Milk foam problems

I have a similar problem to so many with most Melittas or Mieles. I have actually tried all the possibilities. The outlet valve is new, as is the drainage valve, the outlet has been dismantled and cleaned, the ceramic valve looks like new inside, I have replaced the seal, the ceramic discs have been given PTFE lubrication and the air valve is free. Everything runs fabulously, but there's no foam... wink.gif
My problem seems to lie in the control of the ceramic valve. When the foam draw starts, it looks good for 3 or 4 seconds. Then you hear the valve motor start up again briefly and from then on the foam is gone, it just sprays. Does anyone here have any ideas?
Greetings from Hamburg

Hi, it could be that the microswitch is not working properly.
This is pure conjecture.

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