Ok may have an issue.
I pulled the lever to flush some water through the group as I’d changed pid temp and noticed that this time the pressure built up on the display (not the group pressure gauge, that stayed at zero)? Eventually building up to around 9bar, this while using daveCs program of 18s 2bar PI then 10bar. Bear in mind this was without a portafilter in position.
My memory is a little unclear, but I don’t think this happened in the past?
I still get flow through the group, can pull espresso fine etc. I pulled the top nut and upper assembly from the group and all is clear. I activated the pump with the top assembly out and water filled the chamber.
I don’t recall pressure building up previously? Shouldn’t this be reading system pressure, so without a PF there shouldn’t be any? Or is this reading directly off the pump? If this is normal I am unsure how I never spotted it before.
If this is not normal, where is my blockage likely to be? Blockage after the pressure sensor but before the group?