OEM Carrier Control Transformer 40VA for Model FA4BNC018005AAAA (HT01CN241)

This is the OEM factory-replacement control transformer for the Carrier FA4BNC018005AAAA air handler. The transformer steps down 120V line voltage to 24V AC to power the low-voltage control circuit — including the thermostat, contactor coil, and control board. When this transformer fails, the entire control circuit goes dead: the thermostat goes blank, the system stops responding to calls for heating or cooling, and no components energize. It is one of the first components to check when nothing in the system responds.

• Specs: 40VA rating | 120V primary / 24V secondary | OEM part number HT01CN241 | Factory-matched output voltage and VA capacity for Carrier FA4BNC018005AAAA
• OEM vs Generic: OEM transformers are wound to exact VA and voltage tolerances specified by Carrier engineering. Undersized or off-tolerance generic units can overload, trip the internal thermal fuse, and damage downstream control boards — making OEM the lower-risk choice on any critical control circuit component.
• Install difficulty: 2/5 — Shut off power at the disconnect and breaker before beginning. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter (to verify 24V output after install). Label or photograph all low-voltage wiring connections before disconnecting from the old transformer.
• Warranty: 1-year OEM factory warranty against defects. Orders placed before cutoff ship same business day from our climate-controlled parts warehouse.

Compatibility: Designed for the Carrier FA4BNC018005AAAA fan coil air handler. Always verify the VA rating and primary/secondary voltages on your unit's wiring diagram or data plate before ordering to confirm fit. Have your model and OEM part number HT01CN241 ready — our parts specialists are available to confirm fitment before you buy. In stock and ships today.