Chapter 4 Fault diagnosis
102 SMSO-2-02.04- 15.07.03
Coffee running slowly / irregularly
System / component Possible cause Remedy
Rotary-vane type pump Defective
Pump pressure setting incorrect
replace
adjust to 7.0 – 7.5 bar
Flowmeter / non-return valve Nozzle in flowmeter
Baffle behind the non-return valve
clean / replace flowmeter
clean / replace
Supply pipe of instant heater inlet holes dirty (calcium deposits) clean / replace
Instant heater Loose calcium particles rinse out, replace if calcium deposits are
heavy.
Brewing valve Dirty
Does not open fully
clean
clean / replace
Brewing pipe Injector nozzle dirty (calcium, coffee
grease)
clean / replace
Booster
Coffee outlet
slow, dripping
Booster clogged
Coffee grease, deposits)
clean / replace
Booster – brew unit pipe Pipe clogged (coffee grease)
Pipe bend (mounted incorrectly)
replace
replace; mount correctly with clamp
Brewing unit
Plug connector on lower piston
O ring defective or missing
replace
Lower piston clogged Coffee grounds too wet Adjust the re-press setting (see standard
settings)
Lower piston O-ring defective replace
Outlet piston Micro filter clogged (a baffle of approx.
0.6mm is built into the outlet piston)
O-ring defective
replace
replace
Tube connection on outlet piston O-ring defective or missing replace
Coffee powder Ground too fine
Incorrect dosing (too much / too little)
Set grinding degree
For decaffeinated coffee: Use powder of
the correct grinding degree
If the ground coffee is uneven, check the
grinder blades in the grinder(s), if worn:
replace the grinding blades
Adjust the grinding quantity setting
For decaffeinated coffee: Make the cor-
rect dosing manually (if necessary use
another suitable measuring spoon)
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