Coffee will not expel.

SOURCE: My Miele CVA620 machine announces 'Expel Air,' and

I'm probably to late for this answer, but I will share it anyway.
I got this problem after buying a used CVA620, that had not been used for a while.
To solve the problem i used a breast pump :-)
My wife had this doublepump after the last kid. And I used the hoses that comes with this unit (rubber-like) and connecting them to the hot-water and the steam-nozzles. I started pumping, and pushed the hotwaterbutton. After 5min of pumping and swearing, the job was done. No my CVA works as a charm again :-)

espressonist

• 1711 Answers
• Posted on Jul 24, 2011

SOURCE: my miele cva 615 the

The oils in this mud cake dry up right after the water dries up (over night) and presto you have concrete! This concrete becomes too thick to clean, so cleaning with tablets has to increase dramatically if you increase the strength of the coffee. If you leave it strong clean it weekly.
Normally you clean the brew unit with cleaning tablets every time you finish descaling. That's about once every 200-250 coffees based on the water hardness you set in the electronics. If you notice changes in the coffee water flow speed it's usually from clogging.

If you're handy get your camera. Take pictures of every step you do. Remove the brew unit. Disassemble the left top section (2 screws holding the long pipe). It compresses a 1/2" long spring. It may get away from you so be ready for it. The spring attached to a half round plastic button (valve) that looks like a rivet. Clean all brown gunk from this valve and the housing and you're cr?me will return. While you're in the cleaning mode remove the filter and clean inside under the filter. The filter is that round stainless steel screen disc with the phillips head screw in the centre.
All this is evidence that cleaning needs to be stepped up, good luck!