OEM Carrier 40VA Control Transformer HT01CN241 for Model FB4CNF048L15ADAA

This OEM control transformer (part number HT01CN241) is the factory-specified replacement for the Carrier FB4CNF048L15ADAA fan coil air handler. The transformer steps down 120V line voltage to 24V AC, powering the entire low-voltage control circuit — including the thermostat, contactor coil, and control board. When this component fails, nothing in the system responds: the thermostat goes dark, the unit won't call for cooling or heating, and the control board receives no signal voltage. It is one of the first components to check when a system appears completely unresponsive despite power being present at the air handler.

• Specs: 40VA rating | 120V primary / 24V secondary | Class 2 transformer | Factory-wound for precise voltage output and thermal protection | Replaces OEM part number HT01CN241
• OEM vs Generic: This OEM transformer is factory-wound to exact VA and voltage tolerances required by the Carrier FB4CNF048L15ADAA control circuit. Generic aftermarket transformers frequently run low on secondary output voltage, causing intermittent lockouts, nuisance tripping, or premature control board failures.
• Install difficulty: 2/5 — Shut off all power at the breaker and disconnect switch before servicing. Tools needed: flathead and Phillips screwdrivers, wire stripper, multimeter to verify 24V output after installation. Label or photograph existing wire connections before removal.
• Warranty: 1-year OEM factory warranty against defects in materials and workmanship. In-stock and ships same business day from our warehouse.

Compatibility: Designed for the Carrier FB4CNF048L15ADAA fan coil air handler. Always verify your existing transformer's VA rating and primary/secondary voltages on the unit's data plate or wiring diagram before ordering. Our parts specialists are available to confirm fitment prior to purchase — order with confidence and get your system back online today.