OEM Carrier 40VA Control Transformer for Model C50A502764 — Part# HT01BD702

This OEM control transformer (part number HT01BD702) is the factory-specified replacement for the Carrier C50A502764 packaged unit. The transformer steps down 120V line voltage to the 24V signal used by your thermostat, control board, and all low-voltage control components. When it fails, the entire control circuit goes dark — the thermostat goes blank, the system stops responding to calls for heating or cooling, and no fault codes appear because there's no power to generate them.

• Specs: 40VA rating | 120V primary / 24V secondary | Class 2 transformer | Factory-matched impedance and thermal protection — direct OEM replacement for part# HT01BD702
• OEM vs Generic: This factory OEM unit meets Carrier's exact VA rating and thermal cutout specifications. Generic transformers often run undersized VA capacity, leading to premature failure under normal control-circuit load — especially in multi-stage or heat pump configurations.
• Install difficulty: 2/5 — Shut off all power at the breaker before beginning. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter (to confirm 24V output after install). Label or photograph all low-voltage wiring before disconnecting. The transformer mounts to the control panel with two screws and uses push-on or screw terminals.
• Warranty: 1-year OEM factory warranty against defects. In stock and ships same business day from our warehouse.

Compatibility: Engineered specifically for the Carrier C50A502764 commercial packaged unit. Confirm your existing transformer's VA rating and primary/secondary voltages from the data plate or wiring diagram before ordering. Our HVAC parts specialists are available to verify fitment — order with confidence and get back up and running today.