Post By timmyjj21
Post By Dimal
Post By jbrewster
Post By CafeLotta
VBM Junior, water is staying in the group head after brewing
When I pull down the handle after making a coffee no water comes out of the pipe leading into the drip tray. Instead it just seems to stay in the portafilter/group head. However the pressure is obviously going somewhere as there's no issues when I detach the filter.
I've recently had the machine repaired (which took three months as the repair person was really busy then waiting for parts). I mentioned to them prior about water not coming out of the bottom pipe but I don't think they understood what I meant (I live in the country, the person that repaired it does all the commercial machines but I don't think has a lot of knowledge with HX machines).
I'm wondering if this is something I should rush back to get fixed i.e. is this in any way damaging to the machine? If it isn't can I still back flush with chemicals to clean it?
E61 Group Servicing - Coffeetime
My go-to guide on E61
I'm not an expert on this, but if the pressure isn't released out the waste pipe then the only other place is back into the heat exchanger? If you have a sticky cam, the mechanism for pump activity and water flow may be out of sync or not functioning. I would not be back flushing without knowing where it is actually going.
Something that the repairer really should have noticed!
Sounds to me like the Valve Ass'y has been incorrectly assembled...
I'd definitely refer it back to the vendor who 'repaired' it for you.
I also just realised it no longer does a pre-infusion. I have no idea what he's done to it but now once you raise the lever it jumps straight up to 9 bar. I might take it back in and have a chat with him. I'll also need to find a video so I can show him how it's meant to work (both the pre-infusion and the water venting).
That's really weird, the way preinfusion works on an E61 is basically that there's a cavity (I suppose it'd be considered an accumulator in hydraulic terms) in the water path that fills with water initially, this "bleed path" reduces the pressure to the puck, until the cavity is full of water (an incompressible fluid) which allows the full pump pressure to be seen at the puck. So the only way I can think that it would not do that is if the passage that leads into that "cavity" is blocked.
It's entirely possible I'm off base here though, my brain is rather fuzzy at the moment (it's a 5 shots of espresso kind of day, and I've had 5 shots but things do not seem to be improving...)
Bumping this thread to add some hopefully useful info. Recently I bought a set of 3 new valves for a VBM E61 group. When compared to the valves I was replacing, the new "Infusion" (middle) valve was found to be around 6mm too short. Apparently most E61 type groups utilise the same length "Brew" (top) and "Drain" (bottom) valves but there seems to be 2 different length "Infusion" valves available. If you install the shorter one in the VBM group it is still activated by the cam when the Lever is turned downward but there is a gap between the "Drain" valve and the "Infusion" valve. This means the "Drain" valve isn't activated by the "Infusion" valve as would normally occurr. It is possible this is the issue "Quomby" originally posted about but unfortunately has not followed up with a resolution post.
As far as being supplied the wrong "Infusion" valve, the retailer I purchased from sold/serviced both VBM and Giotto machines and it seems I was given a Giotto "Infusion" valve. They look the same except for the 6mm difference in length between the 2 manufacturers. Easy mistake to make I suppose if in a hurry or distracted.
Last edited by CafeLotta; 5th January 2018 at 10:04 PM.
Reason: Correct error in details