Duravit Foster WC. At intervals of 2-3 weeks, why does it overflow onto the floor?

Is the pan "level" under fridge? If not, it will not hold the amount of drainage that is put out and spill onto the floor.

After you take the sink off there might be bolts to the floor. If not the pedastal is probably just caulked to the floor. Just pull on it and it will break loose.

It may be that the drain cable has come undone or is not attached anymore.
This will require you to get to the backside of the tub around the drain and overflow area to check the problem and resolve it.

Rod
US Parts Center
888-521-6183

The drain in the freezer behind back lower panel
needs opening. You can see it at the bottom of the back panel
underneath the evaporator coils. (The cold coils)
Run Hot water in the drain until it clears or use a hairdryer.
When the defrost melts the water it goes down the drain
If the drain is clogged with Ice or ? The defrost water
overflows into the ref. or freezer or on floor
Run Hot water in the drain until it clears or use a hairdryer.
Also check fan undernearh Ref in the rear
Clean condenser coils underneath
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Change the radiator cap. The spring on yours is getting week. The reason it does it when you shut it off and doesnt do it when its running is cause the water pump sucks the coolant out of the radiator while it is pumping so there is not much pressure on it but when you shut car off the coolant stops curculating and egine heat is not transfered coolant exspands and pushes on the cap. If your spring in the cap is getting week then it pushes it up letting the coolant pass by to your overflow tank.

The push button siphon assembly is worn out. Just replace it entirely.

Hi Mickey, You have a bad water valve. Turn the water off to your unit and turn off the ice maker. Replace your inlet valve.

install a fluidmaster flush valve.

Maybe it is because of increased humidity inside the fridge. This could be caused by the door not being properly closed or leaking.

Maybe your machine has a leaky door, letting moist air inside. Make sure your compressor area is lint free. The heat from the compressor is supposed to evaporate that water. Make sure the pan is exactly in the right place, level, not cracked.