@martin7020 The grinder should run for about five to seven seconds, does it? If so, I would open the grinder and clean it thoroughly. This guide helps.
Hallo VauWeh, that is the problem is don't run 7 seconds but only 3 seconds, i have the same machine in my home en that runs for 9 seconds and that gives a good cup off coffee. Result is that I need to extend the time of the mill and I don't know how to do that.
@martin7020 This is really strange, maybe an electronic fault... I never saw an issue like this, sorry. Difficult to say, perhaps I would replace the motherboard. Prize is about 50€.
I had this problem, it's due to the timer relay forgetting how much time it needs to grind.
The only way to solve it is with half a kilogram of coffee going to waste,
You set the coffee amount MAX and set the coffee size to MIN clean the trays for water and grindied coffee and start making around 20 coffees one after the other immediately get your phones timer, and measure each time you make coffee how much time it takes to grind you will start from 5 seconds probably, eventually after the 20th coffee it will be 7, and do it until you reach from 11-12 seconds, hope this helps you, it helped me.
I have the same problem. Short grind then refusal to make coffee then red light on signifying that used grind bin full. The grind bin is actually empty