christokes87 Junior Member Joined: 25 Sep 2013 Posts: 2 Expertise: I love coffee
Posted Wed Sep 25, 2013, 5:22am Subject: Gaggia Classic won't push water through the portafilter?
I've had a Gaggia Classic for a little over a year and the machine has run great. I use it in conjunction with a Iberital grinder that I bought from Happy Donkey and it's been producing some good espresso. However...
A couple of days ago a went to brew a shot and the machine couldn't 'push' the water through the coffee in the portafilter, and I've been having the issue ever since. I'm certain it's not the coffee as I've tried everything, including reducing the dose, making the granules coarser and not tamping so hard, but nothing's working. The machine doesn't seem to have to pressure to push the water through the coffee.
I've given the machine a good backflushing with Urnex Full Circle, but it hasn't made an ounce of difference. The only thing I haven't done is a descale, but I don't live in an overly hard water area, and I've almost always used bottled water or britta filtered water.
Anyone know what the issue is or had the same problem? All help would be much appreciated as I'm struggling without my morning latte!
D4F Senior Member Joined: 15 Mar 2012 Posts: 1,676 Location: USA Expertise: I like coffee
Espresso: Gaggia Classic PID Grinder: Preciso
Posted Wed Sep 25, 2013, 8:58am Subject: Re: Gaggia Classic won't push water through the portafilter?
Minor point, but with the PF off there is not much back pressure and flow is about 10 ml/sec at no back pressure. If you open the wand and use no PF and collect the flow from both for 10 - 15 seconds, you should approach 10 ml/sec. That shows that the volume output is ok, but not necessarily against pressure.
If flow is good, then try a half dose of usual and see if that really obstructs flow. If so, then you may need to measure pressure. Search OPV and pressure and you will find a variety of ways to measure pressure by a gauge to the PF. A start
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