OEM Carrier 40VA Control Transformer HT01CN236 for Model FX4ANF018000ABAA

This OEM step-down transformer (part number HT01CN236) is the factory-specified replacement for the Carrier FX4ANF018000ABAA fan coil air handler. The transformer converts 120V line voltage to the 24V AC signal that powers your thermostat, control board, and all low-voltage control circuits. When this component fails, the entire control system goes dark — the thermostat loses power, the unit won't respond to any call for heating or cooling, and nothing in the system operates. If you have 120V at the unit but zero voltage at the 24V secondary terminals, this transformer is the first component to replace.

• Specs: 40VA capacity | 120V primary input | 24V AC secondary output | Factory-matched OEM specification | Matches original mounting footprint and terminal configuration for Carrier FX4ANF018000ABAA
• OEM vs Generic: The OEM HT01CN236 transformer is wound and rated to exact Carrier factory tolerances, ensuring stable 24V output under full control-circuit load. Generic transformers may sag under peak demand, causing intermittent lockouts and nuisance tripping of low-voltage fuses.
• Install difficulty: 2/5 — Always shut off power at the disconnect and breaker before starting. Tools needed: flathead and Phillips screwdrivers, multimeter, wire nuts or terminal connectors. Verify 0V at primary terminals before touching wiring. Photograph all wiring connections before disconnecting the old unit.
• Warranty: 1-year OEM factory warranty against defects in materials and workmanship. Orders placed before cutoff ship the same business day from our stocked warehouse.

Compatibility: Engineered specifically for the Carrier FX4ANF018000ABAA fan coil air handler. Always confirm your unit's data plate shows 120V control power and cross-reference part number HT01CN236 before ordering. Our HVAC parts specialists are available to verify fitment — call or chat before you buy for total peace of mind. In stock and ready to ship today.