OEM Carrier Transformer 40VA 120V to 24V for Model FE4ANB003L00ABAA

This OEM control circuit transformer (part# HT01CN236) is the factory-specified replacement for the Carrier FE4ANB003L00ABAA air handler. The transformer steps down 120V line voltage to the 24V AC signal required to power the control board, thermostat, and all low-voltage components in your system. When this transformer fails, the entire control circuit goes dead — the thermostat display goes blank, the system won't respond to any calls for heating or cooling, and the air handler will not operate at all.

• Specs: 40VA rating | 120V primary / 24V secondary | Factory-matched OEM replacement | OEM Part Number HT01CN236 | Designed for low-voltage HVAC control circuits
• OEM vs Generic: This is the exact factory transformer specified by Carrier. OEM units are wound to precise VA tolerances that protect the control board from voltage fluctuations. Generic transformers may underperform under full load, risking nuisance tripping or premature board failure.
• Install difficulty: 2/5 — Power down and lock out the unit at the disconnect before beginning. Tools needed: flathead and Phillips screwdrivers, wire stripper, multimeter. Verify 24V output after installation before restoring thermostat connections. Always check for a shorted low-voltage circuit before replacing the transformer, as a wiring short will blow the new unit immediately.
• Warranty: 1-year OEM factory warranty. In stock and ships same business day from our warehouse.

Compatibility: Engineered for the Carrier FE4ANB003L00ABAA air handler. Confirm 120V primary and 40VA rating on your existing transformer's label before ordering. If you are unsure of fitment, our parts specialists can verify compatibility using your full model and serial number before you purchase.