SOURCE: jura capresso
If you gind too fine, it will overload the pump and result in the "open tap" a few seconds into brew. Rinse and gind coarser to clear out malfunction.
SOURCE: my jura capresso says system fill...it makes a lot of noise
System fill is usually when the machine auto solenoid fill valve is putting water into the boiler. If it is making noise then the solenoid is clogged or there is no water getting to the solenoid.
SOURCE: Tray empty message
If the machine says TRAY MISSING it's the contacts at the back so clean as other people have stated, you can also use a cardboard nail file to clean the contacts at the back if there really skanky!.
If the machine keeps saying EMPTY GROUNDS even though you have, pull out the tray, look just inside the aparture where the tray goes top right at the front there is a small slot where if you look closely you can see a small white micro switch. This will be probably gunged up with coffee and the switch will be stuck up, get a can of WD40 and squirt a small amount up into the switch then poke the switch with a small screwdriver up and down until it moves smoothly.
Then replace all the bits, sit down, look smug and have a coffee cos you've fixed it!! :0)
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