OEM Carrier 40VA Control Transformer for Model FB4CNF030010ACAA

This OEM replacement transformer (part# HT01CN241) is the factory-specified control circuit transformer for the Carrier FB4CNF030010ACAA fan coil unit. The transformer steps down 120V line voltage to the 24V AC signal that powers your thermostat, control board, and all low-voltage safety circuits. When this component fails, the entire control circuit loses power — your thermostat goes blank, the system won't respond to any calls for heating or cooling, and no fault codes are generated because the board itself has no power to operate.

• Specs: 40VA rating | 120V primary / 24V secondary | Compatible with standard 24V thermostat wiring | Factory-matched output tolerances for reliable control circuit operation
• OEM vs Generic: The OEM HT01CN241 transformer is wound to Carrier's exact VA and voltage specifications. Undersized or off-tolerance generic transformers can overheat under normal control circuit loads, blow fuses repeatedly, or cause erratic thermostat behavior — costing more in callbacks than the part itself.
• Install difficulty: 2/5 — Shut off all power to the unit before beginning. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter (to verify 24V output after install). Label or photograph existing low-voltage wiring connections before disconnecting the old transformer.
• Warranty: 1-year OEM factory warranty against defects. In stock and ships same business day from our warehouse.

Compatibility: Designed as the direct OEM replacement for Carrier FB4CNF030010ACAA fan coil units. Always verify your unit's data plate voltage and VA rating before ordering. If you're unsure of fitment, our parts specialists can confirm compatibility before you purchase — same-day shipping on all in-stock orders.