In article , BigWallop
wrote:
It sounds as though you have the three wires to the water level switch in
the wrong places then.

Don't think so, I was careful to mark them and replace as found. The common
is permanently connected to the neutral side. One disconnects this from the
misbehaving solenoid tap when the fill level is reached and in the same
action the other connects to the emptying pump via some sort of resistor
thingy that looks like a watch battery. But it continues to fill. :-(