OEM Carrier Control Transformer 40VA 208/230V to 24V for Model PF4MNB031L00ABAA

This OEM Carrier control transformer (part #HT01CN241) is the factory-specified replacement for the Carrier PF4MNB031L00ABAA fan coil unit. The transformer steps down the 208/230V line voltage to 24V AC, powering the entire low-voltage control circuit — including the thermostat, contactors, and control board. When this transformer fails, the system loses all 24V control signal: the thermostat goes dark, no calls for heating or cooling are processed, and the unit is completely unresponsive despite line power being present.

• Specs: 208/230V Primary | 24V Secondary | 40VA Capacity | OEM Part #HT01CN241 | Factory-matched to Carrier electrical tolerances
• OEM vs Generic: This OEM transformer is wound and rated to exact Carrier factory specifications, ensuring the correct VA headroom for all control loads on the PF4MNB031L00ABAA. Undersized or off-spec generic transformers frequently overheat, trip thermal protection, or fail prematurely under combined relay and board loads.
• Install difficulty: 2/5 — Always disconnect power at the breaker before servicing. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter (to verify 24V output after install). Photograph all low-voltage wiring before disconnecting. Replacement is straightforward — the transformer mounts to a chassis bracket with two screws and uses push-on or screw terminals.
• Warranty: 1-year OEM manufacturer warranty. In stock and ships same business day from our warehouse when ordered before cutoff.

Compatibility: Direct OEM replacement for Carrier model PF4MNB031L00ABAA fan coil units. Verify primary voltage tap on your unit's data plate (208V or 230V) before ordering — both taps are supported by this transformer. Questions about fitment? Our HVAC parts specialists verify compatibility before you order — contact us today.