Recently ALL the lights have started flashing on my WF540 when I first turn it on. Initially when I left it for about 10 seconds they would stop flashing and I could use the machine. But this time has now increased to about 20 minutes (although I can then use the machine). I have found various diagnoses online for combinations of lights flashing, but not all at the same time - any ideas? I have tried turning it off at the mains for an hour and back on, but as soon as I press the'on' button it happens again.
Thanks
Thanks