OEM Carrier 40VA Control Transformer for Model C4850C50Z2040600

This is the factory OEM replacement control transformer (part# HT01BD236) for the Carrier C4850C50Z2040600 packaged unit. The transformer steps down 120V line voltage to 24V AC to power the low-voltage control circuit — including the thermostat, contactor coil, gas valve, and control board. When the transformer fails, the entire control circuit goes dead: the thermostat goes blank, the system stops responding to calls for heating or cooling, and no components energize. A failed transformer is often misdiagnosed as a thermostat or control board issue, so always verify 24V output at the secondary terminals before replacing other parts.

• Specs: 40VA rating | Primary: 120V AC | Secondary: 24V AC | OEM part number HT01BD236 | Factory-matched output voltage and VA capacity for reliable low-voltage circuit performance
• OEM vs Generic: OEM transformers are wound and insulated to Carrier's exact specifications, ensuring stable 24V output under full load. Generic units may sag under peak draw, causing intermittent lockouts or nuisance tripping of the control circuit fuse.
• Install difficulty: 2/5 — Disconnect all power before servicing. Tools needed: flathead and Phillips screwdrivers, multimeter, wire nuts or spade terminals. Label or photograph all wire connections before removal. Verify 120V input and 24V output after installation before closing the cabinet.
• Warranty: 1-year OEM factory warranty against defects in materials and workmanship. In-stock and ships same business day from our warehouse.

Compatibility: Designed specifically for the Carrier C4850C50Z2040600 packaged unit. Always confirm the 40VA rating and 120V/24V voltage configuration against your unit's wiring diagram and data plate before ordering. Our parts team is available to verify fitment — order with confidence and get back up and running today.