OEM Carrier 40VA Control Transformer HT01BC208 for Model 09DE054C900

This OEM replacement transformer (part number HT01BC208) is the factory-specified control transformer for the Carrier 09DE054C900. It steps line voltage (120V) down to 24V AC to power the low-voltage control circuit — including the thermostat, contactor coil, and all safety controls. When this transformer fails, the entire control system goes dark: the thermostat loses power, the unit won't respond to any call for heating or cooling, and no safety faults can even be reported. A blown transformer is often caused by a wiring short elsewhere in the low-voltage circuit, so always inspect the 24V wiring before installing a replacement.

• Specs: 120V primary | 24V secondary | 40VA rating | Factory OEM part number HT01BC208 | Carrier-matched for direct fit
• OEM vs Generic: This is a genuine Carrier OEM transformer wound to exact factory VA and voltage tolerances. Generic transformers frequently underperform on VA capacity, causing nuisance tripping or premature burnout under normal control-circuit loads.
• Install Difficulty: 2/5 — Shut off all power to the unit before starting. Tools needed: flathead and Phillips screwdrivers, wire stripper, multimeter, wire nuts. Photograph all wiring connections before disconnecting the old transformer. Verify there are no short circuits in the 24V wiring before powering up.
• Warranty: 1-year OEM factory warranty. In stock and ships same business day from our warehouse.

Compatibility: Designed as a direct OEM replacement for Carrier model 09DE054C900. Verify your existing transformer's primary voltage, secondary voltage, and VA rating against your unit's data plate before ordering. Our team is available to confirm fitment — order with confidence and receive fast, same-day shipping.