Display shows E104 and charging stops or never starts; unit may briefly power the vehicle then shut down.

Safety first: Turn OFF the breaker before inspecting wiring or cable. Overcurrent conditions can overheat wiring.

• Check circuit rating: Confirm the Bosch charger’s maximum current setting (e.g., 30A, 40A, 50A) matches the breaker and wire size installed. A 40A charger must be on at least a 50A circuit with appropriately sized copper conductors.
• Verify configuration: If your model supports dip-switch or app-based current setting, ensure it is not set higher than the circuit rating. Reduce the setting and test again.
• Inspect cable for damage: Look for crushed, cut, or severely kinked sections of the output cable that could cause partial shorts. Do not use the charger if damage is found.
• Test with another EV: If possible, test with a different vehicle to rule out a vehicle-side onboard charger fault drawing abnormal current.
• Service if persistent: If E104 persists with correct wiring and settings, the internal current sensor (Hall-effect sensor or shunt) or main control board may be defective and should be replaced by a technician.