OEM Carrier Transformer 40VA 120V to 24V Control Circuit for Model C48A605064

This OEM Carrier transformer (part number HT01BD702) is the factory-specified replacement for the C48A605064 packaged unit. The transformer steps down 120V line voltage to 24V AC, powering the entire low-voltage control circuit — including the thermostat, contactor coil, and control board. When this component fails, nothing in the system responds: the thermostat goes blank, the unit won't energize, and no call for heating or cooling will be answered. It is often the first component to inspect when a system goes completely unresponsive.

• Specs: 40VA rated | Primary: 120V AC | Secondary: 24V AC | OEM part number HT01BD702 | Factory-matched for Carrier C48A605064 packaged units
• OEM vs Generic: This OEM transformer is wound to exact factory VA and voltage tolerances. Generic transformers can run under-rated VA, causing overheating, blown fuses, or nuisance trips on the secondary circuit — problems that are difficult to diagnose and often damage downstream components.
• Install difficulty: 2/5 — Disconnect power at the disconnect box and verify zero voltage with a multimeter before beginning. Tools needed: flathead and Phillips screwdrivers, wire strippers, multimeter. Label or photograph all low-voltage wiring before disconnecting terminals. Reconnect leads to matching color or terminal labels.
• Warranty: 1-year OEM factory warranty against defects in materials and workmanship. In stock and ships same business day from our climate-controlled warehouse.

Compatibility: Engineered specifically for the Carrier C48A605064 packaged unit. Verify your unit's data plate shows a 120V primary / 24V secondary, 40VA control transformer before ordering. Not sure about fitment? Our HVAC parts specialists confirm compatibility before your order ships — just reach out.