OEM Carrier 40VA Control Transformer 120V–24V for Model PF1MNC025000AAAA

This is the factory OEM replacement transformer (part number HT01CN241) for the Carrier PF1MNC025000AAAA fan coil unit. The transformer steps down line voltage (120V) to the 24V AC signal that powers the entire low-voltage control circuit — including the thermostat, control board, relays, and zone controllers. When this transformer fails, nothing in the control system receives power: the thermostat goes blank, the system won't respond to calls for heating or cooling, and the unit is completely inoperable. It is often the first component to check when you have zero control-circuit response.

• Specs: 120V primary | 24V secondary | 40VA rated | Class 2 output | Direct OEM replacement for part number HT01CN241
• OEM vs Generic: The OEM HT01CN241 transformer is wound and insulated to Carrier's exact VA rating and thermal specs. Generic alternatives may run under-rated VA, causing overheating, nuisance trips, and premature failure of downstream control boards.
• Install difficulty: 2/5 — Shut off power at the disconnect and breaker before beginning. Tools needed: flathead and Phillips screwdriver, multimeter (to confirm 24V output after installation), wire nuts or terminal connectors. Label all low-voltage wires before disconnecting.
• Warranty: 1-year OEM factory warranty against defects. In stock and ships the same business day from our warehouse.

Compatibility: Designed for the Carrier PF1MNC025000AAAA fan coil unit. Confirm your unit's transformer primary/secondary voltage and VA rating on the data plate before ordering. Not sure it fits? Our HVAC parts specialists verify fitment before you order — contact us today. In stock — ships today.