E20
Schneider Electric
Power-On Self-Test (POST) Failure
Charger shows E20 or self-test failure at startup; unit does not enter ready state.
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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 internal power supply rails, Failed sensor (temperature, current, RCD), Control board hardware fault, Incorrect internal wiring after repair
How to Fix / Troubleshooting
Safety first: Do not bypass self-test protections. Turn off power before inspection.
- Observe startup sequence: Note any LED patterns or display messages during boot and compare with the EVlink manual to identify which test is failing.
- Check for recent changes: If components were recently replaced or wiring modified, re-check all connections against the Schneider wiring diagram.
- Visual inspection: With power OFF, inspect the control board and modules for obvious damage, loose connectors, or missing jumpers.
- Power cycle: Restore power once and see if the fault repeats. Do not continue cycling if the same error persists.
- Professional diagnostics: A Schneider Electric–authorized technician should run detailed diagnostics, measure internal voltages, and replace the faulty module or control board.
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Repair Difficulty
Professional Required
5/5
Required Part
Schneider EVlink control board
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