Chapter 4 Fault diagnosis
110 SMSO-2-02.04- 15.07.03
Piston motor malfunction
System / component Possible cause Remedy
Mechanical faults
Piston motor defective replace (see “Maintenance, brewing unit
piston motor”)
Piston motor Piston motor fixing loose Install the piston motor correctly (see
Maintenance, brewing unit piston motor)
“Piston motor timeout” see “Display messages”
Electrical faults
Power PCB
Defect in cabling or in piston motor
Direction of rotation is incorrect: flat plug
on motor transposed
carry out a check (the plugs have differ-
ent dimensions!) (see “control system
diagram, piston motor”)
Position switch Micro switch for initial setting defective
(message on display “motor current”)
Check the function and setting of the
position switch (see Maintenance, re-
place/set micro switch” and “control sys-
tem diagram, limit switch for brewing unit
initial setting)
Programming
Compaction current (compaction pres-
sure) programmed too high
Correct the programming (see pro-
gramming instructions)
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