WMF Kaffevollautomat reinigung

WMF Kaffevollautomat auf Veranstaltung ... Unterweisung zur Reinigung.

[@eddoukhalihicham992]

Hello Now The machine displays wmf ag v boot manager 9.1 And before the machine displays, a descaling and also maintenance message 2 and after the machine displays error 157, and when I changed the lithium battery, the machine does not start anymore and displays, wmf ag v boot manager 9.1. Please how i can solve this problem? And thank you in advance.