E20
EO Charging
Input Overvoltage Protection Trip
Charger shows E20; app may indicate overvoltage protection trip.
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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
Utility supply voltage above EO charger limit, Incorrect tap or transformer setting feeding charger, Faulty voltage sensing circuit, Transient surge event
How to Fix / Troubleshooting
Safety first: Overvoltage can damage equipment. Only qualified electricians should measure and correct supply issues.
- Measure supply voltage: At the EO input, measure line‑to‑neutral and line‑to‑line voltages and compare with EO specifications.
- Check for temporary events: If E20 occurred during a known grid disturbance, clear the fault by power cycling the charger after the grid stabilizes.
- Investigate persistent overvoltage: If voltages remain high, consult your utility or adjust any local transformer taps (by qualified personnel only).
- Inspect PCB sensing: If supply is within limits but E20 persists, the voltage sensing circuit on the PCB may be faulty and require replacement.
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Repair Difficulty
Professional Required
5/5
Required Part
EO main control PCB
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