OEM Carrier Control Transformer 208/230V–24V 40VA for Model PF4MNA031T00AAAA

This OEM Carrier transformer (part #HT01CN241) is the factory-specified 40VA step-down transformer for the Carrier PF4MNA031T00AAAA fan coil and air handler series. The transformer converts 208/230V line voltage down to the 24V AC signal that powers the entire low-voltage control circuit — including the thermostat, contactor coil, and control board. When this part fails, the result is typically a completely unresponsive system: the thermostat goes blank, the unit ignores all calls for heating or cooling, or a fuse on the control board blows repeatedly. Replacing the transformer is one of the most definitive repairs in HVAC service.

• Specs: 208/230V primary | 24V secondary | 40VA rated | OEM part number HT01CN241 | Factory-matched to Carrier PF4MNA031T00AAAA specifications
• OEM vs Generic: OEM transformers are wound and tested to exact Carrier factory tolerances, ensuring stable 24V output under full load. Generic units may sag under load, causing intermittent lockouts, nuisance tripped fuses, or premature control board failure.
• Install difficulty: 2/5 — Shut off power at the disconnect and breaker before beginning. Tools needed: multimeter (verify 0V before touching terminals), flathead and Phillips screwdrivers, wire stripper, needle-nose pliers. Label all low-voltage wires before disconnecting. Confirm fuse integrity on the control board before energizing.
• Warranty: 1-year OEM manufacturer warranty. In-stock units ship same business day from our warehouse when ordered by 3 PM local time.

Compatibility: Engineered as a direct OEM replacement for Carrier model PF4MNA031T00AAAA fan coil units. Also used across Carrier, Bryant, and ICP-family air handlers sharing the HT01CN241 specification. Always verify primary voltage (208V or 230V) and VA rating on your unit's data plate before ordering. Our fitment team is available to confirm compatibility — contact us before you order.