I have a 16cup mchn - using it for 16 years now. For some time now there is steam/water leaking from the group when you heat the machine. This probably is some sort of seal or gasket problem but i dont know how to fix it. Steam/water also leaks from the frothing attachment.
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Re: water leaking from the group
You can buy a service kit for your machine at www.theespressoshop.co.uk and that contains all replacable gaskets and washers and gives you an exploded diagram and sachet of grease and descaler to get your machine back in as new working order. The service kit you require is the "old group service kit" and is about £20. If you go to the website above and click on the la pavoni machine on the right hand side of the home page it will give you the full parts list.
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You have 2 issues.
Steam wand leaking while making coffee - This indicates that the seals on the steam tap o rings need replacing.
Coffee pouring over the handle when making coffee - this indicates that the group gasket needs replacing.
Replacing the group gasket is easy takes 10 min
Replacing the o rings on the steam tap may take a little longer..
All you need is a group service kit Ascaso gasket kit Dream Arc Basic
You have to take apart the system for changing the gaskets.If you are not a technical savvy don't try for it.Here is the parts diagram for your machine.Many of my fixya customers took apart the system to change the valve and they suffered a lot to fix it again back.All the best.
Boiler end gasket
Gasket for above
Group touch pad
Steam + water valve
Drip tray grill
Pop off valve
Water flow meter
Water level Probe
Auto refill relay effect
Filter basket single
Steam-water valve knob
Heater exchanger injector
Manual refill valve
the gasket look like this.I will cost around 12$.
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This is a result of the water temperature in the boiler increasing, thereby expelling water that may remain in the lines out of their respective exit points. A solution may be to place a container under the group head to catch the water, or opening the steam valve partially to allow the water to exit through the steam wand (again placing a vessel/cup/pitcher there to catch the water). This is a problem that even higher end (dual-boiler) models have, due to the necessary purging of water that accumulates in the steam wand during down-time.
Don't look at it as a problem, but simply as a quirk that single-boiler machines have. If you are still irked by the issue, consider buying an inexpensive manual frother (Bodum makes these) to froth and heat your milk (in the microwave after frothing) separately. An added plus is that you can do this while you make your espresso, so if you make primarily milk-based drinks (latte, capps etc.) you'll save on time.
I HAD the same problem. I fixed it for 50 cents. It takes the removal of 4 screws (2 phillips on top, 2 long standard on bottom by the group) to remove the top to access the steam wand valve. Once the the top (and the chrome bezel) is removed, then screw out the valve counterclockwise buy ALL THE WAY until it comes out. There are 2 O-rings on the stem of the valve that wear out, Cut these off with a sharp knife, go to your local hardware store, buy 2 new ones for 50 cents, install new O-rings, and reverse the disassembly procedure. Voila, no more leaky steam valve!
You will need to take the machine apart completely as there are more gaskets inside the group head. You can buy an old group service kit at www.theespressoshop.co.uk for about £20 and it comes with an exploded diagram so you can see what goes where. Don't worry there is no technical mechanical solenoid like the last comment stated. I repair these machines for a living and all it needs is a good service.
That big nut is the pressure relief valve. It should normally be closed, unless the machine overheats, in which case it will vent the steam, thereby preventing an explosion.
The valve design means that it's somewhat normal for some steam to vent as the machine heats up, but once it gets close to working temperature, it should seal.
Pavoni does now have a replacement valve that avoids this problem. When your machine needs a major service, hopefully more than 5 years from now, you may decide to get the upgraded valve fitted.