OEM Carrier 40VA Control Transformer HT01CN241 for Model FH4CNF003000AAAA

This OEM control transformer (part number HT01CN241) is the factory-specified replacement for the Carrier FH4CNF003000AAAA fan coil unit. The transformer steps down 120V line voltage to the 24V signal voltage required by your thermostat, control board, and low-voltage safety circuits. When it fails, the result is typically a completely unresponsive system — the thermostat goes dark, the blower won't run, and no call for heating or cooling is answered. A blown fuse on the secondary side is often the first clue that the transformer has been overloaded or has shorted internally.

• Specs: 40VA rating | Primary: 120V AC | Secondary: 24V AC | OEM part number HT01CN241 | Factory-matched output tolerance for stable low-voltage control circuits
• OEM vs Generic: This OEM transformer is wound to Carrier's exact VA and voltage tolerances, ensuring reliable 24V output under full control-circuit load. Generic transformers with loose tolerances can cause nuisance trips, erratic thermostat behavior, and premature contactor coil failure.
• Install difficulty: 2/5 — Disconnect all power to the unit before beginning. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter to verify 24V output after installation. Photograph or label all low-voltage wiring before removing the old transformer.
• Warranty: 1-year OEM factory warranty. In-stock units ship same business day from our warehouse.

Compatibility: Engineered specifically for the Carrier FH4CNF003000AAAA fan coil unit. Always verify transformer VA rating and primary/secondary voltages on your unit's wiring diagram or data plate before ordering. Not sure it fits? Our HVAC parts specialists confirm fitment before you buy — ships same day when ordered before 3PM.