E20
Amperfied
Auxiliary Power Supply Failure
Display shows E20; charger indicates ‘internal power supply error’ and is partially or completely unresponsive.
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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
Defective low‑voltage power supply module, Blown internal fuse on control supply, Short circuit on control board, Surge damage to PSU
How to Fix / Troubleshooting
Safety: Internal power supplies are connected to mains; only qualified technicians should service them.
- Check external power: Confirm that the upstream breaker is on and that other devices on the same circuit have power.
- Observe LEDs: If any status LEDs on the charger are dim or flickering, note this for the technician.
- Do not repeatedly reset: If the unit cycles on and off, leave it powered down to avoid further damage.
- Technician repair: A technician should open the unit, check internal fuses, measure the low‑voltage rails, and replace the auxiliary power supply module or main control board as required.
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Repair Difficulty
Professional Required
5/5
Required Part
Auxiliary Power Supply Module
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