E20
EvoCharge
Load Management / Master-Slave Communication Fault
Charger shows E20; may indicate load-sharing or group communication error in multi-charger setups.
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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
Disconnected RS-485 or CAN bus cable between EvoCharge units, Incorrect master/slave configuration, Termination resistor missing or duplicated, Failed load management controller module
How to Fix / Troubleshooting
Safety first: Communication wiring is low-voltage, but chargers should be powered OFF before changing wiring.
- 1. Verify network topology: Check that EvoCharge units in a group are wired according to the load management diagram (daisy-chain, correct polarity).
- 2. Check terminations: Ensure that only the end devices on the RS-485/CAN bus have termination resistors enabled, as specified by EvoCharge.
- 3. Confirm roles: In the configuration menus, verify that one unit is set as master and others as slaves, with unique addresses.
- 4. Inspect communication cables: Look for damage, loose connectors, or reversed polarity on the communication pair.
- 5. Replace controller module: If a dedicated load management controller is used and E20 persists, that module may be defective and require replacement.
Until communication is restored, chargers may revert to standalone operation or reduced current limits.
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Repair Difficulty
Medium
3/5
Required Part
Load Management Communication Module
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