E8
Schumacher
Internal Communication Error Between Control Board and Power Module
Charger shows E8 and does not charge; may occur after a surge or lightning event.
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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
Damaged low-voltage harness between boards, Faulty power module logic interface, Control board firmware corruption, Surge damage to communication circuitry
How to Fix / Troubleshooting
Safety first: Turn OFF the charger at the breaker before removing any covers. Internal components carry hazardous voltages.
- Power reset: Turn the breaker OFF for 5 minutes, then ON. Sometimes a full power reset clears transient communication faults.
- Inspect low-voltage connectors: If you are qualified and the design allows, remove the front cover and check ribbon cables or plug-in harnesses between the main control board and the power module. Reseat connectors firmly.
- Look for surge damage: Check boards for burn marks or cracked components. If present, the affected board must be replaced.
- Firmware update (if supported): Some Schumacher EV chargers can be updated via USB or network. Follow the user manual to apply the latest firmware, which may resolve communication issues.
- If E8 persists: Professional service is required to replace the control board, power module, or harness. Do not continue using the charger until repaired.
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Repair Difficulty
Professional Required
5/5
Required Part
Main Control Board
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