E401
Bosch
External Control / Load Management Fault
Bosch EV charger shows E401 and stops charging shortly after start; may coincide with utility demand response features.
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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
Incorrect wiring of external load control input, Faulty demand response module, Misconfigured utility control signal, Shorted control terminals
How to Fix / Troubleshooting
Safety first: Turn OFF power before accessing any low-voltage control terminals.
- Check for external control wiring: If your Bosch charger is connected to a home energy management system or utility control relay, inspect that wiring for loose or shorted conductors (electrician recommended).
- Disable external control: Temporarily disconnect or disable the external load control input per Bosch instructions and test if the charger operates normally.
- Verify configuration: In the app or installer menu, ensure load management settings match the actual installation (single charger vs. multiple chargers, correct current limits).
- Consult utility/installer: If the charger is part of a utility program, contact the program administrator to verify that control signals are correct.
- Module replacement: Persistent E401 with correct wiring may indicate a failed load management/demand response module that needs replacement.
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Repair Difficulty
Medium
3/5
Required Part
Load Management / Demand Response Module
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