OEM Carrier 40VA Control Transformer for Model FE4ANB003000ABAA Air Handler

This is the OEM factory-replacement control transformer (part# HT01CN236) for the Carrier FE4ANB003000ABAA air handler. The transformer steps down 120V line voltage to 24V AC to power the control board, thermostat circuit, and all low-voltage components throughout the system. When this transformer fails, nothing in the control circuit responds — the thermostat goes blank, the air handler won't energize, and no heating or cooling calls are answered. It is often the first component to inspect when the entire system appears completely unresponsive.

• Specs: 40VA rating | Primary: 120V AC | Secondary: 24V AC | OEM part number HT01CN236 | Direct plug-in replacement with factory-matched terminals
• OEM vs Generic: OEM transformers are wound to exact VA and voltage tolerances required by the Carrier control board. Undersized or off-tolerance generic units can cause erratic thermostat behavior, nuisance tripping of the secondary fuse, or premature control board failure.
• Install difficulty: 2/5 — Disconnect power at the disconnect and breaker before servicing. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter (verify 0V before touching wiring). Note wire colors or photograph connections before removing the old transformer.
• Warranty: 1-year OEM factory warranty. In-stock and ships same business day from our warehouse.

Compatibility: Designed specifically for the Carrier FE4ANB003000ABAA fan coil air handler. Confirm your existing transformer's VA rating and primary/secondary voltages on the unit data plate before ordering. Our HVAC parts specialists are available to verify fitment — order with confidence and get your system back online fast.