OEM Carrier Transformer 40VA 120V–24V for Model FA4CNF024010AAAA

This is the factory OEM replacement transformer (part number HT01CN241) for the Carrier FA4CNF024010AAAA air handler. The transformer steps down line voltage from 120V to the 24V AC signal that powers your control board, thermostat, and all low-voltage control circuits. When the transformer fails, the entire control circuit loses power — resulting in a completely unresponsive thermostat, a blank display, or a system that refuses to call for heating or cooling despite a functioning power supply.

• Specs: 40VA rating | 120V primary / 24V secondary | OEM part number HT01CN241 | Direct plug-and-play replacement with factory-matched mounting footprint and wire leads
• OEM vs Generic: This OEM transformer is wound to Carrier's exact VA and voltage tolerances, ensuring stable 24V output under full control-circuit load. Undersized or off-tolerance generic units can cause erratic thermostat behavior, nuisance lockouts, and premature control board failure.
• Install difficulty: 2/5 — Disconnect power at the breaker before beginning. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter (to verify 24V output after install). Note wire lead colors or photograph connections before removing the old transformer.
• Warranty: 1-year OEM factory warranty against defects. In stock and ships same business day from our warehouse.

Compatibility: Designed specifically for the Carrier FA4CNF024010AAAA fan coil air handler. Always verify your existing transformer's VA rating and primary/secondary voltages on the unit data plate before ordering to confirm fitment. Have questions about compatibility? Our HVAC parts specialists verify fitment before you buy — reach out before placing your order.