OEM Carrier Transformer 120V–24V 40VA for Model 09DE054C100

This OEM Carrier transformer (part number HT01BC208) is the factory-specified replacement for the Carrier 09DE054C100. The transformer steps down line voltage from 120V to 24V AC to power the low-voltage control circuit — including the thermostat, control board, and all safety relays. When this component fails, the entire control circuit goes dead: the thermostat loses power, nothing calls for heating or cooling, and the system will not respond at all. A failed transformer is one of the most common causes of a completely unresponsive HVAC system.

• Specs: Primary voltage: 120V AC | Secondary voltage: 24V AC | VA rating: 40VA | OEM part number: HT01BC208 | Factory-matched for Carrier 09DE054C100
• OEM vs Generic: This is a genuine OEM Carrier transformer wound to exact factory VA and voltage specifications. Generic transformers often use undersized windings that run hot, trip the built-in thermal fuse prematurely, and fail within one season — costing you more in repeat repairs.
• Install difficulty: 2/5 — Always shut off power at the disconnect and breaker before servicing. Tools needed: flathead and Phillips screwdrivers, wire stripper, multimeter. Note wire colors and terminal labels before disconnecting. Installation typically takes 20–30 minutes.
• Warranty: 1-year OEM factory warranty against defects. In stock and ships same business day from our warehouse.

Compatibility: Designed and factory-matched for Carrier model 09DE054C100. Always verify your existing transformer's primary voltage, secondary voltage, and VA rating on the unit's data plate before ordering. Need help confirming fitment? Our HVAC parts specialists verify compatibility before you buy — reach out before placing your order.