I have a 3 year old Rancilio Silvia espresso machine that is tripping my GFI. This was a machine we had overseas for 2 years and then was in storage for 6 months or so before we were able to get it. In my excitement to have it back here in the States, I filled it with water and plugged it in, and turned it on without priming it. About 5 minutes after turning it on, I heard the GFI trip . After a few minutes, I realized what I had done!
The other day, I was able to check the solenoid and it does not seem to be stuck. I was also able to remove the leads from the boiler heating element and I was able to turn on the machine and prime it. However, it tripped when I put the leads back on the heating elements and tried to heat the water. Last night, after calling Wholelattalove where I bought the machine, I removed the boiler. They indicated that a failed heating element would likely be obvious. Unfortunately, when I removed the boiler, I could see no signs of a failure. There were no cracks or pieces missing. The element and most of the inside of the boiler seemed to be blackened, but most of this did not come off when I tried to clean it, so I don't know if this is just a normal color change or an indication of a problem. I also put an ohm meter across the terminals of the heating element and got 18 ohms. I would think this might indicate that the heating element is okay? If so, I must have some other problem!
Are you able to test constant current? If you are dealing with a faulty element then you should hear the beep go on and off with a multi meter. You want a constant beeping noise when testing the current.
Assuming that you tried with a different GFCI as well
assuming that when you open it there was nothing leaking on electrical components
assuming that the HE doesn't have a serious build up of scale,
Is possible that you have a pin hole on the coil
I see a lot of Silvia HE that looks perfect and yet they are dispersing to the boiler/water once installed, one of the the easy way to test that is: with the machine assembled and water in the boiler ether remove the ground wire from the bolt connector or one of the HE wires, if no GFCI tripping, and once you reconnect it does trip the HE COULD be the problem take and ohm reading between one of the terminal and the boiler in each of them,
other possibility, less commune but possible the brew thermostat
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