OEM Carrier Control Transformer 40VA 230V/115V for Model 09DE054600

This OEM Carrier control transformer (part number HT01BC208) is the factory-specified replacement for the Carrier 09DE054600. The transformer steps down the unit's line voltage to the control circuit voltage required to power the thermostat, control board, and low-voltage accessories. When this transformer fails, you'll typically see a completely unresponsive system — no thermostat display, no blower activation, and no response to any thermostat input. A failed transformer is often the result of a short in the low-voltage wiring or an overloaded secondary circuit.

• Specs: 40VA rating | 230V primary voltage | 115V secondary voltage | 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 factory VA and voltage specifications. Aftermarket units frequently fall short of rated VA capacity, causing nuisance trips and premature failure under normal HVAC load.
• Install difficulty: 2/5 — Shut off all power at the disconnect and breaker before beginning. Tools needed: flathead and Phillips screwdrivers, wire stripper, multimeter (to verify output voltage post-install). Photograph all wiring connections before removal.
• Warranty: 1-year OEM factory warranty. In-stock and ships same business day from our warehouse.

Compatibility: Designed for the Carrier 09DE054600. Always verify transformer VA rating and primary/secondary voltages against your unit's wiring diagram or data plate before ordering. Our HVAC parts specialists are available to confirm fitment — contact us before you order if you have any questions.