OEM Carrier Transformer 40VA 120V/24V for Model FC4DNF024010AAAA

This OEM replacement transformer (part number HT01CN241) is the factory-specified control circuit transformer for the Carrier FC4DNF024010AAAA fan coil unit. The transformer steps down 120V line voltage to 24V, powering the control board, thermostat, and all low-voltage switching circuits throughout the system. When this component fails, the entire control circuit goes dark — the thermostat becomes unresponsive, the system will not call for heating or cooling, and nothing operates despite line voltage being present at the unit.

• Specs: 40VA rating | Primary voltage: 120V | Secondary voltage: 24V | OEM part number HT01CN241 | Factory-matched output for full control circuit compatibility
• OEM vs Generic: This is a genuine OEM Carrier transformer wound to exact VA and voltage tolerances. Generic transformers often run under-rated VA, causing thermal overloads, nuisance tripping, and premature control board failure — avoid the shortcut on this critical component.
• Install difficulty: 2/5 — Disconnect all power before servicing. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter. Confirm 0V at primary terminals before handling. Photograph existing wiring connections before removal. Reconnect secondary leads to matching terminals on the control board.
• Warranty: 1-year OEM factory warranty against defects in materials and workmanship. In-stock and ships same business day from our warehouse.

Compatibility: Designed and factory-matched for the Carrier FC4DNF024010AAAA fan coil unit. Always verify your existing transformer's VA rating, primary voltage, and secondary voltage against your unit's data plate before ordering to confirm fitment. Have a question about compatibility? Our HVAC parts specialists verify fitment before you buy — reach out before placing your order.