OEM Carrier Control Transformer 40VA 120V/24V for Model FX4CNF030008AAAA

This OEM replacement transformer (part number HT01CN241) is the factory-specified control circuit transformer for the Carrier FX4CNF030008AAAA fan coil air handler. The transformer steps down line voltage from 120V to 24V AC, powering the low-voltage control circuit that connects the thermostat, control board, contactor coil, and all safety switches. When it fails — whether from a wiring short, voltage spike, or age — nothing in your system responds: the thermostat goes blank, the air handler won't start, and the entire control circuit goes dead.

• Specs: 40VA rating | Primary: 120V AC | Secondary: 24V AC | OEM part number HT01CN241 | Factory-matched to Carrier FX4CNF030008AAAA wiring harness and mounting configuration
• OEM vs Generic: The OEM HT01CN241 transformer is wound to exact VA and voltage tolerances Carrier specifies. Undersized generic transformers can overheat, blow their internal fuse, or cause erratic low-voltage behavior that leads to misdiagnosed control board failures.
• Install Difficulty: 2/5 — Shut off all power at the disconnect and breaker before starting. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter (verify 0V before touching terminals). Label all 24V control wires before disconnecting. Reconnect line-voltage wires last and confirm polarity.
• Warranty: 1-year OEM factory warranty against defects. In stock and ships same business day from our climate-controlled warehouse.

Compatibility: Engineered as a direct OEM replacement for the Carrier FX4CNF030008AAAA fan coil air handler. Always verify the transformer VA rating and primary/secondary voltages on your unit's data plate before ordering. If your system runs a heat pump or two-stage thermostat, confirm your control circuit load does not exceed 40VA. Our fitment team is available to verify compatibility before you order — same-day shipping on all in-stock parts.