Linea AV/2 - Made in 2002
Last weekend, I turned the machine on and let it come up to temp. When I started pulling shots, I could tell right away something wasn't right. Started checking, and water coming out of the group wasn't nearly hot enough, and the groupheads were much cooler than I expected.
Took off the cover and was looking around and found a button on top of one of the groupheads was popped up. Pressed this in and saw that the boiler light was now on and I was gaining pressure.
Pressure continued to build, past the 9 bar mark it usually stabilizes at. Running some water through the groups would bring it back down, but then it would climb again.
Was pulling some shots, and when running a flush noticed steam was coming from the groupheads - finally popping the button on top of the grouphead again. Shut it down and started reading.
I really haven't found much on line speaking to this trouble specifically, although I suspect it is a thermostat failing - I really know very little about the insides of these machines and was hoping some of the gurus here would chime in.
I really think that I would like to install a PID to control brew temps if I am going to have to replace parts anyway. Does anyone have an idea on how to do this on a La Marzocco? Have some parts laying around they are looking to sell? I have seen the kits for sale on line, and know I can do it for quite a bit less with a little bit of information on what to source.
I think I need to go ahead and buy the "Orange Book" since there doesn't seem to be a soft copy of it out there either...
-Stubbie