E29
Walli
Low‑Voltage Power Supply Fault
Walli charger displays E29; app shows 'Internal power supply error'.
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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
Failed internal SMPS on Walli main board, Short on low‑voltage rail from peripheral module, Surge damage to power supply components, Loose connector between PSU and logic board
How to Fix / Troubleshooting
Safety first: Internal power supply faults can be hazardous. Only qualified technicians should service internal electronics.
Steps:
- Power cycle: Turn off the breaker for several minutes, then restore power and observe if the charger boots normally.
- Check for smell or heat: If there is a burnt smell or excessive heat from the Walli housing, leave it powered off and do not attempt further use.
- Internal inspection (technician): With power disconnected, open the unit and inspect the PSU area for bulging capacitors, burn marks, or cracked components.
- Module isolation: Disconnect non‑essential modules (Wi‑Fi, RFID, display) and see if the PSU stabilizes when powered (technician only).
- Replace PSU/main board: If the internal PSU is unstable or damaged, replace the Walli main control board or dedicated PSU module as per design.
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Repair Difficulty
Professional Required
5/5
Required Part
Walli internal power supply module
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