My BDB this coming April would be two years old, no issue, have been a very happy owner. The last few weeks I've been using it daily instead of only on weekends. Now the machine starts to run 40 seconds on empty pull when the double shot button is pushed (double shot single wall PF with NO coffee), I have a setting of 7 seconds pre-infusion. With ground coffee (Vario-W using 3 day roasted coffee in Behmor), depending on the grind, it will vary between 45-50 seconds with pressure showing 5-7 bars. With finer grind it will be 48-55 seconds with pressure at the end of the grey area (10 bar?). While the time won't lies, the pressure gauge seemed to be acting strangely. It never does this before: the pressure needle stays in the pre-infusion during pre-infusion and then very slowly moves, I'm talking about a few seconds at least, it used to stay in pre-infusion and then shot up to the grey area (8-10 bar?). No matter how I varied my grind and/or tamp, it seems to either be less than 7 (outside the grey area) or over 10 (end of grey area). While you can blame my skills, how is it possible empty pull runs 40 seconds? I believe it used to do that under 20 seconds in the past, even with pre-infusion.
I suspect it's a weak pump. But since finer grinds and also using the rubber thingy (blind pull?) on double wall PF would result in the gauge at 10 bar, I don't know what to make of this. Another possibility is caulking, supply of water is not enough, that's why empty pull runs so long. Anybody with this experience before? I've checked coffeesnobs, but didn't find anything relevant, I don't think it's the o-ring.
I would never discourage one to seek service through the channels Breville intends for us, (which also seems to result in new or refurb machines), but I can tell you for certain that the o-rings in the /A are super easy to inspect and replace. Yes the /B now sports a gasket with molded-in o-rings, but the old method with traditional o-rings and no gasket, is an entirely workable situation when we are all off warranty and doing what we can for ourselves. all complex machines need attention sooner or later, despite Breville's best attempts to make ours as trouble-free as possible.
In fact, if you have a /A that is over a year old, I strongly recommend you inspect under the 3-way solenoid, and clean the base where the solenoid sits. and replace the o-rings too if they need it.
And having the /B is not all sunshine and roses. The rim of the group head is fatter and deeper. I had to grind a notch into the handle of my beautiful naked portafilter, where it meets the ring, to make it fit the new group head. That combined with the fact that there is no increased functionality going from /A to /B and IMHO there should be no mad rush to swap out your /A for a /B.
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