OEM Carrier 40VA Control Transformer 208/230V–24V for Model PF4MNB043000AAAA

This OEM Carrier transformer (part #HT01CN241) is the factory-specified 40VA control transformer for the Carrier PF4MNB043000AAAA fan coil and air handler unit. The transformer steps down line voltage from 208/230V on the primary side to a safe 24V AC on the secondary side, powering the entire low-voltage control circuit — including the thermostat, contactor coil, and control board. When this transformer fails, the entire control system goes dark: the thermostat goes blank, the system won't respond to calls for heating or cooling, and nothing turns on. Replacing it is one of the quickest ways to restore full system operation.

• Specs: 208/230V primary | 24V secondary | 40VA power rating | OEM part #HT01CN241 | Direct factory replacement
• OEM vs Generic: This is a genuine OEM Carrier transformer built to exact factory voltage and VA specifications. Generic transformers may be rated at ±10% tolerance, risking under-voltage to the control board or contactor coil and shortening component life.
• Install difficulty: 2/5 — Shut off power at the disconnect and breaker before starting. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter. Label all 24V secondary wires before disconnecting. Verify primary voltage (208V vs. 230V) on the unit data plate before ordering.
• Warranty: 1-year OEM manufacturer warranty. In stock and ships same business day from our warehouse.

Compatibility: Factory-matched replacement for the Carrier PF4MNB043000AAAA fan coil/air handler. Verify your unit's primary voltage and VA requirement on the data plate before ordering. Need help confirming fitment? Our HVAC parts specialists verify compatibility before you buy — order today and receive fast, same-day shipping.