Problem Solving - La San Marco 85 Manuel D'utilisation Et D'entretien

11. Problem solving

PROBLEM
1. The boiler is full of water
and the water flows out of
the safety valve.
2. The safety valve trips in
and vents the steam.
3. The machine was started
properly but the water in the
boiler does not warm up.
4. There is no water flowing
from a serving unit.
5. The programmed servings
of espresso coffee are not
constant or vary on the dif-
ferent units.
6. It is not possible to pro-
gram the serving quantities
on unit 1 and to copy them
on the other units.
7. Displacement meters alarm.
8. Autolevel alarm.
9. The machine is switched on
(the main switch is in posi-
tion 1 or 2 and the signal
light is lit) but the electronic
control is out of order.
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CAUSE
the boiler or from a circuit of
the unit has a leak.
Malfunction of electrical system
(the electrical heating element
is always connected).
(the safety valve trips in at 1.9-
2.5 bar).
defective or is not connected.
excessive quantity for type of
filter used.
electronic control unit or of the
displacement counters.
valve.
Abnormal operation or defective
displacement meter of unit 1.
or defective.
circuit.
closed.
tronic control unit is defective.
defective.
SOLUTION
ual charging button, and the boiler
heat exchangers.
eliminate the leak.
Check the wiring that feeds the heat-
ing element and the pressure switch.
perature control, check the proper
operation of the electronic control
unit, the triac, the level probe, and the
electrical wiring.
nected to the power supply.
thermostat has tripped in and check
its proper operation.
perature control, check the proper
operation of the electronic control
unit, the triac, the level probe, and the
electrical wiring.
or the quantity of ground coffee.
circulation tube, the spray nozzle
and the solenoid of the unit are not
clogged.
ing, check the displacement meter
and its valves.
wiring and the fuse in the electronic
control unit.
rately on each serving unit. If the
problem persists, replace the dis-
placement meter of the serving unit
affected.
serving unit.
meters electrical wiring.
the control unit and the fuses.
autolevel.
supply is open.
- Check the electrical wiring, the elec-
tronic control unit and its compo-
nents.
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