OEM Carrier Control Transformer 40VA for Model C4850C50Z2035600

This is the OEM factory-specified control transformer (part number HT01BD236) for the Carrier C4850C50Z2035600 packaged unit. The transformer steps down 120V line voltage to the 24V signal voltage required by the thermostat, control board, contactor coil, and all low-voltage control circuit components. When this transformer fails, the entire control circuit goes dead — the thermostat goes blank, the system won't respond to any calls for heating or cooling, and no safety or staging functions will operate. It is often the first component to check when nothing in the system responds at all.

• Specs: 40VA rating | 120V primary / 24V secondary | OEM part number HT01BD236 | Factory-matched for Carrier C4850C50Z2035600 packaged unit control circuit
• OEM vs Generic: OEM transformers are wound and insulated to exact VA and voltage specifications. Generic units frequently under-deliver on VA capacity, causing nuisance trips, control board brownouts, and premature contactor coil failures — especially under high-demand multi-zone control circuits.
• Install difficulty: 2/5 — Disconnect all power before beginning. Tools needed: multimeter (to confirm 0V before touching wiring), flathead and Phillips screwdrivers, wire nuts or terminal connectors. Photograph or label all wiring connections before removing the old transformer. Verify incoming voltage and secondary output with a meter before closing the panel.
• Warranty: 1-year OEM factory warranty. In-stock and ships same business day from our warehouse.

Compatibility: Engineered as the direct OEM replacement for Carrier C4850C50Z2035600 packaged units using the HT01BD236 transformer. Confirm your unit's control circuit voltage requirements on the data plate before ordering. Our fitment team is available to verify compatibility before you purchase — same-day shipping on all in-stock orders.