La San Marco SERIES 85 / S-E, Operation And Maintenance, Page: 35 / 128

34
ENGLISH
11. Problem solving
The boiler is full of water
and the water flows out of
the safety valve.
The safety valve trips in
and vents the steam.
The machine was started
properly but the water in the
boiler does not warm up.
There is no water flowing
from a serving unit.
The programmed servings
of espresso coffee are not
constant or vary on the dif-
ferent units.
It is not possible to pro-
gram the serving quantities
on unit 1 and to copy them
on the other units.
Displacement meters alarm.
Autolevel alarm.
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.
1.
2.
3.
4.
5.
6.
7.
8.
9.
PROBLEM CAUSE SOLUTION
r0OF PG UIF PVUGMPX MJOFT GSPN
the boiler or from a circuit of
the unit has a leak.
r
Malfunction of electrical system
(the electrical heating element
is always connected).
r1SFTTVSF JODSFBTF JO UIF CPJMFS
(the safety valve trips in at 1.9-
2.5 bar).
r5IFFMFDUSJDIFBUJOHFMFNFOUJT
defective or is not connected.
r$PGGFF HSPVOE UPP GJOF PS
excessive quantity for type of
filter used.
r$MPHHFEXBUFSDJSDVJU
r%FGFDUJWFTPMFOPJE
r"COPSNBM PQFSBUJPO PG UIF
electronic control unit or of the
displacement counters.
r-FBLGSPNTFSWJOHVOJUTPMFOPJE
valve.
r Abnormal operation or defective
displacement meter of unit 1.
r%JTQMBDFNFOU NFUFST KBNNFE
or defective.
r%FGFDUJWFXJSJOH
r-BDL PG XBUFS JO UIF BVUPMFWFM
circuit.
r.BJO XBUFS TVQQMZ WBMWF
closed.
r'BVMUZBVUPMFWFMTPMFOPJE
r5IFFMFDUSJDXJSJOHPGUIFFMFD
-
tronic control unit is defective.
r5IF FMFDUSPOJD DPOUSPM VOJU JT
defective.
r$IFDLUIFBVUPMFWFMDJSDVJUUIFNBO
-
ual charging button, and the boiler
heat exchangers.
r3FQMBDF XPSO PS EBNBHFE QBSUT UP
eliminate the leak.
r
Check the wiring that feeds the heat-
ing element and the pressure switch.
r*O UIF NBDIJOFT XJUI FMFDUSPOJD UFN
-
perature control, check the proper
operation of the electronic control
unit, the triac, the level probe, and the
electrical wiring.
r$IFDL JG UIF IFBUJOH FMFNFOU JT DPO
-
nected to the power supply.
r$IFDL JG UIF IFBUJOH FMFNFOU TBGFUZ
thermostat has tripped in and check
its proper operation.
r*O UIF NBDIJOFT XJUI FMFDUSPOJD UFN -
perature control, check the proper
operation of the electronic control
unit, the triac, the level probe, and the
electrical wiring.
r"EKVTU UIF HSJOEJOH DPBSTFOFTT BOE
or the quantity of ground coffee.
r$IFDL UIBU UIF JOKFDUPS UIF VQQFS
circulation tube, the spray nozzle
and the solenoid of the unit are not
clogged.
r*OUIFNBDIJOFTXJUIFMFDUSPOJDNFUFS -
ing, check the displacement meter
and its valves.
r$IFDL UIF TPMFOPJE PG UIF VOJU JUT
wiring and the fuse in the electronic
control unit.
r1SPHSBNUIFTFSWJOHRVBOUJUJFTTFQB -
rately on each serving unit. If the
problem persists, replace the dis-
placement meter of the serving unit
affected.
r3FQMBDF UIF TPMFOPJE WBMWF PG UIF
serving unit.
r$IFDL UIF DPOUSPM VOJUEJTQMBDFNFOU
meters electrical wiring.
r3FQMBDFUIFEJTQMBDFNFOUNFUFS
r3FQMBDFUIFEJTQMBDFNFOUNFUFS
r$IFDLUIFXJSJOHBOEJUTDPOOFDUJPOT
the control unit and the fuses.
r$IFDL UIF IZESBVMJD DJSDVJU PG UIF
autolevel.
r$IFDLJGUIFPOPGGWBMWFPOUIFXBUFS
supply is open.
r3FQMBDFUIFBVUPMFWFMTPMFOPJE
r
Check the electrical wiring, the elec-
tronic control unit and its compo-
nents.
r3FQMBDFUIFFMFDUSPOJDDPOUSPMVOJU