Jura Capresso Impressa F9 'malfunction 8' fit without dismantle
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.
Has anyone advice on how to reassemble a Jura Brewing Unit correctly? Any tips for getting it right?
The brewing unit is the central part with a large gear. Many Jura machines (and some other brands like AEG; Krups) share the exact same brewing engine).
I hope this Jura F90 dismantling guide may offer some clues for your E-series machine
Before you start remind yourself of the risks. In case of a mess up, below I've listed a firm selling spares in Europe. In the UK it is assumed that it you can afford the BMW of coffee machines, you can afford to fix and service it too. However I haven't tried any of the UK firms so they, and yours could be really, really helpful and cheap.
You will need a various torx; hexagonal and possibly unique screwdriver bits to remove all screws. A plastic pry tool (used for mobile phones) will help where plastic lugs hold on the side and top panel.
Empty beans; water store and remove the waste tray. On the Jura F90 use pliers to undo two oval headed screws at the back at the top. You'll be able to remove the top panel after using a pry tool to disconnect two lugs at the front edge.
You don't want to dismantle the coffee grinder and its hopper. Retain the hopper's rubber seals or glue them in place before you lose them as I did. Four screws hold the central back panel. Slide out a white key underneath the machine (can't recall how crucial this was).
The side panels are removed by using a pry tool to release lugs all down the edge where these panels meet the front. Work slowly to manoeuvre the side panels off. If you simply want to clean the brewing unit externally then just remove the panel on the water side.
Find the water inlet just where the water tank sits. A screw here allows you to remove a plastic piece - but take a photo of how it slots in. This gives access to the lower end of the brewing unit. If the plastic piece is still it the way, you can ease off the water pipe from the water inlet and put it aside.
A number of different brands are made by one firm and branded. Thus the guts of these machines are similar. The brewing unit in the Jura F90 is almost identical in many machines. The screws and attachment places are different. The water inlet and valve are different. Cleaning the parts you can now see may fix a Malfunction 8 without removing and dismantling the brewing unit. The machine is partly operable in this state - cover the exposed electrical connections and remind yourself of the danger here. Thus you can switch off the power when the brewing unit's white wheel is at the top and then at the bottom. In this way you will get access to places causing any jam. You might just need to clear the inner chamber and path for two plungers with two large O-rings. You can see the water inlet nozzle with its o-ring which can perish and cause coffee or water to go to waste. Silicone grease only where the O-rings slide. Leave the other plastic parts ungreased. As I said you might get away with not disassembling the brewing unit. You can however buy a maintenance kit or a new brewing unit from the shop below.
You will want to avoid removing the nylon water pipes - unless they're actually leaking. These pipes are held in place with a wire clip (remove with a flat head screwdriver). Ease the nylon pipe with its brass collar out of its socket. The pipe goes into an O-ring in the pipe's socket - this might fall out.
Removing a brewing unit is like removing a car engine. The link at the shop below has a pdf (Anleitung_Jura_E.pdf) There is no need to force anything. On the Jura F90 the brewing unit is removed by undoing two obscure screws from the coffee grinder side. I had difficulty removing these and I wish I had taken time to find the right tool instead of wearing down the screwhead.
On the electronic side there's an optosensor (encoder) unit held in place with a steel clip. You might remove this to access one of the two screws. At the bottom of the brewing unit, the water inlet valve is fixed to the machine with a single screw. Next, on the water tank side, you'll see two lines of screws that hold the assembly in place. The middle screws of the screws allow you to separate the unit from the gears. The top two holes don't have screws.
Coffee machine spare part supplies are not as common in the UK as they are in mainland Europe. You'll find this web useful because of the pictures: www.kaffeemaschinendoctor.de is a German web shop for machine spares AND there's a pictorial of how to dismantle the Jura F90 as a pdf. Google will almost translate it). Juradoctor.de also carry lots of spares but don't seem to ship to my country.
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