OEM Carrier Transformer 40VA 120V to 24V for Model FA4CNC024005AAAA

This is the factory OEM replacement transformer (part number HT01CN241) for the Carrier FA4CNC024005AAAA fan coil air handler. The transformer steps down line voltage from 120V to the 24V control circuit voltage required to power the thermostat, control board, contactor coil, and all low-voltage components. When this transformer fails, absolutely nothing in the control system will respond — the thermostat goes blank, relays won't energize, and the entire system appears dead. It is one of the first components to check during a no-power diagnostic.

• Specs: 40VA rated | 120V primary / 24V secondary | Factory OEM part number HT01CN241 | Direct plug-and-play replacement with original mounting footprint
• OEM vs Generic: The OEM HT01CN241 transformer is wound to exact VA and voltage tolerances required by Carrier's control board. Undersized or off-tolerance generic transformers can brown out the control circuit under peak load, causing intermittent lockouts and premature board failure.
• Install difficulty: 2/5 — Disconnect power at the breaker and verify zero voltage with a multimeter before touching any wiring. Tools needed: flathead and Phillips screwdrivers, multimeter, wire nuts or spade connectors. Photograph all low-voltage wiring connections before removal.
• Warranty: 1-year OEM factory warranty against defects. Orders placed by 3 PM ship same business day from our climate-controlled warehouse.

Compatibility: Designed specifically for the Carrier FA4CNC024005AAAA fan coil air handler. Always verify your unit's control circuit voltage and VA requirements on the data plate before ordering. If you need help confirming fitment, our HVAC parts specialists are available to verify compatibility before you buy — no guesswork required.