Hello,
It sounds very much like there is a blockage in the drain pump,when was the last time you checked the filter.It may be spinning ok but if the filter is blocked it may not be spinning fully or draining properly.There is also a good chance that the sump pipe and drain pipes are choked with sludge /limescale.Try the filter check first if no Joy then it will need investigating down by the pump.
Hope this is of some help.
Good Luck.
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