OEM Carrier 40VA Control Transformer HT01CN241 for Model FC4DNF024000AAAA

This OEM replacement transformer (part number HT01CN241) is the factory-specified control circuit transformer for the Carrier FC4DNF024000AAAA fan coil unit. The transformer steps down 120V line voltage to the 24V signal voltage that powers your thermostat, control board, and all low-voltage control circuits. When this component fails, the entire control system loses power — resulting in a blank thermostat display, an unresponsive system, or a tripped secondary fuse with no obvious cause. If your Carrier fan coil appears completely dead despite confirmed line voltage at the unit, this transformer is one of the first components to test.

• Specs: 40VA rating | Primary: 120V AC | Secondary: 24V AC | OEM part number HT01CN241 | Factory-matched output for stable low-voltage control circuit performance
• OEM vs Generic: This OEM unit is wound to exact Carrier factory tolerances, ensuring proper VA capacity and voltage regulation. Undersized or off-tolerance generic transformers can cause nuisance fuse trips, erratic thermostat behavior, and premature control board failure — making OEM the only safe choice for this application.
• Install difficulty: 2/5 — Disconnect all power to the unit before beginning. Tools needed: flathead and Phillips screwdriver, multimeter, wire stripper. Label or photograph all low-voltage wiring before disconnecting. Verify secondary output reads 24–28V AC with a multimeter before closing up the panel.
• Warranty: 1-year OEM factory warranty against defects. In-stock and ships same business day from our climate-controlled warehouse.

Compatibility: Designed for the Carrier FC4DNF024000AAAA fan coil unit. Always confirm your existing transformer's VA rating and primary/secondary voltages on the unit data plate before ordering. Our HVAC parts specialists are available to verify fitment — order with confidence and get back to comfort fast.