Chapter 4 Fault diagnosis
106 SMSO-2-02.04- 15.07.03
Wet coffee grounds
System / component Possible cause Remedy
Grinder
Grinding degree too coarse (outlet time
too short, brewing pressure too low)
Adjust grinding degree (see “Mainte-
nance, Setting the Grinding Degree”)
Grinding degree too fine (outlet time too
long, brewing pressure too high)
Adjust grinding degree (see “Mainte-
nance, Setting the Grinding Degree”)
Instant heater Brewing water temperature set too low Adjust brewing temperature setting;
optimum temperature: approx 86 – max.
90
o
C at outlet (see programming in-
structions)
Brewing valve / flush valve 3/2 way brewing valve or flush valve is
clogged (pay special attention to the dis-
charge outlet)
clean or replace
3/2 way or 2/2 way brewing valve is not
water-tight; water runs continuously into
the brewing unit.
replace
The hoses between the brewing unit and
the brewing valve or flush valve and its
outlet hoses are kinked or clogged
clean or replace
The re-press time is not programmed Reset the re-press time and make the
correct setting (see “programming in-
structions, product button”)
Re-press pressure too low Adjust the re-press time setting (see
“programming instructions, product but-
ton”)
Safety valve Opening pressure too high (only for
brewing systems with 3/2 way brewing
valve)
replace
Brewing unit
Lower piston
Lower piston dirty (also water entering
brewing cylinder)
clean or replace
Outlet piston Outlet piston (micro filter or baffle in
outlet tube) dirty
clean or replace
Piston motor Compaction pressure too low (brewing
pressure too low)
Adjust compaction pressure (see pro-
gramming instructions)
Over-pressure in instant heater
System / component Possible cause Remedy
Electrical faults
Power PCB / power relay
Power PCB, power relay defective (con-
tacts bonded, and thus no longer switch
off)
check and replace the power PCB or
power relay (see “control system dia-
gram, heating for instant heater coffee”)
Temperature sensor Temperature sensor defective or calci-
fied
clean or replace and carry out checks
(see “control system diagram, tempera-
ture sensor coffee”)
Unit control system defective replace (see “Maintenance, unit control
system”)
Load machine data (counter and set-
tings) to new unit control system
Programming
Instant heater
Temperature incorrectly programmed Correct the programming (see pro-
gramming instructions and “Technical
Data, standard settings”)
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