Hello, got me my 3rd Caffeo CI. She has only 5000 covers. Unfortunately, it shows the error "System Start" when preparing milk foam, which means according to Melitta: Air in the system, .... please vent, which the machine then also makes with pressure on the Rotary Switch. With the next milk foam, however, the same problem. I have now opened the machine - it really still looks top - leaks are not immediately visible. However, when foaming, you can see air bubbles forming in the hose. What could be the cause of this? Which part would have to be replaced?
Would be grateful for tips! VG
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