OEM Carrier Control Transformer 40VA 230V — HT01BC208 for Model 09DE044100

This is the OEM factory-specified control transformer for the Carrier 09DE044100. The transformer steps down the primary supply voltage to the 24V secondary signal that powers your thermostat, control board, contactors, and every other low-voltage component in the system. When this transformer fails, the entire control circuit goes dead — the thermostat loses power, nothing responds to a call for heating or cooling, and the system appears completely inoperative.

• Specs: 40VA rating | 230V primary input | 115V secondary output | 50/60 Hz | OEM Part # HT01BC208 | Cross-references: 320659-301, 2-05757-1
• OEM vs Generic: This is a genuine Carrier OEM transformer meeting exact factory VA and voltage tolerances. Generic transformers often run under-rated VA, causing overheating, nuisance tripping of the built-in fuse, and premature control board damage — always choose OEM for a long-term fix.
• Install difficulty: 2/5 — Shut off all power to the unit before starting. Label and photograph all low-voltage wiring before disconnecting. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter to confirm 24V output after installation. Check for a shorted low-voltage wire (common transformer killer) before energizing.
• Warranty: 1-year OEM manufacturer warranty. Ships same business day from our warehouse stock.

Compatibility: Designed for the Carrier 09DE044100. Verify your unit's data plate primary voltage and VA requirement match HT01BC208 specifications before ordering. Not sure it fits? Our HVAC parts specialists confirm fitment before you buy — contact us anytime.