OEM Carrier Control Transformer 40VA for Model FB4CNF030T00ABAA

This OEM control transformer (part# HT01CN241) is the factory-specified replacement for the Carrier FB4CNF030T00ABAA fan coil air handler. The transformer steps down 120V line voltage to 24V AC, powering the entire low-voltage control circuit — including the thermostat, contactor coil, and control board. When it fails, the thermostat goes dark, the system refuses all calls for heating or cooling, or the secondary fuse blows repeatedly under a shorted load.

• Specs: 40VA rated | Primary: 120V AC | Secondary: 24V AC | Ring-style mount | Factory-matched impedance for Carrier low-voltage control circuits
• OEM vs Generic: This is a genuine Carrier OEM part (HT01CN241) wound to exact VA and impedance specifications. Generic transformers often run undersized VA ratings, causing overheating and nuisance fuse trips under normal thermostat load — particularly in systems with WiFi stats or zoning boards that draw additional current.
• Install difficulty: 2/5 — Disconnect power at the breaker and verify voltage is absent before starting. Tools needed: flathead and Phillips screwdrivers, multimeter, wire nuts or terminal connectors. Label or photograph all low-voltage wiring before disconnecting. Confirm the blown 3A fuse on the control board is replaced as part of the repair.
• Warranty: 1-year OEM factory warranty. In-stock units ship same business day when ordered before 3PM local time.

Compatibility: Designed for the Carrier FB4CNF030T00ABAA fan coil air handler. Verify your unit's control circuit voltage (24V secondary) and VA demand before ordering — units with added accessories such as electronic air cleaners or zone controllers may require a 50VA upgrade. Cross-references OEM part number HT01CN241. Our parts specialists are available to confirm fitment before you order — don't guess on a control circuit component.