B&D ISX23, 2 years old, recently cleaned (with vinegar), still brews slowly, and often brews only part of the 12 cups put into it. We put 12 cups into it, and only get 8 cups out?
I have this problem with a 4 cup model. 4 cups in, 2 cups out. I cleaned it twice with vinegar (with a filter in place). The first time didn't seem to help, but the second time I got about 2.5 cups out, along with a bunch of old grounds that I think had been sucked into the pump. Ran water through it twice, and now it gets to about 3 cups.
I think the problem is just that the pump is clogged with grounds. If vinegar makes yours worse my guess is that a big piece got dislodged and is now blocking the tube. More vinegar might help.
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We have the same problem. Lots of steam, very little coffee, almost no water flow over the grounds. We have cleaned it with vinegar as well and it made the problem worse the second time around -- now no water flow, only steam.
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