Can you post the full model number please.
Ok is the washer full of water still or has it drained the water out?
And if you try and start a cycle will the door lock so you cannot open it?
Ok when you was in test mode by turning the dial to cottons 90 pressing the start button did the test cycle work?
Could you get it to fill and the motor turn during this mode?
Ok then what you need to do is pull the washer out and lean it backwards against a wall and look under the washer and there you will see the back of the motor. There either side are the carbon brushes. Take them out and see if they have worn down. If so then you need to replace them.
As the start light flashing is saying theres something wrong with the washer its not a case of just resetting it you need to find the cause of this. So check the brushes in the motor and see what you find. Fingers crossed this may be worn brushes in there.
Let me know what you find and we can take it from there.
Ok they are low but not low enough to stop the motor from running
If you have a multi meter you can test across the armature going from one brush to the other and see if that's all ok and the motor armature is fine.
If this is the case then is possibley a fault on the control board. Now im afraid this isn't an uncommon fault on these Bekos. Ive replaced loads of these over the years. But im afraid they are quite expensive and to be honest not worth it on a Beko as this is an older model. Its not that old but these washer don't last long im afraid.
Sorry its not looking like good news but if you need anymore info just get back to me.