OEM Carrier 40VA Control Transformer HT01CN241 for Model FY4ANF048T00AAAA

This is the factory OEM replacement transformer (part number HT01CN241) for the Carrier FY4ANF048T00AAAA fan coil air handler. The transformer steps down 120V line voltage to 24V AC to power the entire low-voltage control circuit — including the thermostat, contactor coil, and control board. When this transformer fails, absolutely nothing in the system responds: the thermostat goes blank, the unit won't heat or cool, and no fault codes are generated because the control board itself has lost power. It is often the first component to suspect when a system goes completely silent with no obvious cause.

• Specs: 40VA rating | 120V primary / 24V secondary | Class 2 output | OEM part number HT01CN241 | Factory-matched for Carrier FY4ANF048T00AAAA air handlers
• OEM vs Generic: This OEM transformer is wound to exact factory VA and voltage tolerances. Undersized or off-brand transformers can sag under load, causing intermittent lockouts, nuisance tripping, or premature failure of downstream control components like contactors and boards.
• Install difficulty: 2/5 — Shut off all power at the breaker before beginning. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter. Label all 24V wiring before disconnecting. Verify 120V input and 24V output with a meter after installation before restoring full system power.
• Warranty: 1-year OEM factory warranty. In-stock and ships same business day from our warehouse.

Compatibility: Designed and factory-specified for the Carrier FY4ANF048T00AAAA 4-ton fan coil air handler. Confirm your unit's control circuit voltage requirements match 120V/24V 40VA before ordering. If you are unsure of fitment, our HVAC parts specialists will verify compatibility before your order ships — no guesswork required.