This may be caused by the on-site installation or because the cross-section of the water supply pipe is too small.
If in doubt, contact a suitably qualified plumber. The noise will not affect the functioning of the dishwasher in any way.
Knocking noises can be heard in the water supply pipe.
If in doubt, contact a suitably qualified plumber. The noise will not affect the functioning of the dishwasher in any way.