E18
Stihl
Keypad / User Interface Fault
Display shows E18; unit will not accept commands from the keypad
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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 membrane keypad, loose keypad ribbon cable, liquid ingress under keypad, failed UI PCB
How to Fix / Troubleshooting
Safety: Unplug the cleaner before opening the control panel.
- Dry the panel: If detergent or water has spilled on the control area, gently dry the surface and allow time for internal moisture to evaporate.
- Reseat ribbon cable: Remove the control panel cover and disconnect/reconnect the keypad ribbon cable to the UI or main PCB.
- Check for corrosion: Inspect the keypad connector and surrounding PCB for green/white corrosion. Clean with isopropyl alcohol and a soft brush.
- Test buttons: If some buttons work and others do not, the membrane keypad itself is likely failing and should be replaced as a complete overlay assembly.
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Repair Difficulty
Medium
3/5
Required Part
Membrane Keypad Assembly
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