OEM Carrier 40VA Control Transformer 208/230V–24V for Model PF1MNB024005AAAA

The Carrier HT01CN241 is the factory-specified OEM control transformer for the PF1MNB024005AAAA fan coil and air handler unit. This transformer steps down 208/230V line voltage to a safe 24V AC output, powering the entire low-voltage control circuit — including the thermostat, contactor coil, and control board. When this part fails, the result is total control loss: the thermostat goes dark, the system won't respond to calls for heating or cooling, and no low-voltage components will operate. It is one of the first parts to check when a system shows zero response despite confirmed line voltage at the unit.

• Specs: 208/230V primary | 24V secondary | 40VA power rating | Direct OEM drop-in replacement | Part number HT01CN241
• OEM vs Generic: OEM transformers are wound to exact VA and impedance tolerances required by Carrier. Undersized or off-spec generic transformers can blow onboard fuses, trip thermal cutoffs, or cause erratic control board behavior — costing far more in callbacks than the price difference.
• Install difficulty: 2/5 — Disconnect power at the breaker before beginning. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter (verify 0V before touching terminals). Note wire colors and terminal labels before removal. Replacement typically takes 20–30 minutes.
• Warranty: 1-year OEM manufacturer warranty. In-stock orders ship same business day from our warehouse.

Compatibility: This is the direct OEM replacement transformer for the Carrier PF1MNB024005AAAA. Always verify your existing transformer's primary voltage, secondary voltage, and VA rating on its label before ordering. Our fitment team is available to confirm compatibility before you purchase — no guesswork required.