Seems simplistic, but check all the programme settings. Some of them have varying amounts of water.
davidj
September 2011
Probably the water pressure switch, It checks water level by pressure in the pipe, You would need to take the top off, it looks like a 3" disk, about 1.5" thick, couple of wires and a pipe, usually situated to the front of m/c usually brown plastic, with metal. Remove pipe and clean, can get blocked with soap.
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Try fixfault.com to fix washing machines.