Our Vienna, Superautomatica leaks water from underneath

This is an easy fix for a 14$. The seal at the water tank connection is worn. Take the water tank off. There is a round flat topped plastic retainer. Pry off the retainer (comes off easily). You will see a black round o-ring made to fit on a channel. Remove the o-ring and replace.Two minutes and you are without water leaks. I do not remove the tank to fill anymore, I use a pitcher instead. Part number 3 in this diagram.
http://www.partsguru.com/user/VIENNA%20PLUS%20DIAGRAM.pdf

Change Wanter inlet Seal:
Part #NM05.006

The o-rings of the water tube coming out of the boiler need to be changed. Rubber O-ring tend to expand after extended exposure to heat.

There are many possible points that the leak can be.

All points of the water supply from water tank to the pressure pump then to boiler and finally to coffee group. All this are connected together with plastic or Teflon pipes with easy fit unions secure with clips

You need to disassemble the machine and work it without the side panels of course with extra care since power electrical cables are exposed.

In this way with a very good visual check while the machine is in operation you can identify the leaking point and fix it.

Is it leaking only when brewing coffee ?

If not I would check the seal under the water tank (Part #NM05.006)

If so, I would check the following:

1- The water input port on the back of the brew unit (looks like a smoke pipe) might be clogged

2- The o-ring of the water tubes coming in and out of the boiler.

Check the little chamber under the white plastic valve behind the brew unit, that might be blocked with coffee.

Hi
The magnet tells the machine that the water is low so you don't run the pump dry and cause it to fail. Some Vienna Supers had them and some didn't.

water puddling underneath machine indicates a broken boiler.

Machine needs to be sent in to have the boiler replaced.

Do not continue to use the machine because the seal on the boiler which is broke can end up splashing the electronic board and rendering your machine a paper weight.

i had the same problem what i suggest to you clean where the water tank were its sit very good put the tank back me i never remove the water tank i clean regualy i put the tank empty on the machine and fill it with a glass never leak again pierre

We had this problem and it was overflow from a clog -- check the hole where excess water drains into the drip tray to see if it is full of grounds. Cleaned it out with a twistie tie and flushed w/ water. That stopped the water on our counter!