Cleaning The Suction Valve - MSW Motor Technics MSW-ES-1010 Bedienungsanleitung

c) Turn the machine on with the ON/OFF switch and if all the "TSL" oil is
sucked out of the container, turn it off immediately. Wipe the unit
clean of the ejected oil.

3.4.8 Cleaning the suction valve

Cleaning the suction valve may be necessary if the unit is having trouble
cleaning itself and getting rid of debris. To do this, you need to:
a) Remove the suction hose from the valve.