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AEG | Help and Support

Dishwasher displays error message C3 or AL4

The C3 or AL4 error messages indicate a leak and water accumulating at the bottom of the appliance.

Turn off the dishwasher's water supply to prevent flooding.

Drainage problem

The drainage system may also be causing the problem.

  • When using some types of siphon lock with the drain nozzle with the dishwasher in a low position, various problems may occur due to dirty water flowing back into the dishwasher, such as overflowing, error messages appearing on the panel, poor washing or drying results, etc. 
  • It may be necessary to replace the siphon lock in order to get the dishwasher to work optimally.

Correct Drainage:

  • The drain hose is connected to the vented part of the siphon trap.
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Incorrect drainage:

  • The drain hose is connected to the non-vented part of the siphon trap.

If the above suggestions did not solve the problem, we recommend requesting a visit by a service engineer.



To help you determine the exact nature of the problem, we recommend a visit by one of our authorized engineers to check the appliance and fix the problem.

When contacting us, please have the following information to hand. You will find this information on the manufacturer’s data plate:

  1. Model number
  2. Product number (PNC)
  3. ELC number
  4. Serial number

Data plate with model number, product number/PNC, ELC and serial number:

  1. Model number
  2. Product number (PNC)
  3. ELC number
  4. Serial number

[3–9999] Where will I find the data plate on my product? 

NOTE: Depending on the problem, you may be charged for a service visit by an engineer, even during the warranty period.

Make a note of the reported error code and quote it when you request an engineer. This will not solve your problem, but it will help our engineer identify the cause of the problem.

  • Report error code: CU

Warning: We do not recommend using the product until the problem has been completely fixed. Unplug the product and do not plug it in again until you are certain that it is OK to do so.

You can request a visit by one of our engineers by clicking on the link below.