Rather than simply copying and pasting yet another version of instructions that already exist to be found, let me ask: When you searched for answers yourself before coming here, did you find any results along these.lines:
https://www.justanswer.com/uk-appliance/5jjh3-miele-washing-machine-model-3725-fault-message-display.html
If so, the explanation is about as simple as it geta
Hjksk, December 2018
