The EF4 error code on an AEG washing machine is typically related to the machine's water supply. Follow these steps to resolve the issue:
1. Check the inlet hose for any kinks or blockages that could be restricting water flow.
2. Verify that the water supply valve is fully open. If not, turn it counterclockwise to open it.
3. Inspect the inlet filters on the machine. If they're clogged, clean them out.
4. If the problem persists, it could be due to a faulty water valve or pressure switch. In such a case, consider contacting a professional for further assistance.
