It is not always requried to do this. The brew unit sometimes gets stuck. All...
Malfunction 8 is related to the brew unit typically. It is usually an indication of the brew unit motor having to work too hard to move the brew unit up and down. The mechanism for dumping grounds becomes stuck from coffee grounds not properly waste out. This is usually cured by disassembling, cleaning all the coffee remains behind group, replacing any o'rings that may be bad, and lubricating the unit, then reassembly.
Also some coffee might be on the opt sensor that senses the up/down position of the brewing unit which when it's switched on the mechanism is not synchronizing and it will go all up or all down and show Malfunction 8.
Here is how to fix it without completely dismantle the machine:
Unplug, remove the water tank, pull out the bucket and tray, and allow to cool if necessary. Now - smaller fingers are better - reach into the machine, palm up. Feel as far back as you can, then work your way forward, toward yourself.
As you move toward you will feel a flat area about an inch wide (measuring front to back). Just back of this (away from yourself), you'll feel a crack about 3/8" to 1/2" wide. Push your fingers up into this area and feel around. You will probably feel stuff that feels like light, chunky rocks these are dry “coffee ground”. Break these up and they should fall out.
Again, small fingers are better and if yours are not once you got an idea of what you are doing, you can described it to someone with small ones and can do it. There is a tendency to not feel far enough back in the machine, so be sure to find the flat place at the lowest point of the mechanism then go just past it and up to find the crack.
Pulled out all compressed coffee “coffee grounds” you can fill. You can also get about a foot of plumber's tape (the metal stuff with holes in it that's useful for just about everything) bent it with a 4" radius, and worked it up into the crack to break up any stuff you couldn't reach. Work at this until no more stuff is in there. Now, tilt the machine toward you and "pat" firmly all over to jog anything left into the crack area, and check for chucks again. You can use a vacuum cleaner with slim tube so you can remove as much as possible with it also.
When that's done, put everything back together, move the machine to where you can work from the top. Don't start it up. Get a flashlight and the vacuum cleaner with the slim tube. Open the top "pre-ground" door and S**K everything out.
Now start up the machine, watch how the mechanism works, now, and try to brew some coffee. While it's actually squeezing out the coffee, tap some more on the "closed" mechanism to free up any more stuck coffee. Do this whole procedure 3-4 times to be sure, I suggest don't drink any of the first coffee it brews. Anyway, the machine should run good as new.
Good luck and please comment as to whether it works for you and vote for it.
on Oct 31, 2010 | Jura Capresso Impressa F9 Espresso Machine