OEM Carrier 40VA Control Transformer HT01CN241 for Model FH4CNB004000AAAA

This is the factory OEM replacement transformer (part number HT01CN241) for the Carrier FH4CNB004000AAAA fan coil air handler. The transformer is the backbone of your system's low-voltage control circuit — it steps 120V line voltage down to 24V AC to power the thermostat, control board, and all relay coils. When the transformer fails, absolutely nothing works: the thermostat goes dark, the system won't respond to any call for heating or cooling, and you may detect a burnt or overheated smell near the air handler cabinet.

• Specs: 40VA rating | 120V primary / 24V secondary | Factory-matched OEM windings | Designed for continuous-duty HVAC control circuit use
• OEM vs Generic: The OEM HT01CN241 transformer meets Carrier's exact VA rating and insulation class. Undersized or off-brand transformers can overheat under load from multiple zone valves or relays, causing repeated nuisance failures and potential control board damage.
• Install difficulty: 2/5 — Disconnect power at the breaker before beginning. Tools needed: flathead and Phillips screwdrivers, multimeter (to verify 24V output after install), wire nuts or spade connectors. Label all low-voltage wires before disconnecting from secondary terminals.
• Warranty: 1-year OEM factory warranty. In-stock and ships same business day from our warehouse.

Compatibility: Engineered specifically for the Carrier FH4CNB004000AAAA fan coil air handler. Always verify your existing transformer's VA rating and primary/secondary voltages on the unit data plate before ordering. Our HVAC parts specialists are available to confirm fitment — just reach out before you buy. Order today and receive same-day shipping on in-stock OEM parts.