OEM Carrier 40VA Control Transformer HT01CN241 for Model FX4DNB061T00ABAA

This OEM replacement transformer (part number HT01CN241) is the factory-specified control circuit transformer for the Carrier FX4DNB061T00ABAA air handler. Its job is to step down 120V line voltage to the 24V AC signal that powers your thermostat, control board, and all low-voltage switching components. When it fails — often due to a shorted control wire, a tripped internal fuse, or overloading — the entire low-voltage control circuit goes dead. Symptoms include a completely unresponsive thermostat, a blank display, and a system that won't call for heating or cooling at all despite power being present at the unit.

• Specs: 40VA rating | 120V primary / 24V secondary | OEM part number HT01CN241 | Factory-matched output voltage tolerance for reliable low-voltage control
• OEM vs Generic: This OEM transformer is wound and rated to Carrier's exact VA specification. Undersized or off-tolerance generic transformers can overheat under full load, tripping repeatedly or failing early — especially when multiple zone valves or accessories share the same 24V circuit.
• Install difficulty: 2/5 — Shut off power at the disconnect and breaker before beginning. Tools needed: flathead and Phillips screwdrivers, wire stripper, multimeter (to verify 24V output after install). Label all low-voltage wires before disconnecting. Confirm the cause of failure (e.g., shorted thermostat wire) before energizing the new transformer.
• Warranty: 1-year OEM factory warranty. In stock and ships same business day from our warehouse.

Compatibility: Engineered as a direct OEM replacement for the Carrier FX4DNB061T00ABAA air handler. Always verify your existing transformer's VA rating and primary/secondary voltages against your unit's data plate before ordering. Our parts specialists are available to confirm fitment — order with confidence and get your system back online fast.