OEM Carrier 40VA Control Transformer HT01CN241 for Model FA4BNC018008AAAA

This is the OEM factory-specified control transformer (part number HT01CN241) for the Carrier FA4BNC018008AAAA air handler. The transformer steps down line voltage (120V) to the 24V AC signal that powers your thermostat, control board, and all low-voltage safety circuits. When this component fails, the entire control circuit goes dark — your thermostat goes blank, the system ignores calls for heating or cooling, and no error codes will display because the board itself has no power. A failed transformer is one of the most commonly misdiagnosed HVAC faults, often mistaken for a bad thermostat or control board.

• Specs: 40VA rated | Input: 120V AC | Output: 24V AC | OEM part number HT01CN241 | Factory-matched for Carrier FA4BNC018008AAAA air handler wiring configuration
• OEM vs Generic: This is the exact OEM unit shipped in Carrier factory production. Generic transformers often carry undersized VA ratings that can sag under full control-circuit load, causing intermittent lockouts and premature secondary winding failure.
• Install difficulty: 2/5 — Shut off all power at the breaker before beginning. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter (to verify 24V output after install). Photograph existing wiring connections before disconnecting. Primary and secondary leads are typically color-coded; match wire gauge and terminal positions carefully.
• Warranty: 1-year OEM factory warranty against defects. In-stock and ships same business day from our warehouse.

Compatibility: Designed for the Carrier FA4BNC018008AAAA fan coil air handler. Verify your existing transformer's VA rating and input/output voltage on the unit data plate before ordering. If your system has added accessories such as UV lights or zone controls that draw additional VA load, consult our technical team before purchasing. Questions about fitment? Our HVAC parts specialists confirm compatibility before you order — call or chat today.