OEM Carrier 40VA Control Transformer HT01CN241 for Model FY5BNF048L00AAAA

This is the factory OEM replacement transformer (part number HT01CN241) for the Carrier FY5BNF048L00AAAA packaged unit. The transformer steps down 120V line voltage to the 24V AC signal that powers your thermostat, control board, contactor coil, and every other low-voltage component in the system. When the transformer fails — due to a shorted control wire, overloaded secondary circuit, or simple age — absolutely nothing works: the thermostat goes dark, the unit will not respond to any call for heating or cooling, and no safety controls can operate. It is almost always the first component to inspect when the entire control circuit goes dead.

• Specs: 40VA rating | Primary: 120V AC | Secondary: 24V AC | OEM part number HT01CN241 | Factory-matched output for Carrier low-voltage control circuits
• OEM vs Generic: The OEM HT01CN241 transformer is wound to exact VA and voltage tolerances required by Carrier's control board. Undersized or off-tolerance generic transformers can sag under load, causing intermittent lockouts and premature control board failure.
• Install difficulty: 2/5 — Shut off all power at the disconnect and breaker before beginning. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter. Label all wires before disconnecting. Verify 24V output with a multimeter after installation before restoring full power.
• Warranty: 1-year OEM factory warranty against defects. In-stock units ship same business day from our warehouse.

Compatibility: Designed as the direct OEM replacement transformer for the Carrier FY5BNF048L00AAAA packaged unit. Always verify your existing transformer's VA rating and primary/secondary voltages against your unit's data plate before ordering. Have your model and serial number ready — our parts team is available to confirm fitment before you buy. Order today and your part ships the same business day.