OEM Carrier Control Transformer 40VA for Model C4850C50ZN050600

This is the OEM factory-replacement control transformer (part# HT01BD236) designed specifically for the Carrier C4850C50ZN050600 packaged unit. The transformer steps down 120V line voltage to 24V AC to power the low-voltage control circuit — including the thermostat, contactor coil, and all safety switches. When this transformer fails, the entire control circuit goes dead: the thermostat goes blank, the system won't respond to any call for heating or cooling, and no safety or diagnostic codes will appear on the control board.

• Specs: 40VA rated | 120V primary / 24V secondary | Direct OEM replacement | Part number HT01BD236 | Factory-matched impedance and thermal protection
• OEM vs Generic: This OEM transformer is wound to Carrier's exact VA rating and insulation class. Generic transformers frequently underrate their VA capacity, causing overheating and early burnout — especially when multiple accessories share the 24V circuit.
• Install difficulty: 2/5 — Shut off power at the disconnect and breaker before starting. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter (to verify 24V output after install). Photograph all low-voltage wiring connections before disconnecting. The transformer mounts to the control panel with two screws and uses spade or wire-nut connections.
• Warranty: 1-year OEM factory warranty. In-stock and ships same business day from our warehouse.

Compatibility: Engineered as a direct OEM replacement for the Carrier C4850C50ZN050600 packaged unit. Always verify the 40VA rating and primary/secondary voltages on your unit's data plate before ordering. If your system has added accessories such as an air purifier or humidifier on the 24V circuit, confirm total VA load does not exceed transformer capacity. Our parts specialists are available to verify fitment before you order — in stock and ready to ship today.