E9
EcoSmart
User Interface / Display Board Communication Fault
Display shows E9; unit may not respond to temperature adjustments or may shut down.
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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 ribbon cable between display and main board, Failed display/control keypad board, Moisture intrusion into front panel, Control board communication driver fault
How to Fix / Troubleshooting
Safety: Turn OFF power at the breaker before removing the front cover or display panel.
- Check display connections: Remove the front cover or display bezel to access the user interface board. Reseat the ribbon cable or harness connecting it to the main control board.
- Inspect for moisture: Look for condensation, water streaks, or corrosion on the display PCB. If moisture is present, dry the area thoroughly and correct any source of leaks or high humidity.
- Visual inspection: Check the display board for cracked solder joints, burned components, or physical damage.
- Test after reseating: Restore power and see if the E9 code clears and the buttons/knob respond normally.
- Replace UI board if needed: If E9 persists and the main board appears normal, replace the user interface/display board assembly.
- Escalation: If a new UI board does not resolve E9, the main control board communication circuitry may be defective and require replacement.
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Repair Difficulty
Medium
3/5
Required Part
User Interface / Display Board
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