OEM Carrier Transformer 40VA 120V to 24V for Model FX4DNF031T08AAAA

This OEM replacement transformer (part number HT01CN241) is the factory-specified control circuit transformer for the Carrier FX4DNF031T08AAAA fan coil air handler. The transformer steps down 120V line voltage to the 24V signal voltage required to power the control board, thermostat circuit, and all low-voltage components. When this transformer fails, the entire control circuit goes dead — your thermostat will appear blank or unresponsive, and the system will not heat, cool, or circulate air regardless of thermostat settings. A blown transformer is often caused by a short in the low-voltage wiring or a faulty component drawing excess current; always inspect the secondary circuit before installing a replacement.

• Specs: 40VA rated | Primary: 120V AC | Secondary: 24V AC | Class 2 transformer | Direct OEM replacement for part number HT01CN241
• OEM vs Generic: This factory OEM unit is wound to exact VA and voltage specifications for the Carrier FX4DNF031T08AAAA. Generic transformers may underperform under full load, causing nuisance brownouts to the control board and intermittent system lockouts.
• Install difficulty: 2/5 — Shut off power at the breaker and air handler disconnect before starting. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, wire stripper, multimeter. Label all low-voltage wires before disconnecting. Test secondary output voltage after installation before closing the panel.
• Warranty: 1-year OEM factory warranty. In stock and ships same business day from our warehouse.

Compatibility: Designed for the Carrier FX4DNF031T08AAAA fan coil air handler. 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 prior to purchase — order with confidence and get back to comfort fast.