OEM Carrier Control Transformer 40VA 120V/24V for Model C4850C48ZG040600

This is the genuine OEM replacement transformer (part number HT01BD236) for the Carrier C4850C48ZG040600 packaged unit. The control transformer steps down line voltage from 120V to 24V to power the entire low-voltage control circuit — including the thermostat, contactor coil, and control board. When this transformer fails, the entire system goes dark: the thermostat loses power, no calls for heating or cooling are answered, and the unit will not respond at all. A blown transformer is often caused by a downstream short in the control wiring, so always inspect low-voltage wiring and check for shorts before installing the replacement.

• Specs: Primary voltage: 120V AC | Secondary voltage: 24V AC | VA rating: 40VA | OEM part number: HT01BD236 | Factory-matched for C4850C48ZG040600
• OEM vs Generic: This is a genuine Carrier OEM transformer wound to exact factory VA and voltage specifications. Generic transformers can run outside rated tolerance, causing nuisance tripping, premature failure of the control board, or undersupply to the contactor coil.
• Install difficulty: 2/5 — Disconnect power at the disconnect box and verify zero voltage with a multimeter before beginning. Tools needed: flathead and Phillips screwdrivers, wire stripper, multimeter. Label or photograph all wiring connections before removing the old transformer. Check for downstream shorts with an ohmmeter prior to energizing the new unit.
• Warranty: 1-year OEM factory warranty against defects. In stock and ships same business day from our warehouse.

Compatibility: Engineered as a direct OEM replacement for the Carrier C4850C48ZG040600 packaged unit. Confirm your unit's control voltage requirement (24V) and transformer VA rating on the data plate before ordering. Have questions about fitment? Our HVAC parts specialists verify compatibility before you buy — ships today.