84
system flow/return shut-off taps, turn con-
trol board power off, remove the casing
and empty the boiler through the relevant
drain. Place a collecting vessel under the fil-
ter.
Use pliers to remove the filter from the
relevant inserted tongue and clean it remo-
ving impurities and lime scale deposits.
4.6
FUNCTIONING ANOMALIES
When there is a functioning anomaly, an
alarm appears on the display
and switch
on the red led.
Descriptions of the anomalies with relative
alarms and solutions are given below:
–
FUMES DISCHARGE ANOMALY
ALARM 01
The fumes thermostat has intervened. If
the condition causing the problem persi-
sts for two minutes, the boiler stops for
an enforced period of thirty minutes.
At the end of this period, the boiler re-
attempts ignition.
–
LOW WATER PRESSURE ANOMALY
ALARM 02
(fig. 22/a)
If the pressure detected by the water
pressure valve is lower than 0.5 bar, the
boiler stops and the display shows the
alarm “AL 02”.
Bring the pressure back to normal by
means by acting on the telescopic loa-
ding knob.
Lower the knob and turn it anti-clockwise
to open until the pressure indicated on
the hydrometer reaches 1 - 1.2 bar.
WHEN FILLING HAS BEEN COMPLETED,
CLOSE THE KNOB BY TURNING IT
CLOCKWISE.
If the load procedure has to be repeated
several times, it is advisable to check
that the seal of the heating circuit is
intact (check that there are no leaks).
–
HEATING SENSOR ANOMALY ALARM
05
When C.H. sensor (SM) are open or
short circuited, the boiler will not func-
tion and the display will show the alarm
“AL 05”.
–
FLAME BLOCK ALARM 06
(fig. 22/b)
If the flame control has not detected the
presence of the flame after a complete
ignition sequence, or for any other rea-
son the card cannot “see” the flame, the
boiler will stop and the display will show
the alarm “AL 06”.
Press the key
of the controls to start
up the boiler again.
–
SAFET Y THERMOSTAT ANOMALY
ALARM 07
(fig. 22/c)
Opening the connection line with the
security thermostat determines boiler
shutdown. The display shows AL 07 and
the green led is turned on. If this condi-
tion is not restored in more than one
minute, the boiler will stop, the display
will still show anomaly AL 07 and the red
led will turn on.
Press the key
of the controls to start
up the boiler again.
–
PARASITE FLAME ANOMALY ALARM
08
If the flame control section recognises
the presence of flames also in phases
when they should not be present, it
means there is a breakdown in the flame
detection circuit; the boiler will stop and
the display will show anomaly “AL 08”.
–
AUXILIARY SENSOR ANOMALY
ALARM 10
ONLY FOR BOILER WITH SOLAR PLANT
COUPLING (
PAR 2 = 2
):
D.H.W. inlet probe anomaly. When the
probe is open or short circuited the boi-
ler looses the solar function and the
display shows anomaly AL 10.
–
FUMES PROBE INTERVENTION “AL 13”
(fig. 22/d)
If the fumes probe intervenes, the boiler
will stop and the display will show ano-
maly AL 13.
Press the key
of the controls to start
up the boiler again.
Fig. 21
Fig. 22/a
Apre
0
4
1
3
2
bar
Fig. 22/b
Fig. 22/c
OPEN
Fig. 22/d
Содержание FORMAT DGT HE 12
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