OEM Carrier Control Transformer 40VA 230V/115V for Model 09DE064600

This OEM Carrier control transformer (part number HT01BC208) is the factory-specified replacement for the Carrier 09DE064600. The transformer steps down the primary line voltage to the secondary voltage required to power the low-voltage control circuit in your HVAC system. When this transformer fails, the entire control circuit loses power — the thermostat goes blank, the system will not call for heating or cooling, and nothing responds. Replacing a failed transformer is one of the most effective repairs you can make to restore full system operation quickly.

• Specs: 40VA rating | 230V primary voltage | 115V secondary voltage | Totaline/Carrier OEM-matched design | Factory tolerance for reliable control circuit operation
• OEM vs Generic: This is a genuine OEM Carrier part. Generic transformers often use lower-grade core materials and windings, increasing risk of overheating, nuisance tripping, or premature failure — especially under high-demand conditions.
• Install Difficulty: 2/5 — Shut off all power to the unit at the disconnect and breaker before beginning. Tools needed: flathead and Phillips screwdrivers, wire stripper, multimeter, needle-nose pliers. Always photograph or label existing wiring before disconnecting. Check for a shorted control wire or failed board that may have caused the original transformer failure before installing the replacement.
• Warranty: 1-year OEM factory warranty. In stock and ships same business day from our warehouse.

Compatibility: Fits Carrier model 09DE064600. Cross-references include OEM part numbers 320659-301 and 2-05757-1. Verify primary and secondary voltage on your unit's data plate before ordering. Not sure if this is the right part? Our HVAC parts specialists verify fitment before you order — contact us anytime.