OEM Carrier Control Transformer 40VA 120V to 24V for Model FX4DNB061T00AAAA

This is the factory OEM replacement transformer (part number HT01CN241) for the Carrier FX4DNB061T00AAAA fan coil air handler. The transformer steps down 120V line voltage to the 24V AC signal that powers your thermostat, control board, and all low-voltage switching circuits. When the transformer fails, the entire control circuit goes dead — your thermostat goes blank, the system won't respond to any calls for heating or cooling, and no fault codes will display. Replacing a failed transformer is often the fastest and most affordable fix for a completely unresponsive HVAC system.

• Specs: 40VA rated | Primary: 120V AC | Secondary: 24V AC | OEM part number HT01CN241 | Factory-matched for Carrier FX4DNB061T00AAAA air handler
• OEM vs Generic: OEM transformers are wound to exact VA and voltage tolerances required by Carrier's control board. Undersized or off-tolerance generic units can overheat, trip the internal fuse repeatedly, or fail to supply adequate current to multi-zone or communicating thermostats.
• Install difficulty: 2/5 — Disconnect power at the breaker before starting. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter to confirm 24V output after install. Label or photograph all low-voltage wiring before disconnecting terminals.
• Warranty: 1-year OEM factory warranty against defects in materials and workmanship. In-stock and ships same business day from our warehouse.

Compatibility: Designed specifically for the Carrier FX4DNB061T00AAAA fan coil air handler. Always verify your existing transformer's VA rating and primary/secondary voltages on the unit data plate or wiring diagram before ordering. If you're unsure about fitment, our parts team is available to verify compatibility before you buy — same-day shipping available on all in-stock orders.