system won't call for heating or cooling, and you may measure 0V at the R and C terminals on the board. It's one of the first components to check when an entire system appears completely dead.

• Specs: 40VA rating | Primary: 120V AC | Secondary: 24V AC | OEM part number HT01CN236 | Factory-matched for Carrier FV4ANF002000ADAA
• OEM vs Generic: This is the factory-original Carrier transformer, engineered to exact VA and voltage tolerances for your air handler's control board. Generic substitutes frequently run outside rated VA, causing premature failure of downstream components like contactors and control boards.
• Install difficulty: 2/5 — Shut off all power to the air handler at the breaker before beginning. Tools needed: flathead and Phillips screwdrivers, wire stripper, multimeter, needle-nose pliers. Label and photograph all low-voltage wiring before disconnecting. Verify 0V at the transformer primary before handling.
• Warranty: 1-year OEM factory warranty. In stock and ships same business day from our warehouse.

Compatibility: Engineered specifically for the Carrier FV4ANF002000ADAA fan coil air handler. 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 buy — same-day shipping available on all in-stock OEM parts.