Hi
I have just acquired an old (15-16yrs I have been reliably told) La Pavoni p/tre 2 group machine. This is my first real foray into trying to 'fix one up'.
The right hand group had no flow when I first got it but I removed the top bolt - is this the 'mushroom' ? - and gave the jet and filter a soak in some citric acid. The group now has flow but when I flick the switch off - its a manual switch - there is no purge from the three way solenoid valve. I swapped the coil and the body over with the other group but still the right hand group has the same problem, the left hand group runs fine with either solenoid so I hope I am correctly assuming the problem is not with the solenoid valves but a blockage in the grouphead. It was roughly transported and I am pretty sure there has been some dislodging of scale or the likes.
Looks like I may have to take the group heads off to give them a good clean but before I do that I would like to know what lies behind the 2 bolts on the left side of the grouphead? Please see attached picture. Do I need to undo these to clean it out or are they better left alone? I can't find any parts diagram that show what these do or hide.
With the solenoid valves removed, the water flows out of the rear of two holes on the grouphead. I can't quite get my head around what happens when the valve is attached or what the actual flow path is, where it starts and where it goes before hitting the shower screens. I assume it goes from the rearward hole into the 3way valve then into the front hole of the group head. Which hole does the purge happen through?
Also will the group heads be fine in mild citric acid?
Appreciating your help in advance!!
Thanks
G
I have just acquired an old (15-16yrs I have been reliably told) La Pavoni p/tre 2 group machine. This is my first real foray into trying to 'fix one up'.
The right hand group had no flow when I first got it but I removed the top bolt - is this the 'mushroom' ? - and gave the jet and filter a soak in some citric acid. The group now has flow but when I flick the switch off - its a manual switch - there is no purge from the three way solenoid valve. I swapped the coil and the body over with the other group but still the right hand group has the same problem, the left hand group runs fine with either solenoid so I hope I am correctly assuming the problem is not with the solenoid valves but a blockage in the grouphead. It was roughly transported and I am pretty sure there has been some dislodging of scale or the likes.
Looks like I may have to take the group heads off to give them a good clean but before I do that I would like to know what lies behind the 2 bolts on the left side of the grouphead? Please see attached picture. Do I need to undo these to clean it out or are they better left alone? I can't find any parts diagram that show what these do or hide.
With the solenoid valves removed, the water flows out of the rear of two holes on the grouphead. I can't quite get my head around what happens when the valve is attached or what the actual flow path is, where it starts and where it goes before hitting the shower screens. I assume it goes from the rearward hole into the 3way valve then into the front hole of the group head. Which hole does the purge happen through?
Also will the group heads be fine in mild citric acid?
Appreciating your help in advance!!
Thanks
G

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