E17
AEG
Descaling Sensor / Water Hardness Detection Fault
E17 error; machine indicates descaling or water hardness sensor fault and may not start brewing.
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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
Faulty conductivity sensor in water circuit, Incorrect descaling cycle completion, Heavy scale on sensor surfaces, Damaged sensor wiring
How to Fix / Troubleshooting
Safety: Unplug the appliance before internal work.
- Run descaling: If possible, run a full descaling program using an AEG-approved descaler and follow on-screen instructions carefully.
- Reset descaling indicator: After descaling, follow the user manual to reset the descaling counter or water hardness setting.
- Clean sensor area: If the machine uses a conductivity sensor in the tank or hydraulic block, clean the sensor surfaces with a soft brush and descaling solution.
- Inspect wiring: Check the sensor’s connector and wiring harness for corrosion or breaks. Repair or replace as needed.
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Repair Difficulty
Medium
3/5
Required Part
Water Conductivity / Descaling Sensor
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