OEM Carrier Transformer 40VA 120V to 24V for Model FB4CNF036L10AEAA

This is the factory OEM replacement transformer (part# HT01CN241) designed specifically for the Carrier FB4CNF036L10AEAA fan coil air handler. The transformer steps down line voltage from 120V AC to 24V AC to power the low-voltage control circuit — including the thermostat, control board, and zone controls. When the transformer fails, the entire control circuit loses power: your thermostat goes blank, the system stops responding entirely, and no heating or cooling is delivered regardless of settings. A failed transformer is often mistaken for a bad control board or thermostat, making correct diagnosis critical before replacing more expensive components.

• Specs: 40VA rating | 120V primary / 24V secondary | OEM part number HT01CN241 | Factory-matched output for Carrier control circuits
• OEM vs Generic: This OEM unit is wound to exact Carrier voltage and VA specifications. Generic transformers frequently deliver slightly off-spec voltage that can cause nuisance lockouts, erratic thermostat behavior, or premature control board failure — costing far more in follow-up repairs.
• Install Difficulty: 2/5 — Shut off all power to the air handler at the breaker before beginning. Tools needed: flathead and Phillips screwdrivers, multimeter (to confirm 0V before touching wiring), wire nuts or spade connectors. Photograph existing wiring connections before removal. Most technicians complete this replacement in under 30 minutes.
• Warranty: 1-year OEM factory warranty against defects. In-stock and ships same business day from our warehouse.

Compatibility: Engineered for the Carrier FB4CNF036L10AEAA fan coil air handler. Always verify your unit's data plate confirms 40VA transformer rating before ordering. If you're unsure of fitment, our parts team is available to verify compatibility before you buy — ensuring you get the right part the first time.