The manual does not mention a pump that sprinkles water on the clothes.
I have been able to use the washer since without noise and have been unplugging the power when not in use.
However, when the washer is not in use, I have noticed a couple of times that the noise starts when using the hot tap in the kitchen and stops when turned off. But it does not happen everytime.
So I assume it is something to do with the plumbing.
I will try cleaning the water inlet filters.
Hopefully the noise will not return.