Pump works against resistance

Hello all,

my Melitta Caffeo CI no longer spits out coffee. Both when rinsing and drawing a coffee, it sounds like the pump is working against a resistance. Hot water can be drawn normally.

What I have tried or replaced so far
:1. brewing unit revised2
. Drainage valve replaced3
. Coffee spout cleaned or without inserted coffee spout the error pattern is the sameSo right now

I'm at a loss as to what else I can do

.

Do you have any ideas?

Thanks already once!

Hello, it could be that was not properly decalcified with decalcifier on amidosulfonic acid.
Or the ceramic valve is and or.... calcified, defective.

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I would guess the outlet valve. Remove it, disassemble it and clean it. If that does not help, replace it