OEM Carrier 40VA Control Transformer for Model C4850C48ZG075610

This OEM replacement transformer (part# HT01BD236) is the factory-specified step-down transformer for the Carrier C4850C48ZG075610 packaged unit. It converts 120V primary voltage down to the 24V AC signal that powers the control board, thermostat, and all low-voltage control circuits throughout the system. When this transformer fails, the entire control circuit loses power — the thermostat goes blank, the system won't respond to any calls for heating or cooling, and no error codes are displayed because the board itself has no power to operate.

• Specs: 40VA rating | 120V primary / 24V secondary | Class 2 output | OEM part number HT01BD236 | Factory-matched construction for Carrier packaged systems
• OEM vs Generic: This OEM transformer is wound to exact VA and voltage specifications required by the Carrier C4850C48ZG075610 control board. Undersized or off-tolerance generic transformers can cause nuisance tripping, control board brownouts, and premature contactor failure — always match OEM specs on transformers.
• Install difficulty: 2/5 — Shut off all power at the disconnect and breaker before beginning. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, wire stripper, multimeter. Label or photograph all low-voltage wiring connections before removing the old unit. Confirm 24V output with a multimeter after install before restoring full power.
• Warranty: 1-year OEM factory warranty. In-stock and ships same business day from our warehouse.

Compatibility: Designed specifically for the Carrier C4850C48ZG075610 packaged unit. Verify primary voltage and VA rating on your unit's data plate before ordering. If you're unsure of fitment or need to confirm your exact transformer spec, our HVAC parts specialists are available to verify compatibility before you order — ensuring you get the right part the first time.