Look, the problem with your machine is related to the water matrix under the left hand side of the casing. When it starts to get clogged up, water level control is affected. Your actions so far have been to disconnect the water valve from the flood protection system, as the clogging increases, the water level control becomes increasingly less reliable and will give the symptons you have described.
The matrix and the valve should be replaced at the earliest opportunity and the machine should not
be used until then. Parts will come to about £80+VAT; if you do not understand how a water hydraulic/air pressure system works I would get professional help as soon as possible.
This is the kind of amateur dabbling that gives the professional repairers the willies........
Whatever you do next, pull the plug first