La San Marco 95 Series, Руководство по эксплуатации и обслуживанию

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ENGLISH
F O R T H E U S E R
14 A whistling noise is heard
after coffee has been de-
livered • Malfunction of the expansion
valve
• Pump pressure too high
• Replace the seal and the spring in the valve and reset it to
12 bar
• Reset the pump
15 The filter cup detaches
itself while coffee is being
delivered • Faulty seal under the filter cup • Replace the seal and carefully clean the seats of the three
attaching points on the filter cup and unit by inserting and
detaching the filter cup several times, cleaning it each time
16 While coffee is being de-
livered, some spills out,
dripping from the edge of
the filter cup • Poor seal between the filter cup
seal and the filter cup
• Filter cup seal worn: replace it
• Filters flattened by tapping on hard surfaces: replace
17 Water leaking from the unit
solenoid valve discharge • Malfunction of the solenoid valve
• For machines with temperature
stabilisation, poor seal between
the cooling tube and its O-ring
• Check that the solenoid valve piston is free to move correct-
ly inside the rod and that there are no impurities present:
clean or replace
• Check the O-ring inside the cooling chamber and replace if
necessary
18 Water dripping from the
tea tap • Tap washer worn
• If manual tap, the adjusting
screw needs adjusting
• If electronic dispensing, solenoid
valve leaking
• As for the steam tap
• Check the solenoid valve and replace if necessary
19 Light coloured cream (the
coffee comes out of the
spout fast) • Coffee ground too coarse
• Weak pressing
• Insufficient batch
• Water temperature below 90°C
• Pump pressure higher than 9 bar
• Sprinklers blocked
• Filter holes enlarged • Grind coffee finer
• Increase the pressing force
• Increase the batch dispensed
• Increase boiler pressure
• Reduce pump pressure
• Check and clean with blind filter
• Check and replace
20 Dark coloured cream (the
coffee drips out of the
spout) • Coffee ground too fine
• Excessive pressing
• Batch too large
• Water temperature higher than
90°C
• Pump pressure less than 9 bar
• Sprinklers blocked
• Filter and filter holder clogged
• Grind coffee coarser
• Reduce the pressing force
• Reduce the batch amounts
• Reduce boiler pressure
• Increase pump pressure
• Check and clean with blind filter
• Check and clean
21 Coffee grounds in the cup • Coffee ground too finely
• Grinders worn
• Pump pressure higher than 9 bar
• Filter holes enlarged
• Sprinklers blocked • Grind more coarsely
• Replace the grinders
• Reduce pump pressure
• Check or replace
• Clean or replace
22 Coffee with little cream (comes
out of the spout in spurts) • Filter cup holes blocked • Clean
23 Coffee dripping over edge
of filter cup • Filter cup delivery hole blocked
• Poor sealing of the filter cup seal • Clean
• Replace
24 Depressions in the coffee
grounds in the filter cup • Sprinklers partially blocked • Clean or replace and check filters with relevant dose
25 Cream does not last long • Prolonged extraction due to
blocked filter
• Fast extraction due to blocked
sprinklers
• Water temperature too high
• Clean or replace the filter
• Clean or replace the sprinklers
• Reduce the boiler pressure
PROBLEM CAUSE SOLUTION