Sounds exactly like a heavy case of calcium buildup. Most likely you need to flush the machine with vinegar for a lot of times (10x) and use proper cleaning methods to clean it up by hand. However, i think it's faster to bring it to a repair service and pay 100 dollars.
SOURCE: Krups Nespresso FNA2 coffe/cappucino machine
First thing to try is a descale. Run the machine normally using it (as if making a cup of both types) a couple of times with a 50/50 mix of white vinegar and water. Leave the machine off but uncleaned overnight. run a couple of cycles with just water, and if there is still a slight vinegar taste then run a cycle with a teaspoon of baking soda in water, then flush with just water again. If this doesn't solve the problem, try again with 75% vinegar. If still not working, there is either a control board problem (may be solveable), or the valve/solenoid that stops/allows the water is sticking, almost certainly solveable by taking that apart and cleaning/lubricating. Definitely solveable by replacement. Let me know what you get after a descale if no luck. Hope this helps :)
SOURCE: My xp7240 has also started leaking water from beneath the machine
It seems like a piston sealig is damaged. Not so easy to replace but possible.
SOURCE: Saeco Odea Go - Hot water leaks from bottom of machine
That's leaking from the hoses coming out from the boiler,if the machine is new it should be still under warranty, may have to take it back to the service center.When making coffee the lines are under pressure and the water never have a chance to pass through the ground coffee.
SOURCE: No espresso coming out.
The problem with the XP4050 is the two safety valves that the water goes trough on its way to the coffee head. They are plastic and some of the parts will just become brittle because of the hot water and the contamination they gather. With my XP4050 they just broke and parts of it were in the rubber tubes that go to the waste tank.They are also very cheaply constructed compared to the more robust parts of this machine. The water to the hot water/steam head does not have these valves and has a completely different routing. I am currently trying to fix the machine with just one valve and parts of the two valves that are still good. Fingers crossed....
SOURCE: Seeking a 'Steam Build Up Plug' for the Krups 963A
As o ftoday, I have one new and one used one listed on Ebay. They are EXTREMELY hard to find. See them here: http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=280588853641&ssPageName=STRK:MESOX:IT
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