E9
Thor Kitchen
Communication Error Between Control Board and User Interface
Dishwasher shows E9 and may not start; control panel may be unresponsive or partially functional.
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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
Loose harness between main PCB and control panel, Moisture intrusion into control panel, Failed user interface board, Failed main control board
How to Fix / Troubleshooting
Safety first: Turn off power at the breaker before removing any panels.
Step-by-step checks:
- Power reset: Turn off the breaker for 5 minutes, then restore power to clear transient faults.
- Inspect control panel: Check for signs of moisture, condensation, or detergent residue around the buttons and display. Dry the area with a soft cloth.
- Door panel removal: With power off, remove the inner door screws and carefully separate the inner and outer door to access the control panel and wiring.
- Check harness connections: Ensure all connectors between the user interface and main control board are fully seated and free of corrosion.
- Reassemble and test: Reinstall the door, restore power, and test operation. If E9 returns, one of the boards may be defective and require replacement.
Warning: Avoid pulling on wires directly; always handle by the connector housings.
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Repair Difficulty
Hard
4/5
Required Part
Main Control Board
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