OEM Carrier 40VA Control Transformer HT01BC208 for Model 09DE064C100

This is the factory OEM replacement control transformer for the Carrier 09DE064C100, manufactured to exact Carrier specifications under part number HT01BC208. The transformer steps down line voltage from a 230V primary to a 115V secondary at 40VA, powering the low-voltage control circuit that coordinates your system's thermostat, contactor, and safety controls. When this transformer fails, the entire control circuit goes dead — your thermostat will show a blank screen, your system won't respond to any call for heating or cooling, and you may measure 0V at the secondary terminals with line voltage confirmed at the primary.

• Specs: 40VA rating | 230V primary | 115V secondary | 50/60 Hz | Totaline/Carrier OEM factory part — cross-references 320659-301 and 2-05757-1
• OEM vs Generic: This is a genuine Carrier OEM transformer with tight voltage regulation tolerances. Generic aftermarket transformers often exhibit voltage sag under load, which can cause erratic board behavior, nuisance lockouts, and premature control board failure.
• Install difficulty: 3/5 — Disconnect all power (line and control voltage) before servicing. Tools needed: multimeter, flathead and Phillips screwdrivers, wire nuts or spade terminals. Confirm 0V at all terminals before touching wiring. Photograph existing wiring connections before removal.
• Warranty: 1-year OEM manufacturer warranty. Ships same business day from our warehouse — order by 3PM local time for same-day dispatch.

Compatibility: Designed for the Carrier 09DE064C100. Verify your unit's data plate confirms 230V primary and 115V secondary before ordering. Also cross-references Bryant and Payne models sharing the HT01BC208 specification. Our parts team is available to verify fitment before you order — no guesswork required.