La San Marco 20/20 CLASSIC Serie Emploi Et Entretien page 49

DEFECT
9. Autolevel alarm.
10. Overfill alarm.
11. The machine is on (main
switch in position 1 or
2 and the indicator light
is on) but the electronic
control is out of service.
12. The machine delivers
water from a brewing
group even if no coffee
dose buttons have been
selected.
13. The steam wand drips
slightly, even when in the
closed position.
14. The hot water spout
drips slightly, even if in
the closed position.
15. The unit whistles after
brewing a coffee.
48
CAUSE
water circuit.
is closed.
valve is defective.
malfunction, the filling solenoid
is always open.
faulty.
electronic board or touch panel
is defective.
panel are defective.
and/or pump are powered
continuously.
adjusted.
adjusted.
SOLUTION
valve is open.
must inspect the automatic level
water circuit and check the operation
of the solenoid, and replace it if
necessary.
must check the correct operation of
the filling solenoid, the electronics
controlling the automatic level and
any faults in the manual filling valve.
must check the electrical wiring
of the electronic board and touch
panel. Check the operation of the
electronic board and touch panel and
replace any defective components if
necessary.
must check the electronic board and
the touch panel. Check the operation
of the electronic board and touch
panel and replace any defective
components if necessary.
must check the gasket and replace if
necessary or adjust the steam valve.
must check the gasket and replace
if necessary, or adjust the hot water
valve.
if necessary. Calibrate the valve to 12
bar.
must check the pump operating
pressure. Calibrate the pump to 9 bar.