OEM Carrier Transformer 40VA 120V to 24V for Model C48A202064

This is the factory OEM replacement transformer (part number HT01BD702) for the Carrier C48A202064 packaged unit. The transformer steps down line voltage from 120V to the 24V signal required by the control board, thermostat, and all low-voltage system controls. When the transformer fails, the entire control circuit goes dead — your thermostat will show no response, the system won't call for heating or cooling, and nothing will operate despite power being present at the unit.

• Specs: Input: 120V AC | Output: 24V AC | VA Rating: 40VA | OEM Part Number: HT01BD702 | Class 2 transformer, factory-matched to Carrier C48A202064 specifications
• OEM vs Generic: This OEM unit is wound to exact factory tolerances, ensuring stable 24V output under full load. Generic transformers often drop voltage under peak demand, causing nuisance lockouts and intermittent control board faults that are difficult to diagnose.
• Install Difficulty: 2/5 — Disconnect all power before servicing. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter (to confirm 24V output after install). Label or photograph all low-voltage wiring connections before disconnecting. A blown transformer may indicate a downstream short — always inspect wiring before replacement.
• Warranty: 1-year OEM factory warranty against defects. In stock and ships same business day from our warehouse.

Compatibility: Designed for the Carrier C48A202064 packaged unit. Verify your existing transformer's input/output voltage and VA rating against your unit's data plate before ordering. If your control fuse repeatedly blows, inspect low-voltage wiring for shorts prior to installing the new transformer. Our team is available to confirm fitment — order today and receive same-day shipping.