E20
Sharp
Main Control Board Communication / Internal Error
Dishwasher displays E20 and may not start or may stop unexpectedly; often associated with general electronics fault.
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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
Corrupted control board firmware, Internal relay failure, Power surge damage, Loose connectors on control board
How to Fix / Troubleshooting
Safety first: Turn off power at the breaker before opening any panels.
- Power reset: Disconnect power for at least 5 minutes to allow the control board to reset. Restore power and try a short cycle.
- Inspect control board: Remove the control panel or side panel to access the Sharp main PCB. Check for burnt components, corrosion, or loose connectors.
- Check supply voltage: Ensure the outlet or wiring provides stable voltage and that there are no signs of overheating at the terminal block.
- Professional service: If E20 persists and visible damage is present, the control board likely needs replacement or reprogramming by a Sharp-authorized technician.
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Repair Difficulty
Professional Required
5/5
Required Part
Main Control Board
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