Problem with Hjälpsam dishwasher

I had the same problem. The cause was ultimately a huge amount of dirt in the tub where the outlet to the water level sensor is connected. There is a small slot in the tub, and from the outside a gray hose is connected to it. I took cotton swabs and thoroughly cleaned this small slot from the inside. Now the device runs smoothly again.

And this is what I learned: regularly clean the dishwasher. There are already plenty of products available on the market for that!