OEM Carrier 40VA Control Transformer HT01CN241 for Model FX4DNF049T10ABAA

This OEM control transformer (part# HT01CN241) is the factory-specified replacement for the Carrier FX4DNF049T10ABAA air handler. The transformer steps down 120V line voltage to the 24V signal voltage that powers your thermostat, control board, and all low-voltage control circuits. When this transformer fails, the entire control system goes dark — the thermostat loses power, the system won't respond to any call for heating or cooling, and nothing works. It is often the first component to diagnose when you have zero control-circuit response despite the unit receiving line voltage.

• Specs: 40VA rating | Primary: 120V AC | Secondary: 24V AC | Direct OEM replacement | Factory-matched output for reliable low-voltage control circuit operation
• OEM vs Generic: OEM transformers from Carrier are wound and insulated to exact VA and voltage tolerances, reducing the risk of nuisance trips, overheating, or downstream control board damage that undersized or off-spec generic units can cause.
• Install Difficulty: 2/5 — Disconnect all power before beginning. Tools needed: Phillips and flathead screwdrivers, needle-nose pliers, multimeter (to verify 24V output after install). Label or photograph all low-voltage wiring connections before removing the old unit.
• Warranty: 1-year OEM factory warranty against defects. In stock and ships same business day from our warehouse.

Compatibility: Engineered specifically for the Carrier FX4DNF049T10ABAA multi-position air handler. Always verify your existing transformer's VA rating and primary/secondary voltages against your unit's data plate before ordering. Our HVAC parts specialists are available to confirm fitment prior to purchase — order with confidence and get your system back online today.