SM Duale Class Manuel D'instructions page 35

PROBlEM
6. The programmed servings
of espresso coffee are not
constant or vary on the
different dispensing units.
7. It is not possible to
program the dose
quantities on unit 1 and
to copy them on the other
units.
8. flow meters alarm.
9. Autolevel alarm.
10. The machine is switched
on (the main switch is in
position 1 or 2 and the
signal light is lit) but the
electronic control is out of
order.
11. The machine is dispensing
water from one dispensing
unit although no coffee
dose button has not been
selected.
12. from the steam spout
comes out a small
amounts of water droplets
even if in the closed
position.
13. from the hot water
spout comes out a small
amounts of water droplets
even if in the closed
position.
14. The unit emits a whistle
after dispensing of coffee.
34
CAUsE
• Abnormal operation of the
electronic control unit or of the
flow meters.
• Leakage from solenoid valve of
the dispensing unit.
• Water dispensers clogged.
• Abnormal operation of the
electronic control unit or of the
flow meters.
• Flow meters blocked or failure.
• Electrical wiring defective.
• Water circuit of automatic
level without water.
• Main water supply valve
closed.
• Faulty autolevel solenoid
valve.
• The electrical wiring of the
electronic board or the touch
panel is faulty.
• The electronic board or the
touch panel is faulty.
• Dispensing unit solenoid
valve and/or pump fed
continuously.
• Gasket of the steam valve
worn.
• The valve needs adjustment.
• Gasket of the hot water valve
worn.
• The manually valve needs
adjustment.
• Faulty operation of check
valve.
• High pressure of the pump.
sOlUTiOn
• Program the doses separately on
each dispensing unit.
• The authorized qualified technician
must check and if necessary replace
the flow meter of the group. Check
and if necessary replace the solenoid
valve of the unit. Check the water
dispensers.
• The authorized qualified technician
must check the electrical wiring
between the control unit and flow
meters and see if you need to
replace the flow meters.
• The authorized qualified technician
must check the electrical wiring
between the control unit and flow
meters and see if you need to
replace the flow meters.
• Check that the main water supply
shut-off valve is open.
• The authorized qualified technician
must check the automatic level
hydraulic circuit and verify the
correct operation solenoid valve
and replace if necessary.
• The authorized qualified technician
must check the electrical wiring of
the electronic board and the touch
panel. Check the operation of the
the electronic board and the touch
panel and if necessary replace the
faulty components.
• The authorized qualified technician
must check the electronic board
and the touch panel. Check the
operation of the the electronic
board and the touch panel and
if necessary replace the faulty
components.
• The authorized qualified technician
must assess whether to replace the
gasket if necessary or adjust the
steam valve.
• The authorized qualified technician
must assess whether to replace the
gasket if necessary or adjust the hot
water manually valve.
• Verify the check valve and if
necessary replace it. Calibrate the
valve at 12 bar.
• The authorized qualified technician
must check the pump operating
pressure. Calibrate the pump at 9
bar.