Summary of costs to date
Machine new £800
Replace brew unit £80
Replace cracked water tank £12
Replace broken metal frother arm with other small parts £15
Replace thermoblock, I and F connectors and membrane regulator £67
UPDATE 2015: Replaced some parts I should have replaced ages ago
With 16,000 cups now made the leaking from my 2004 Jura F90 was getting serious. I contacted UK Jura spares (below) to replace 'o' rings in numerous connections below the coffee grinder unit. I tried to remove and renew the connections to the thermoblock (heater) but they were so corroded that the heater also needed replacement. Overall the heater and new Teflon connectors cost £67 but nothing leaks anymore. This included the membrane regulator unit after the pump (at the front bottom of the machine) which I heard is notorious for leaking and has been modified.
UPDATE 2014: If the Jura touch panel is unresponsive or erratic
After doing my first Jura service below, the machine would make coffees at random and a mess was the result. The touch screen was also unresponsive at times. This may have been a problem I caused while dismantling but now it's fixed. It works when left to dry. And thanks to a forum post on a German site, it was suggested that steam can get behind the touch panel and the solution was to put plastic film (or card or shirt collar packing) horizontally beneath the panel to isolate it from the steam from the coffee dispensing area. I hope this works for you as it did for me.
UPDATE 2014: service the coffee grinder the easier way
You don't have to take the grinder to tiny pieces to service it. Some videos show you the entire dismantling but that may be unnecessary if you just want it cleaned up like new. On the Jura F90 you'll need to remove the top panel (see first bit of dismantling below). You'll see the coffee bean hopper held in place by two vertical screws. Go at them gently with a torx screwdriver bit else you'll break a fixing point. Note the position of the consumer grinding adjuster. Hoover excess beans. Lift the hopper clear. Clean the central silicone seal. Note the position of the big outer cog wheel which is the grinder adjuster. Turn this anticlockwise and you'll be able to remove the outer grinder wheel and clean up. If you're just wanting to clean it, don't loosen the central grinding wheel. Instead see this video, where the Saeco has a similar grinder. When tightening up the two hopper screws after reassembling, don't over tighten.
See more recent update for a more radical repair. My F90 machine leaked and messed up a wood worktop. Most of the damage was due to emptying the grounds and drip tray. However, there was some leaking from inside. See below the bit about dismantling to remove the side panel (coffee grinder side) and access the pump and tubes. The tubes are plastic and held in place by a wire clip. You may now be able to spot where the leaks are by the scale. It may be enough to remove a wire clip, withdraw the tube and its brass collar. Inside there's a tiny 'o' ring seal to replace. Push the tube and collar back in firmly and add the clip.
The brewing unit can be the cause of Malfunction 8
The Jura Impressa F90 - background
- The 'Empty grounds'; 'Descale' and Clean machine' messages simply derive from counters; the 'Tray Missing' message comes from a microswitch. 'Fill Beans' appears if no coffee powder arrives in the brewing unit - though the sensor is probably in the grinder. The 'Fill water' message is triggered by a microswitch and/or a sensor in the plumbing. What you experience is not entirely spoofed intelligence and works well.
- When you see the message 'Clean machine' you respond by holding the Maint. button until what to do appears on the display. The machine cleaning cycle cleans the brewing unit and coffee outlet only.
- The descaling cycle cleans the boiler; pump; valve; steam nozzle and probably the inlet nozzle at the bottom of the brewing unit. I never use a Claris filter since our water is chlorine-free. When you see the message 'Machine scaled' you respond by removing the water tank and turning the machine on by holding the Maint. button. What you must do to descale the machine appears on the display. I used all sorts of kettle scalers.
What can go wrong in the brewing unit?
The encoding unit could also be at fault. This isn't too expensive.
I'd recommend you read the following with the additional help of Partsguru who have Youtube tutorials https://www.youtube.com/user/PartsGuruUSA
Before you start dismantling remind yourself of the risks. In case of a mess up, below I've listed a firm selling many spares apart from the actual chassis. They'll sell you a complete brewing unit; a pack of O-rings and grease; encoder; water inlet; water pipes. They also sell replacement water tanks; pump; solenoid; valve; grinding wheels; grinder unit; heater. I haven't tried any of the UK servicing firms so they could be really helpful and cheap. Otherwise it takes a few hours to service and replace the brewing unit. However it took a few weeks to understand that I needed a brewing unit.
Cleaning is all
It is not rocket science to clean the machine yourself. Before hovering check for loose parts or screws! Wipe and toothbrush whatever you can see. Don't wet excessively, but a cloth damped with descaling liquids can work wonders. Do wipe the acid off any metal parts when clean.
You can compare prices with a German web shop for machine spares at
www.kaffeemaschinendoctor.de Their postage policy at £15 a time is ridiculous, at least for small items. The upside is that there are pictorial guides to dismantle the Jura as a pdf. Google will translate it. Another site Juradoctor.de also carry lots of spares but don't seem to ship to my country.
In the USA Partsguru have a shop with excellent help on Youtube https://www.youtube.com/user/PartsGuruUSA
A helpful pictorial guide