OEM Carrier Control Transformer 40VA 120V to 24V for Model FB4ANF036010AFAA

This is the genuine OEM replacement transformer (part# HT01CN236) for the Carrier FB4ANF036010AFAA fan coil air handler. The control transformer steps down 120V line voltage to 24V to power the low-voltage control circuit — including your thermostat, relay coils, and control board. When this component fails, the entire control circuit goes dead: your thermostat goes blank, the system makes no response to any call for heating or cooling, and in some cases a blown fuse on the control board is the first visible symptom. Replacing the transformer is the correct fix once you've confirmed the fuse and wiring are intact.

• Specs: 40VA rating | Primary: 120V AC | Secondary: 24V AC | Factory OEM part number HT01CN236 | Direct drop-in fit for Carrier FB4ANF036010AFAA air handler
• OEM vs Generic: This is a genuine Carrier OEM transformer wound to exact VA and voltage specifications. Generic alternatives often run under-rated VA, causing thermal overload trips and premature failure — especially in systems with zone boards or multiple relay loads drawing near the 40VA limit.
• Install difficulty: 2/5 — Shut off power at the breaker and disconnect the low-voltage wiring before starting. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter to verify 24V output after install. Always label wires before disconnecting. If the secondary reads 0V after install, recheck primary connections.
• Warranty: 1-year OEM factory warranty against defects. In-stock and ships same business day from our warehouse.

Compatibility: Designed specifically for the Carrier FB4ANF036010AFAA fan coil air handler. Verify primary voltage (120V) and VA rating (40VA) on your unit's data plate before ordering. If you have a 208/240V primary application, do not substitute — contact our team to confirm fitment. Our HVAC parts specialists are available to verify compatibility before you order, so you get the right part the first time.