OEM Carrier 40VA Control Transformer HT01CN236 for Model FA4ANF030015AGAA

This OEM control transformer (part# HT01CN236) is the factory-specified replacement for the Carrier FA4ANF030015AGAA air handler. The transformer steps down 120V line voltage to 24V AC to power the low-voltage control circuit — including the thermostat, contactor coil, and control board. When the transformer fails, the entire control circuit goes dead: the thermostat goes blank, the system won't respond to any call for heating or cooling, and nothing operates. A failed transformer is often caused by a short in the 24V control wiring, so always inspect the secondary circuit before installing a replacement.

• Specs: 40VA rated | Primary: 120V AC | Secondary: 24V AC | OEM part number HT01CN236 | Factory-matched for Carrier FA4ANF030015AGAA air handlers
• OEM vs Generic: This OEM transformer is wound to exact factory VA and voltage tolerances. Undersized or off-tolerance generic transformers can overheat, trip their internal thermal fuse, or cause erratic low-voltage control behavior — leading to callbacks and repeat failures.
• Install difficulty: 2/5 — Shut off power at the disconnect and breaker before servicing. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter. Verify 24V output on the secondary terminals after installation. Always check for shorts on the 24V circuit before powering up.
• Warranty: 1-year OEM factory warranty. In stock and ships same business day from our warehouse.

Compatibility: Designed for the Carrier FA4ANF030015AGAA air handler. Verify your existing transformer's VA rating and primary/secondary voltages on the unit data plate or wiring diagram before ordering. Our fitment team is available to confirm compatibility before you buy — order with confidence and get back up and running today.