Bosch · Charger
620 Bosch error code 620
Charger fault
Per manufacturer documentation
Note
Bosch classic system (Intuvia/Nyon/Kiox/Purion). Smart System codes differ.
Possible causes
General, component-based causes – not a manufacturer-specific statement.
- Faulty charger or charger cable
- Damaged/corroded charging socket
- BMS charge protection (temperature, cell voltage)
Safe test steps
- Charger open-circuit output vs. its label value.
- Does pack voltage rise while charging (measure after 5–10 min)?
- Charging socket contacts, polarity, mechanical damage.
Workshop reference values
- Li-ion charger final voltage: S × 4.20 V (e.g. 10S → 42.0 V); tolerance typically ±1 %.
- Charging temperature: most Li-ion cells must not be charged below 0 °C (per datasheet).
Repair approach
- Replace the charger with an approved one of the same voltage.
- Replace the charging socket/cable.
Tools needed
- Digital multimeter (CAT III, fused inputs)
- Basic hand tools, insulated screwdrivers
Safety
- Do not charge unattended, near flammables, or a damaged/hot pack.
This information does not replace manufacturer service documentation. Work on batteries and high-voltage parts only with the appropriate expertise.
Related fault codes
410One or more on-board computer buttons are blocked414Connection problem with the control unit418One or more buttons are permanently pressed419Configuration error422Connection problem with the drive unit423Connection problem with the battery424Communication error between components426Internal time-out error