Rio 3-Group - Pressure low on one group

[tjcarothers]

Hello,
I am having issues with one of the groups on our 2000 Rio SME 3 group machine. All three groups have functioned perfectly until recently, when one head suddenly seemed to have pressure issues. Pump pressure is solid 9 bars, and boilure pressure is good at 1.o-1.5. Group 2 and 3, numbered from left to right, pull perfect shots. However, #1 seems low on pressure, given all variables the same (grind, tamping pressure, etc).

Any help as to where to start checking things would be appreciated.


TJ.

 

[CoffeeJunky]

seal problem to me.

 

[tjcarothers]

Hi CoffeeJunky,
A seal where? Metering valve? Solenoid? Expansion valve?

TJ.