C3 does mean aqua control has responded.
Could be : drain pump faulty, main electronic faulty
Check leakage in appliance, float switch, drain pump, wiring and main electronic.
Dado
Http://www.aeg.co.uk/Support/Troubleshooter/?Command=Detail&CatId=98&SymptomId=1412&DetailId=1412shows AEG's meaning for a C3 error code
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