OEM Carrier 40VA Control Transformer HT01CN236 for Model FX4ANF036000ABAA

This OEM control transformer (part# HT01CN236) is the factory-specified replacement for the Carrier FX4ANF036000ABAA fan coil air handler. The transformer steps line voltage (120V) down to 24V AC to power the low-voltage control circuit — including the thermostat, contactor coil, and control board. When this transformer fails, the entire control circuit goes dead: the thermostat goes blank, the system refuses to respond to any call for heating or cooling, and nothing operates. A blown fuse on the secondary side is often the first clue the transformer has failed or been overloaded.

• Specs: 40VA rating | Primary: 120V AC | Secondary: 24V AC | Direct OEM replacement | Part number HT01CN236 | Factory-matched output for stable low-voltage control signal
• OEM vs Generic: OEM transformers are wound to exact VA and voltage specifications, ensuring clean 24V output under load. Undersized or off-spec generic units can cause nuisance tripping, control board errors, or premature contactor coil burnout.
• Install difficulty: 2/5 — Disconnect power at the breaker before beginning. Tools needed: flathead and Phillips screwdrivers, multimeter, wire nuts or push-in connectors. Verify primary voltage at the unit before installing. Check for a short in the low-voltage wiring if the original transformer failed with a blown fuse — replacing the transformer without correcting the root cause will burn out the new unit.
• Warranty: 1-year OEM factory warranty. In stock and ships same business day from our warehouse.

Compatibility: Engineered specifically for the Carrier FX4ANF036000ABAA fan coil air handler. Always confirm the 40VA rating and 120V primary voltage against your unit's data plate before ordering. Our fitment team is available to verify compatibility before you buy — order with confidence and get your system back online today.