OEM Carrier Transformer 40VA 230V/115V for Model 09DE064900

This OEM Carrier transformer (part# HT01BC208) is the factory-specified step-down transformer for the Carrier 09DE064900. The transformer converts high-voltage line power to the low-voltage control circuit that powers your thermostat, control board, and all 24V switching components. When the transformer fails, you'll typically experience a complete loss of control voltage — nothing responds, the thermostat goes blank, and the system will not start at all. A failed transformer can also trip repeatedly due to a short in the low-voltage wiring; always inspect the secondary circuit before installing a replacement.

• Specs: 40VA rating | 230V primary voltage | 115V secondary voltage | Totaline OEM-grade construction | Factory cross-references: 320659-301, 2-05757-1
• OEM vs Generic: OEM transformers are wound and potted to exact Carrier factory specifications, ensuring precise voltage output and thermal protection. Generic units often lack proper VA headroom, leading to early burnout under full control-circuit load.
• Install difficulty: 2/5 — Shut off all power at the disconnect and breaker before proceeding. Tools needed: flathead and Phillips screwdrivers, voltage tester, wire stripper. Label all low-voltage wires before disconnecting. Inspect secondary wiring for shorts prior to energizing the new transformer.
• Warranty: 1-year OEM factory warranty. In-stock and ships same business day from our warehouse.

Compatibility: Designed for Carrier model 09DE064900. Also fits Bryant and Payne units sharing the HT01BC208 specification. Verify primary and secondary voltages on your unit's data plate before ordering. Our fitment team is available to confirm compatibility before you buy — ships today!