The EF6 error code on an AEG washing machine indicates a problem with the machine not being able to heat up the water. This could be due to a faulty heating element or a problem with the circuit that powers it. Here's how you can fix it:
1. Unplug the washing machine from the power source.
2. Access the heating element located at the bottom of the machine. Refer to your user manual on how to do this.
3. Check if there are any visible signs of damage or wear on the heating element. If there is, you'll need to replace it.
4. If there's no visible damage, you can use a multimeter to check the heating element for continuity. If there's no continuity, it should be replaced.
5. If the heating element is fine, check the wiring and the circuit that powers it. Look for any loose connections or damaged wires.
6. If you're unable to identify or fix the problem, it's best to contact a professional or AEG's customer service for further assistance.