E18
Cillit
Configuration / Parameter Fault
E18 error and the unit indicates sensor calibration or configuration error
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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
Incorrect parameter entry, Corrupted configuration memory, Incompatible firmware for model, Unauthorized service menu changes
How to Fix / Troubleshooting
Safety: No hydraulic work is required, but disconnect power if removing covers.
- Review settings: Enter the installer or service menu (per Cillit manual) and verify all parameters: resin volume, meter size, hardness, regeneration type, and valve model.
- Restore defaults: Use the factory reset function to restore default configuration, then re‑enter site‑specific values.
- Firmware compatibility: Ensure that any replacement PCB or display module is the correct version for your specific Cillit softener model.
- Persistent errors: If E18 returns immediately after correct configuration, the Cillit main control PCB may have a firmware or memory defect and should be replaced.
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Repair Difficulty
Medium
3/5
Required Part
Cillit main control PCB
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