OEM Carrier Transformer 40VA 120V to 24V for Model FY5BNF024000AAAA

This OEM replacement transformer (part number HT01CN241) is the factory-specified control circuit transformer for the Carrier FY5BNF024000AAAA fan coil unit. The transformer steps down 120V line voltage to the 24V AC signal required to power the thermostat, control board, and all low-voltage safety and switching circuits throughout the system. When this component fails, the entire control circuit goes dead — the thermostat goes blank, the system produces no response whatsoever, and no heating or cooling operation is possible. It is often the first component to inspect when a unit shows zero activity despite confirmed line power at the disconnect.

• Specs: 40VA rating | Primary: 120V AC | Secondary: 24V AC | OEM part number HT01CN241 | Factory-matched construction for Carrier FY5BNF024000AAAA
• OEM vs Generic: This OEM transformer meets Carrier's exact VA rating and insulation class specifications. Generic alternatives frequently run undersized VA ratings, causing overheating, nuisance tripping, and premature failure — especially when multiple zone valves or accessories share the control circuit load.
• Install difficulty: 2/5 — Always disconnect power at the breaker and verify with a non-contact voltage tester before beginning. Tools needed: flathead and Phillips screwdrivers, wire stripper, multimeter. Photograph all wiring connections before removal and match wire-for-wire on reinstall.
• Warranty: 1-year OEM factory warranty against defects in materials and workmanship. In-stock units ship the same business day from our warehouse.

Compatibility: Designed specifically for the Carrier FY5BNF024000AAAA fan coil unit. Verify your unit's data plate shows a 120V primary / 24V secondary, 40VA control transformer requirement before ordering. Our parts specialists are available to confirm fitment — contact us before you buy if you have any questions.