The E3 error code signifies a heating issue, specifically that there is continuous heating. This means the washing machine is detecting constant heat even when it shouldn't be heating the water. You should inspect the heater’s control board relay, but this is something that should only be done by an expert

This error code indicates that there is a problem with the heater meaning that the machine is unable to heat water properly. This is most likely a wiring issue, which you may be able to resolve with the help of the instruction manual. 

However, I would recommend enlisting the help of an expert.

The E1 error code indicates a heating issue with the NTC thermistor wiring being the major culprit. This component is crucial for regulating water temperature within the machine. 

You can check the thermistor to test the connection on Beko washing machines. At normal functioning, it should register 4700 ohms at 25°C