OEM Carrier Control Transformer 40VA 230V/115V for Model 09DE054C800

This is the OEM factory-specified control transformer for the Carrier 09DE054C800. The transformer steps down line voltage to the lower secondary voltage required to power the unit's control circuit. When this part fails, the entire control circuit goes dead — thermostats won't respond, contactors won't energize, and the system will not operate at all. If your Carrier unit has no 24V control signal and you've already ruled out a tripped breaker, this transformer is the most common cause.

• Specs: 40VA rating | 230V primary voltage | 115V secondary voltage | OEM Part Number HT01BC208 | Cross-references: 320659-301, 2-05757-1
• OEM vs Generic: This is a genuine Totaline/Carrier OEM part — factory-wound to exact VA and voltage tolerances. Aftermarket transformers often use lower-grade core laminations, resulting in higher heat buildup, shortened service life, and potential nuisance tripping of fuses or breakers.
• 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. Photograph all wiring connections before disconnecting. Verify primary and secondary voltages with your meter after installation before re-energizing the control circuit.
• Warranty: 1-year OEM factory warranty. In stock — ships same business day from our warehouse.

Compatibility: Designed for the Carrier 09DE054C800. Also fits Bryant and Payne equipment sharing the same transformer specification. Always verify the VA rating, primary voltage, and secondary voltage on your unit's data plate or wiring diagram before ordering. Have questions about fitment? Our HVAC parts specialists will verify compatibility before you buy.