E05
Walli
Input Undervoltage / Brownout Detection
Walli charger intermittently stops charging with E05; app log shows 'Undervoltage' or 'Low supply'.
Advertisements
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.
Advertisements
Possible Causes
Weak or overloaded supply circuit feeding Walli, Loose line or neutral at Walli terminal block, Undersized supply cable causing voltage drop, Faulty input voltage sensor on Walli control board
How to Fix / Troubleshooting
Safety first: Repeated undervoltage can overheat wiring and damage equipment. Investigate promptly.
Steps:
- Check breaker and cable rating: Confirm the Walli charger is on a dedicated circuit with the correct breaker and cable size as specified in the installation manual.
- Inspect terminals: With power off, open the Walli and verify all line and neutral terminals are tight and free of discoloration or melting.
- Load test: Have an electrician measure voltage at the Walli input while the charger is delivering current (or attempting to). Significant drop (e.g., below 207 V on a 230 V system) indicates supply issues.
- Reduce current setting: In the Walli app or DIP switch configuration, temporarily lower the maximum charging current and see if E05 events stop. This can confirm a supply limitation.
- If supply is stable but E05 continues: The undervoltage detection circuit on the Walli control board may be faulty and require board replacement.
Advertisements
Repair Difficulty
Hard
4/5
Required Part
Walli main control board
Check Price on Amazon
We may earn a commission from links on this page.
Advertisements