OEM Carrier 40VA Control Transformer for Model FX4CNF048010AAAA — Part# HT01CN241

This OEM replacement transformer (part# HT01CN241) is the factory-specified control circuit transformer for the Carrier FX4CNF048010AAAA fan coil air handler. The transformer steps down 120V line voltage to the 24V AC signal that powers your thermostat, control board, and all low-voltage switching circuits. When this component fails, the entire control circuit goes dark — your thermostat displays nothing, the system won't respond to any calls for heating or cooling, and the unit sits completely dead despite power being present at the disconnect.

• Specs: 40VA rated | 120V primary / 24V secondary | Factory-matched OEM tolerances | Designed for Carrier FX4CNF048010AAAA air handler applications
• OEM vs Generic: This OEM unit (HT01CN241) is wound and encapsulated to Carrier's exact VA and voltage specifications. Generic transformers often run undersized VA ratings, causing overheating under full control-circuit load and premature failure — particularly in systems with electronic air cleaners or zone controllers drawing additional 24V current.
• Install difficulty: 2/5 — Shut off power at the disconnect and breaker before proceeding. Tools needed: flathead and Phillips screwdrivers, wire stripper, multimeter, wire nuts. Photograph all wiring connections before disconnecting. Verify 24V output with a multimeter after installation before restoring full system power.
• Warranty: 1-year OEM factory warranty against defects. Ships same business day from our climate-controlled warehouse — order by 3PM local time to go out today.

Compatibility: Engineered specifically for the Carrier FX4CNF048010AAAA 4-ton fan coil air handler. Confirm your unit's data plate shows 120V/24V control circuit and 40VA transformer rating before ordering. Cross-references OEM part number HT01CN241. Not sure if this is the right part? Our HVAC parts specialists verify fitment before every order — call or chat before you buy.