OEM Carrier 40VA Control Transformer HT01CN241 for Model FB4CNF030T08ABAA

This OEM replacement transformer (part number HT01CN241) is the factory-specified control circuit transformer for the Carrier FB4CNF030T08ABAA fan coil air handler. The transformer steps line voltage (120V) down to 24V AC to power the low-voltage control circuit — including the thermostat, relay coils, and control board. When this transformer fails, the entire control circuit loses power: the thermostat goes blank, the system won't respond to any calls for heating or cooling, and no components will energize. It is often the first component to check when nothing in the system responds.

• Specs: 40VA rated | 120V primary / 24V secondary | OEM part number HT01CN241 | Factory-matched output voltage tolerance for stable low-voltage operation
• OEM vs Generic: This OEM transformer is wound to Carrier's exact VA rating and insulation class. Undersized or off-brand transformers can sag under load, causing nuisance lockouts, erratic thermostat behavior, and premature contactor coil failure.
• Install difficulty: 2/5 — Shut off power at the disconnect and verify with a multimeter before touching any wiring. Tools needed: flathead and Phillips screwdrivers, multimeter, wire nuts or spade connectors. Photograph all wiring connections before disconnecting the old unit.
• Warranty: 1-year OEM factory warranty against defects. In stock and ships same business day from our warehouse.

Compatibility: Designed for the Carrier FB4CNF030T08ABAA fan coil air handler. Always verify your existing transformer's VA rating and primary/secondary voltages on the unit data plate or wiring diagram before ordering. Need fitment confirmation? Our HVAC parts specialists verify compatibility before you buy — no guesswork required.