Hi
I have a La Marzocco fb/70 running at home and I have a very simple question that I never knew. Now I have a problem :(
Question:
know that shots are best at 9 bar. Should the machine idle at 9 bar, or only go up to 9 bar when pulling a shot?
Problem:
edit: The below problem seems to have mysteriously resolved itself. A pump motor electrical gremlin I suppose. I'll leave the original question below if anyone is curious.
I'm getting tempted to replace the pump motor. The one it came with says "wega" on it. Is it worth getting a LM one or are motors/pumps pretty much generic?
Below is the resolved problem:
When I got the machine (2nd hand) it idled at 9 bar but went up to about 12 bar while brewing which is when the pressure valve kicks in. Since then I've had repeated problems with the motor/pump shorting out the power in my house. Each time it's solved simply by letting it dry out in the sun. The problem may just be moisture since it's in my garage and raining non-stop.
In the last few days it's been idling at 6 bar and going to 9 bar during when pulling a shot. the pump turns on while pulling the shot. About a third of the time though it will idle at 6 bar and when pulling a shot the pump wont turn on and the pressure will keep going down (I usually shut it off at 2 bar). I does this randomly across the 3 groups.
2 things happed between when it was working and now:
- The pump had another big short-out
- I attempted to remove the group cap on the middle group (3 group machine). I only got as far as removing part 18 here before deciding to put it back together, but to remove that I had to completely bleed the middle group (completely took off the bleed screw)
Can anyone help? ..please? Stressing
thanks
Hugo
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