OEM Carrier 40VA Control Transformer HT01BD702 for Model C50A902764

This OEM Carrier transformer (part number HT01BD702) is the factory-specified replacement for the C50A902764 packaged unit. The transformer steps line voltage (120V) down to the 24V signal voltage that powers your thermostat, control board, contactor coil, and every other low-voltage component in the system. When the transformer fails, the entire control circuit goes dead — the thermostat goes blank, the system won't respond to any commands, and nothing turns on. Replacing a failed transformer is often the fastest and most affordable fix for a completely unresponsive HVAC unit.

• Specs: 40VA rating | Primary: 120V | Secondary: 24V | Factory-wound coil | Thermally protected | Direct OEM replacement for part number HT01BD702
• OEM vs Generic: This is a genuine OEM Carrier transformer wound to exact factory specifications. Generic transformers frequently underperform on VA capacity, causing nuisance tripping, premature failure, or insufficient voltage under full control-circuit load — especially in multi-stage or communicating systems.
• Install difficulty: 2/5 — Disconnect all power before servicing. Tools needed: flathead and Phillips screwdrivers, wire stripper, multimeter, needle-nose pliers. Confirm incoming line voltage is zero before touching any terminals. Label all wires before disconnecting.
• Warranty: 1-year OEM factory warranty. In stock and ships same business day from our warehouse.

Compatibility: Designed specifically for the Carrier C50A902764 commercial packaged rooftop unit. Always verify your existing transformer's primary voltage, secondary voltage, and VA rating against your unit's data plate before ordering. If you're unsure about fitment, our HVAC parts specialists can confirm compatibility before you buy.