OEM Carrier 40VA Control Transformer HT01CN241 for Model FX4DNF031008AAAA

This OEM replacement transformer (part number HT01CN241) is the factory-specified control circuit transformer for the Carrier FX4DNF031008AAAA fan coil air handler. The transformer steps down 120V line voltage to 24V AC, powering the thermostat, contactor coil, and all low-voltage control signals throughout the system. When this transformer fails, the entire control circuit goes dead — your thermostat goes blank, the system won't respond to any call for heating or cooling, and nothing operates. It is often the first component to check when a system appears completely unresponsive despite line voltage being present.

• Specs: 40VA rating | 120V primary / 24V secondary | OEM part number HT01CN241 | Factory-matched output tolerance for reliable low-voltage control
• OEM vs Generic: This is the genuine OEM Carrier transformer, manufactured to exact factory specifications. Generic transformers often underrate their true VA capacity, causing premature thermal cutout trips and nuisance lockouts under normal system load.
• Install difficulty: 2/5 — Disconnect all power before servicing. Tools needed: flathead and Phillips screwdrivers, wire stripper, multimeter to confirm 24V output after installation. Label or photograph all low-voltage wiring before disconnecting from secondary terminals.
• Warranty: 1-year OEM factory warranty against defects. Orders placed by 3PM local time ship same business day from our climate-controlled parts warehouse.

Compatibility: Designed for the Carrier FX4DNF031008AAAA fan coil air handler. Always verify the transformer's VA rating and primary/secondary voltage on your unit's data plate before ordering to ensure correct fitment. Have questions about compatibility? Our HVAC parts specialists confirm fitment before you buy — no guesswork.