Does anyone know why a machine like this would stop working after descaling ? I used a typical due descaling powder twice now. Each time, the pressure release on the PortaFilter stopped working (in other words you could hear the pump working, water going in, but then nothing coming through the Pf. It sounds similar to if you try to use coffee that's ground too fine). Both times I've replaced the PF. The first time was at a shop so it worked I.e. They also cleaned the thing. This time I bought a new PF online, but even when it's empty the problem persists. Not enough pressure? Blockage upstream?
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