OEM Carrier Control Transformer 40VA 120V/24V for Model C4850C50AW06061

This is the factory OEM replacement control transformer (part number HT01BD236) for the Carrier C4850C50AW06061 packaged unit. The transformer steps down line voltage from 120V to 24V to power the low-voltage control circuit — including the thermostat, contactor coil, and control board. When this transformer fails, the entire control circuit goes dead: the thermostat goes blank, the system won't respond to any commands, and no heating or cooling is possible. A failed transformer is often identified by measuring 0V on the 24V secondary side with full line voltage present on the primary.

• Specs: 40VA rated | 120V primary / 24V secondary | OEM part number HT01BD236 | Factory-matched to Carrier C4850C50AW06061 control circuit requirements
• OEM vs Generic: This is the exact OEM unit sourced from Carrier. Generic transformers frequently carry undersized VA ratings that cause overheating, nuisance tripping, and premature failure — especially under high-demand control loads. OEM ensures the correct VA headroom and terminal configuration right out of the box.
• Install difficulty: 2/5 — Disconnect all power before beginning. Tools needed: flathead and Phillips screwdrivers, wire stripper, multimeter. Label or photograph all low-voltage wiring before disconnecting. Confirm 0V at all terminals before handling. Reconnect low-voltage wiring first, then restore line voltage and verify 24V on secondary.
• Warranty: 1-year OEM factory warranty against defects. In stock and ships same business day from our warehouse.

Compatibility: Designed specifically for the Carrier C4850C50AW06061 packaged unit. Verify your existing transformer's VA rating and primary/secondary voltages on the unit data plate before ordering. If you're unsure about fitment, our HVAC parts specialists are available to confirm compatibility before you purchase — same-day shipping available on all in-stock orders.