OEM Carrier 40VA Control Transformer HT01CN241 for Model FX4CNB048T00AAAA

This OEM replacement transformer (part number HT01CN241) is the factory-specified step-down transformer for the Carrier FX4CNB048T00AAAA fan coil air handler. The transformer steps incoming 120V line voltage down to 24V AC to power the entire low-voltage control circuit — including the thermostat, contactor coil, and control board. When this component fails, the system goes completely silent: no fan, no cooling, no response from the thermostat. A blown fuse on the control board or a burning smell near the air handler are common indicators that the transformer has shorted or overloaded.

• Specs: 40VA rated | 120V primary / 24V secondary | Class 2 transformer | Factory-matched impedance for reliable low-voltage control
• OEM vs Generic: This OEM unit meets Carrier's exact VA rating and insulation class. Undersized or off-brand transformers can overheat under normal load, tripping thermal protection and causing intermittent lockouts — OEM eliminates that risk.
• Install Difficulty: 2/5 — Disconnect power at the breaker and verify voltage is absent before beginning. Tools needed: flathead and Phillips screwdrivers, wire nuts or spade terminals, multimeter. Label all wiring connections before removal to simplify reinstallation.
• Warranty: 1-year OEM factory warranty. In stock and ships same business day from our warehouse.

Compatibility: Designed as a direct OEM replacement for the Carrier FX4CNB048T00AAAA 4-ton fan coil air handler. Always verify your existing transformer's VA rating and primary/secondary voltage on the unit's data plate or wiring diagram before ordering. Our fitment team is available to confirm compatibility before you buy — same-day shipping on all in-stock OEM parts.