OEM Carrier 40VA Control Transformer for Model C48A606064 — Part HT01BD702

This OEM control transformer (part number HT01BD702) is the factory-specified replacement for the Carrier C48A606064 packaged unit. The transformer steps down line voltage from 120V to 24V to power the low-voltage control circuit — including the thermostat, contactor coil, and control board. When this component fails, the entire control circuit loses power: the thermostat goes blank, the system stops responding to calls for heating or cooling, and nothing works despite the unit having full line voltage at the disconnect.

• Specs: 40VA rating | 120V primary / 24V secondary | Designed for Carrier packaged unit control circuits | Factory-matched electrical characteristics for reliable long-term operation
• OEM vs Generic: OEM transformers from Carrier are wound to exact VA and impedance specifications, reducing the risk of nuisance tripping, overheating, or premature failure under peak control-circuit load. Generic alternatives may be under-rated and can fail within one season.
• Install difficulty: 2/5 — Disconnect all power before servicing. Tools needed: flathead and Phillips screwdrivers, wire stripper, multimeter. Always verify 0V at terminals before touching wiring. Label or photograph existing low-voltage wire connections prior to removal.
• Warranty: 1-year OEM factory warranty against defects. In-stock and ships same business day from our warehouse.

Compatibility: Engineered for the Carrier C48A606064 packaged unit. Verify your existing transformer's primary/secondary voltage and VA rating on the unit's data plate or wiring diagram before ordering to ensure a correct match. Our parts specialists are available to confirm fitment before you buy — same-day shipping available on all in-stock OEM components.