OEM Carrier Control Transformer 40VA 230V/115V for Model 09DE064C800

This is the factory OEM replacement control transformer (part number HT01BC208) for the Carrier 09DE064C800. The transformer steps down incoming line voltage to power the low-voltage control circuit that operates your thermostat, contactors, and all safety controls. When it fails, the entire system loses communication — the thermostat goes blank, no heating or cooling stage responds, and in many cases a blown 3-amp fuse is the first sign of trouble.

• Specs: 40VA rating | 230V primary input | 115V secondary output | Totaline/Carrier OEM factory part | Cross-references: 320659-301, 2-05757-1
• OEM vs Generic: This OEM unit is wound to exact factory tolerances for the 09DE064C800 control circuit. Generic transformers often carry lower VA ratings or looser voltage tolerances, risking nuisance tripping or premature failure of downstream controls.
• Install difficulty: 2/5 — Always disconnect power at the breaker before starting. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter (to confirm zero voltage before touching wiring). Photograph all wiring connections before removal. Transfer wires one at a time to the new unit.
• Warranty: 1-year OEM factory warranty. In-stock unit ships the same business day from our warehouse.

Compatibility: Designed for use in Carrier model 09DE064C800 equipment. Always verify primary voltage, secondary voltage, and VA rating against your unit's data plate before ordering. Have a question about fitment? Our HVAC parts team will confirm compatibility before you buy — contact us today and get your system back up and running fast.