E501
Bosch
User Interface / Display Communication Fault
Bosch EV charger shows E501 and the display or LEDs do not behave normally.
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Safety Warning
This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.
If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.
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Possible Causes
Loose ribbon cable between display and main PCB, Failed LED/display board, Moisture ingress at front panel, Firmware mismatch between UI and main board
How to Fix / Troubleshooting
Safety first: Turn OFF the breaker before removing any front covers.
- Observe behavior: Note whether the charger still charges the vehicle despite the display error. If charging works, the fault is likely limited to the UI.
- Check for condensation: Look for fogging or moisture under the front lens. If present, allow the unit to dry and improve weather protection if installed outdoors.
- Power reset: Turn OFF the breaker for 5 minutes, then ON. Temporary UI communication glitches can clear.
- Service inspection: A technician can open the front panel, reseat the ribbon cable between the display/LED board and main PCB, and replace the UI board if necessary.
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Repair Difficulty
Medium
3/5
Required Part
Display / LED User Interface Board
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