OEM Carrier 40VA Control Transformer HT01CN241 for Model FB4CNF036010ABAA

This OEM control transformer (part# HT01CN241) is the factory-specified replacement for the Carrier FB4CNF036010ABAA fan coil air handler. The transformer steps down 120V line voltage to 24V AC, powering the low-voltage control circuit that connects your thermostat, contactor, and control board. When this transformer fails, nothing in the system responds — the thermostat goes blank, the air handler won't start, and the condenser sits idle. If you're measuring no 24V output at the secondary terminals, this part is almost always the cause.

• Specs: 40VA output | Primary: 120V AC | Secondary: 24V AC | Direct OEM replacement | Factory-matched impedance and thermal protection | Part# HT01CN241
• OEM vs Generic: The OEM transformer is wound to exact VA and impedance specifications for the FB4CNF036010ABAA control circuit. Generic transformers often run under-rated VA, causing premature thermal trips and nuisance lockouts under full control circuit load.
• Install difficulty: 2/5 — Disconnect power at the breaker and verify with a multimeter before touching any wiring. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter. Label or photograph all wire connections before removal. The transformer mounts to the air handler cabinet with two screws and uses push-on or screw terminals.
• Warranty: 1-year OEM factory warranty. Ships same business day from our stocked warehouse.

Compatibility: Designed for the Carrier FB4CNF036010ABAA fan coil air handler. Verify your existing transformer's VA rating and primary/secondary voltages on the data plate before ordering. If you've blown multiple transformers, check for a short in the low-voltage wiring or an oversized fuse before replacing. Our parts team is available to confirm fitment — order with confidence and get back to comfort fast.