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Why do washing machines have windows?

Solutons:


In a washing machine the objects that are being washed move around. It’s a dynamic process, that is unpredictable and always unique. Watching the movement is fun, it indeed gives a sense of control to the user, even if it is not actually required. Quite a few people even find it relaxing to watch the washing machine.
The window also prevents users from trying to open the door when the machine is filled with water.

In addition, it might be useful to some people to actually see what is being washed. If I come home, and see that the washing machine is packed with white fabric, I know I can wear my favorite white shirt soon.

In a dishwasher the items don’t move. Making a window in the dishwasher would not expose anything interesting to watch at all. Given the working principle of a dishwasher (same water being reused as much as possible), watching his internal process might actually give you a bad appetite and convince you from hand-washing the dishes.
A dish washer also does not fill the whole machine with water. It actually uses very little water. Opening the door while this machine is filled with water would not result in water pouring out of the machine.

Another argument not to have a windows in the dish washer: a benefit of having a dish washer is that you can just put any dirty dish, cup or whatever straight into the machine, thus making the kitchen look more tidy. If you would have a window in the dishwasher you would be looking at dirty dishes again for 90% of the time.

On the other hand, dish washers with a window DO exist.
enter image description here

Electrolux brought this machine to the market after “market research”, but it appears to have been removed from their current product range.

In the event of a stopped dishwasher (due to electrical fault or buggy software or something) the water in the device streams out of ordinary drains inside, and the water sprayers stop adding more water. If you were to open it after it had shorted out, you aren’t going to get soaked.

That’s not true of a front-load washing machine. If one of these is forcibly stopped at certain points in its cycle, then it remains full of damp clothes resting in soapy water.

Opening one of these without knowing what’s inside would lead to a rather unpleasant surprise.

The window helps you see what’s going on inside in the one case when you do need to interact with it mid-cycle: when it’s broken.

Just looked up the answer, and quite a few places seem to have the same thought.

In front load washing machines, the window is given to see what is
going on inside. In the top loader machine, you can open it at any
time even when the machine is on wash mode but you cannot do so in
front load machine, for the water will spill if you open the window on
the washing mode. Otherwise, windows do not provide any other
functional leverage to washing machines.

Quoted from http://www.why.do/why-do-washing-machines-have-windows/

Which actually does make sense. Since you can’t see what’s going on with your clothes from opening it, you need a window to be able to see.

As well as @Indofrasier answer, you can see if things are caught in it, if the cycle stopped for whatever reason, or if there’s mechanical issues.

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