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17
Checks and maintenance
17.1
Check and maintenance operations
To ensure perfect safety and efficiency of the machine
over time, it is necessary to carry out routine, preventive
and special maintenance. In particular, it is advisable
to carry out an overall check of the machine at least
once a year.
Intervention
MACHINE
Carry out the cleaning as described in the previous
chapter.
FILTERS AND FILTER HOLDERS
Check the condition of the filters. Check for any
damage on the edge of the filters and check wheth-
er any coffee grounds settle in the coffee cup.
MACHINE
Every four months replace the perforated disk (2)
and the undercup seal (4) of the delivery group (use
only original spare parts) proceeding as follows:
1.
loosen the screw (1);
2.
remove the containment ring(3);
3.
replace the group perforated disk (2) and the
rubber undercup seal (4);
4.
reassemble the components
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Intervention
VALVES
Check for proper operation of the negative pres-
sure valve, pressure limiting valve and non-return
drain valve. If, owing to failure, their replacement
becomes necessary, repeat the test with the new
valve installed.
NEGATIVE PRESSURE VALVE
1) first try :
• remove the top grill of the machine;
• use pliers to push the pin (5) downwards;
• if the pin does not move, it probably means the
valve is encrusted with limestone and must be
replaced.
2) second try :
• turn the machine off;
• open the steam valves and drain off
all the pressure from inside the boiler;
• turn the machine back on and check
for regular closure of the valve.
SAFETY OR PRESSURE RELIEF VALVE
1) first try :
• remove the top grill of the machine;
• use pliers to pull the pin (6) upwards;
• if the pin does not move, it probably means the
valve is encrusted with limestone and must be
replaced.
2) second try :
• turn the machine off;
• block the pressure switch
contacts;
• turn the machine back on and
check for pressure in the boiler
to rise.
• check for correct intervention
of the valve at a maximum pressure of 2 bar.
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Technical manual
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