OEM Carrier Transformer 40VA 120V to 24V for Model C48A602064

This is the factory OEM replacement transformer (part number HT01BD702) for the Carrier C48A602064 packaged unit. The transformer steps down line voltage from 120V to the 24V signal used by your thermostat, control board, contactor coil, and all low-voltage control circuits. When the transformer fails, the entire control circuit goes dead — the thermostat goes blank, the system will not respond to any call for heating or cooling, and no components will energize. A failed transformer is often mistaken for a thermostat or control board fault, so always confirm 24V output at the secondary terminals before replacing more expensive components.

• Specs: 40VA rating | Primary: 120V | Secondary: 24V | OEM part number HT01BD702 | Compact, direct-fit design for Carrier C48A602064 packaged unit
• OEM vs Generic: This OEM transformer is wound to factory specifications, ensuring the correct VA rating and voltage tolerances. Undersized or off-spec generic transformers can overheat, trip their internal fuse, and cause intermittent control failures that are difficult to diagnose.
• Install difficulty: 2/5 — Disconnect all power before beginning. Tools needed: flat-head and Phillips screwdrivers, multimeter, wire nuts or spade connectors. Label or photograph all low-voltage wiring before disconnecting. Confirm 120V input with a meter before energizing the new unit.
• Warranty: 1-year OEM factory warranty against defects in materials and workmanship. Ships same business day from our stocked warehouse.

Compatibility: Engineered specifically for the Carrier C48A602064 packaged unit. Cross-reference OEM part number HT01BD702 on your unit's wiring diagram label before ordering. If you need fitment verification, our HVAC parts specialists are available to confirm compatibility before you purchase — same-day shipping on all in-stock orders.