OEM Carrier 40VA Control Transformer 208/230V–24V for Model PF4MNB025T00ABAA

This OEM Carrier transformer (part #HT01CN241) is the factory-specified 40VA step-down transformer for the Carrier PF4MNB025T00ABAA fan coil and air handler. The transformer converts 208/230V line voltage down to the 24V AC used by the entire control circuit — including the thermostat, contactor coil, and control board. When the transformer fails, the result is complete control loss: the thermostat goes dark, the system won't respond to any call for heating or cooling, and in some cases a tripped or blown fuse on the secondary side is the first clue. Replacing with a genuine OEM unit is the fastest path back to normal operation.

• Specs: 40VA rating | 208/230V primary | 24V AC secondary | Direct OEM replacement for part #HT01CN241 | Class 2 control transformer
• OEM vs Generic: Genuine Carrier OEM transformers are wound to exact VA and voltage tolerances. Undersized or off-spec generic transformers overheat under normal HVAC control loads, blowing secondary fuses and shortening the life of connected boards and relays.
• Install difficulty: 2/5 — Shut off all power at the breaker before beginning. Tools needed: flathead and Phillips screwdrivers, wire stripper, multimeter. Verify 24V output on the secondary after installation before closing the panel. Photograph all wiring connections before disconnecting.
• Warranty: 1-year OEM manufacturer warranty. In stock — ships same business day from our warehouse.

Compatibility: Factory-matched replacement for Carrier model PF4MNB025T00ABAA fan coil units and compatible air handlers. Always verify your unit's data plate voltage requirements match 208/230V primary before ordering. Our team is available to confirm fitment — reach out before you order if unsure.