OEM Carrier 40VA Control Transformer HT01CN241 for Model FY5BNF036010AAAA

This OEM control transformer (part# HT01CN241) is the factory-specified replacement for the Carrier FY5BNF036010AAAA fan coil unit. The transformer steps down 120V line voltage to the 24V signal required to power the control board, thermostat circuit, and all low-voltage relay coils throughout the system. When this component fails, the entire control circuit goes dead — your thermostat loses power, the unit won't respond to any call for heating or cooling, and nothing operates despite line voltage being present at the unit.

• Specs: 40VA rated | Primary: 120V AC | Secondary: 24V AC | Class 2 transformer | Replaces OEM part number HT01CN241
• OEM vs Generic: This factory OEM transformer is wound to exact VA and voltage tolerance specifications for the FY5BNF036010AAAA. Generic transformers frequently run undersized VA ratings, causing overheating, nuisance tripping of the built-in fuse, and premature failure — especially in systems with multiple 24V accessories like humidistats and zone controllers.
• Install difficulty: 2/5 — Disconnect all power to the unit before beginning. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, wire nuts or terminal connectors, and a 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 in materials and workmanship. Orders placed before 3PM EST ship same business day from our climate-controlled warehouse.

Compatibility: Designed and factory-matched for Carrier model FY5BNF036010AAAA fan coil units. Verify your existing transformer's VA rating and primary/secondary voltages on the unit data plate before ordering to confirm fitment. Our HVAC parts specialists are available to verify compatibility before you buy — no guesswork required.