OEM Carrier 40VA Control Transformer 208/230V–24V for Model PF4MNA043L00ABAA

This OEM Carrier control transformer (part #HT01CN241) is the factory-specified replacement for the Carrier PF4MNA043L00ABAA air handler. The transformer steps down line voltage from 208/230V to 24V AC to power the low-voltage control circuit — including the thermostat, contactor coil, and control board. When this transformer fails, the entire control circuit goes dead: the system will not respond to the thermostat, relays won't energize, and the unit will not operate at all. A failed transformer is often confirmed by measuring 0V AC on the 24V secondary while line voltage is present at the primary.

• Specs: 208/230V Primary | 24V Secondary | 40VA output rating | Factory OEM part #HT01CN241 | Direct drop-in replacement
• OEM vs Generic: This is a genuine Carrier Factory Authorized Part engineered to exact transformer specifications. Generic 40VA transformers vary in VA capacity and insulation class, risking nuisance trips or premature burnout under full control-circuit load.
• Install difficulty: 2/5 — Disconnect power at the breaker before starting. Tools needed: multimeter, flathead and Phillips screwdrivers, wire nuts or spade connectors. Photograph and label all low-voltage wiring before disconnecting. Verify 0V at both primary terminals before handling.
• Warranty: 1-year OEM manufacturer warranty. In-stock units ship same business day from our warehouse.

Compatibility: Engineered for the Carrier PF4MNA043L00ABAA air handler. Verify your unit's data plate shows 208/230V primary input and a 40VA control transformer before ordering. Our fitment team is available to confirm compatibility before you buy — order with confidence and get back to comfort fast.