My machine is hissing on the left side. The pressure is fine and it is still working well. I took off the top and there is steam coming out of a small valve. It looks like it is a release value. Wh

Hi,
You have to open the machine,take off top half of the machine and you will see near to the pomp a black plastic connection where the hose enters the valve and goes to the brewing group. Most likely it is cracked and the water flows from there. It's cheap to switch, about $ 10, if you do it yourself.

Hopefully, your pressure gauge is working, and if it is at 1.2 bar or so, then you have a failed anti-suction valve or boiler safety valve.
The ASV is the smaller fitting; it might be stuck, so you could try tapping the little button. The boiler safety valve is another matter - it will open at some point past 1.8 bar, which means the pressurestat is shot or its adjustment has been tampered with.



Boiler Safety Valve

It's most likely the ASV - they do get stuck open as well as closed...

Leave the valve open until it starts slowly hissing, then shut off valve and wait for the pressure to build up.

It sounds like you have the cup warmer turned on. But if that's not it there is a leak in a connection coming from the bolier. If you open it up it will be obvious where it's at. Don't wait too long because the moisture will effect the electronics.

loose hose clamps hole in one of the vac lines it seems to only hiss when its under pressure

I had a similar problem. I took the guages out and found the hands were loose on the dials. I fixed them on at gthe low point when the machine was cold and they worked well after that point.

Where is the steam coming from the small valve on the top or the big tall one? If it is the tall one then the problem is in the block electrical box(pressure stat) on the left above the element, that may be stuck and not telling the machine that it has enough pressure turn off the elements.

Could this happen if you fill the bottom chamber over the pressure release valve so that the steam pressure built up and couldn't be released. Or perhaps the pressure release valve got blocked. Not sure. But it is important to take it off the stove promptly when you hear it make that gurgled hissing sound that indicates the top chamber is full and now steam is coming through rather than water.

Hi,

Take off the edge on the steam pipe, clean it and mount it again.

/Mirran

you both can have same problem, solution is:

1. low pressure of pump (or too fone grinded coffee)
2. security valve of boiler openes to early and dont let the pump to rise pressure enough for good brewing( if it is this you can see water returning back to container if you have 2nd pipe in your machines reservoir)