OEM Carrier 40VA Control Transformer HT01BD236 for Model C50A204061

This OEM step-down transformer (part number HT01BD236) is the factory-specified replacement for the Carrier C50A204061 commercial packaged unit. The transformer converts 120V line voltage to the 24V AC signal that powers your thermostat, control board, contactor coil, and every other low-voltage component in the system. 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 faults will display because there's no power to display them.

• Specs: Primary: 120V AC | Secondary: 24V AC | VA Rating: 40VA | Factory-matched OEM tolerances | Replaces OEM part number HT01BD236
• OEM vs Generic: OEM transformers are wound and rated to exact factory specifications for the C50A204061's control circuit load. Generic units often carry loose VA tolerances that cause premature overload failure when multiple low-voltage components draw simultaneously.
• Install Difficulty: 2/5 — Disconnect power at the breaker and verify zero voltage before beginning. Tools needed: multimeter, flathead and Phillips screwdrivers, wire stripper. Label or photograph all low-voltage wire connections before disconnecting. Confirm incoming voltage matches transformer primary rating before energizing.
• Warranty: 1-year OEM factory warranty against defects. In stock and ships same business day from our climate-controlled warehouse.

Compatibility: Designed for the Carrier C50A204061 commercial rooftop/packaged unit. Verify your existing transformer's primary voltage, secondary voltage, and VA rating on the unit's data plate or wiring diagram before ordering. Our parts specialists are available to confirm fitment prior to purchase — reach out before you order if you have any questions.