OEM Carrier Control Transformer 40VA 230/115V for Model 09DE044510

This OEM Carrier transformer (part number HT01BC208) is the factory-specified replacement for the Carrier 09DE044510. The transformer steps down line voltage to supply the low-voltage control circuit that powers your thermostat, contactor coil, and safety controls. When the transformer fails, the entire control circuit goes dead — the system will not respond to thermostat calls, and nothing will turn on. Common failure signs include a completely unresponsive thermostat, blown control fuses, or a unit that hums briefly then locks out.

• Specs: 40VA rated | 230V primary / 115V secondary | 50/60 Hz compatible | Totaline OEM factory part | Cross-references: 320659-301, 2-05757-1
• OEM vs Generic: This is a genuine Carrier Totaline OEM transformer, wound to exact VA and voltage tolerances. Generic transformers often fall short on VA capacity under heavy relay loads, causing nuisance trips, blown fuses, and premature failure of downstream controls.
• Install difficulty: 3/5 — Shut off all power at the disconnect and breaker before beginning. Tools needed: flathead and Phillips screwdrivers, wire stripper, needle-nose pliers, multimeter. Label and photograph all wiring connections before disconnecting the old unit. Double-check primary and secondary voltage taps before energizing.
• Warranty: 1-year OEM factory warranty. In-stock and ships same business day from our warehouse.

Compatibility: Designed for the Carrier model 09DE044510. Verify primary voltage supply and VA requirements on your unit's data plate before ordering. Not sure if this is the right part? Our HVAC parts specialists are available to confirm fitment before you buy — order with confidence and get back up and running fast.