OEM Carrier Transformer 40VA 120V/24V for Model FE4ANF002L00ABAA

This OEM replacement transformer (part number HT01CN236) is the factory-specified control circuit transformer for the Carrier FE4ANF002L00ABAA air handler. The transformer steps down line voltage from 120V to the 24V AC signal that powers the thermostat, control board, relays, and zone valves throughout your system. When it fails, the entire low-voltage control circuit goes dead — your thermostat goes blank, the system won't respond to any call for heating or cooling, and no error codes appear because the board itself has no power. This is one of the most overlooked failure points during diagnostics.

• Specs: Input 120V AC | Output 24V AC | 40VA rated | Factory OEM part number HT01CN236 | Matches original mounting footprint and terminal configuration
• OEM vs Generic: OEM transformers are wound and rated to exact factory VA tolerances, protecting your control board from voltage fluctuations. Generic units frequently under-deliver VA capacity under load, causing nuisance lockouts, control board brownouts, and premature component failure across the entire low-voltage circuit.
• Install difficulty: 2/5 — Disconnect power at the breaker before beginning. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter. Label or photograph all low-voltage wiring before removing the old transformer. Verify 24V output after installation before restoring full system power.
• Warranty: 1-year OEM factory warranty. In stock and ships same business day from our warehouse.

Compatibility: Designed specifically for the Carrier FE4ANF002L00ABAA air handler. Confirm your existing transformer's input/output voltage and VA rating on the unit's data plate or wiring diagram before ordering. If you're unsure, our fitment team is available to verify compatibility before you buy — same-day shipping means you're back up and running fast.