E27
Walli
Auxiliary Output Overload / Short Circuit
Walli charger displays E27; app shows 'Overload on auxiliary output' on models with auxiliary relay outputs.
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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
Shorted external device connected to Walli aux relay, Overcurrent on 12 V/24 V auxiliary supply, Miswired external control circuit, Faulty aux driver on Walli board
How to Fix / Troubleshooting
Safety first: Auxiliary circuits are usually low voltage but can still cause damage or fire if shorted.
Steps:
- Disconnect external devices: Remove all wiring from the Walli auxiliary output terminals.
- Reset and test: Power cycle the charger and check if E27 clears with no external load connected.
- Inspect external wiring: Check the cables and devices previously connected to the aux output for shorts or incorrect wiring.
- Reconnect carefully: Reconnect external devices one at a time, verifying polarity and load limits specified in the Walli manual.
- If E27 persists with no load: The auxiliary output driver on the Walli main control board is likely damaged and the board should be replaced.
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Repair Difficulty
Medium
3/5
Required Part
Walli auxiliary output driver
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