Just watched some utube vids of the Rainbow and I can see what you mean about the seperator, its like a small drum that is located on the underside of the motor section, with the vertical slits as you say. I'd imagine this spins very fast and throws any water away from entering the motor fan.
I would think that the Gisowatt may not use this technology, but if it does, then it would be possible for water to enter the motor fan if the seperator had fallen off or got lost somehow.
If it doesnt use a seperator, then it could have a missing or damaged baffle?
It would help if Catgate could post some pics of the internals of his cleaner so we could learn how the Gisowatt is supposed to keep the water splashes away from the motor fan inlet.
There's not a lot else I can suggest until we get more info on this cleaner.
Here's what the rainbow seperator looks like - the view is of the upper part of the cleaner from the bottom, with the tank removed. The seperator is in the centre and its spinning action keeps the water from entering the fan.
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