Thanks so much for this suggestion! We unscrewed all the parts and soaked them in the descaling solution (also from Urnex), and that solved the problem. We do have a machine detergent as well, but it seemed like a descaling solution would do a better job for how everything looked like. I'll make sure to backflush with the cafiza detergent a bit more often. I've been backflushing with water (once after each shot and 3 time at the end of the day) to avoid having to use the detergent, but it seems I should use it once a month as you suggest.
Thanks again! Best, Dunja On Monday, 8 November 2021 at 22:12:36 UTC+1 [email protected] wrote: > Ok I just have a guess. Something that will do you no harm to check... > > First, do you own some cafiza? Some sort of coffee machine detergent? Its > terrific stuff. You should periodically disassemble and boil group head > parts in it. 20 minutes boiled in cafiza you'll be shocked how much tarry > grunge is removed. > > You really should be back flushing with cafiza every month or so. I'd do > that first, chances are it'll clean out the clogged tar. > > But if machine is really gummed up you probably should take it all apart > and clean it. Much more time efficient. > > Your picture shows the component that I suspect is jammed with tar. In > your picture #10 is the main body of the group head. There's a bolt on top > that screws in, there's another big brass tube thing that bolts onto the > bottom of it, its the bottom thing that can get really gummed up. Unplug > machine, let it cool, then use a wrapped wrench to undo both of these. Try > and remember the parts assembly order, they go together in a very specific > way. Pay particular attention to the orientation of short and long > plungers, the springs, etc. They're all different. > > Take all those parts out and boil in caffiza, if its really packed you > might need to boil 2-3 times and scrape the tar off. Once everything is > clean reassemble. I like to use some food safe lube on threads when > reassembling, otherwise it can gall. > > There's really no need to take machine in for this, the cleaning and > assembly are really simple. Youve done 99% of the work just finding the > parts diagram. > On Monday, October 25, 2021 at 5:20:08 AM UTC-7 Dunja wrote: > >> Hi all, >> >> Our Expobar Brewtus IV (10 years old) has started having issues with >> flushing out the remaining water after each shot. The amount of water that >> comes out of the exhaust pipe (if that's the name?) is relatively small, >> and instead the puck is a wet mess. >> >> We had the same issue a few years ago (after a while, no water was being >> flushed out, while the pressure remained in the portafilter attached to the >> group head), so took it for repair and a part had to be replaced (the price >> of that whole enterprise was 300 EUR). If possible, we'd like to fix it >> ourselves this time around. We already once opened the group head to clean >> it, so I was wondering if we could just replace some parts. >> >> In view of this, would any of you maybe know which part(s) could be >> malfunctioning (and if this is a relatively common problem, would it be >> worth it already ordering the relevant parts out of these >> <https://www.avola-coffeesystems.de/expobar/expobar-bruehgruppe-ex0201/8038732?#9> >> ?) >> >> In addition, water has recently started dripping from the group head when >> the pump is off, so I assume some seals need to be replaced anyway. >> >> Any help much appreciated. >> >> All the best, >> >> Dunja >> > -- You received this message because you are subscribed to the Google Groups "Brewtus" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To view this discussion on the web visit https://groups.google.com/d/msgid/brewtus/7d68c6d0-fcb6-4fc9-9bda-9a91dacb0f52n%40googlegroups.com.
