Posted Tue Mar 4, 2014, 12:51pm Subject: Silvia boiler seems to be cycling very quickly. Unstable water temps?
Three months ago I was given a free, second-hand older generation Silvia (built 2004, I believe.). I've been playing with it periodically, mostly on weekends, and figured out a routine to get some pretty good shots out of it. I used a styrofoam cup and instant thermometer to figure out that using the "flush and go" technique for temperature surfing as described my Mark Prince in this video, (http://www.youtube.com/watch?v=QhxvDusY3jk), I need to count to "7 one thousand" to hit a water temp of 200 - 201.
In the past couple of days, however, I've noticed that the boiler seems to be cycling really fast. Pretty much as soon as I'm done my cooling flush, the boiler light clicks on before I even have time to lock in the portafilter. It also doesn't stay on for as long as it used to: I got into a routine where if I flushed water through the group head to trigger the boiler cycle while I was grinding, the light would click off pretty much exactly as I was finishing my tamp and ready to pull my shot. Now, it clicks off way before I'm finished prepping the basket.
What reasons might be causing the boiler to cycle so fast? Is it likely that my water temps are less stable as a result? The last few shots I pulled tasted pretty bright using 49th Parallel's Old School blend, which should have relatively low acidity.
I should mention that I recently went about 3 weeks without using the machine at all. After that, I flushed about 2 litres of water through the machine to make sure all the stale water was out of the system.
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