27
4.4
MAINTENANCE
To guarantee the operation and efficiency
of the appliance and to conform to the
requirements of any extended warranty,
it must be serviced regularly.
This should be at least annually and can
only be done by a Gas Safe Registered
engineer.
Carry out the cleaning of the heat exchan-
ger in the following way:
– isolate the power supply and turn off the
gas isolation valve.
– Remove the outer casing and the gas
bur ner manif old unit. Ideall y use a
vacuum cleaner and a soft brush, so as
to remove any dust particles that may
have accumulated, take care not to
damage the insulation.
– Clean the heat exchanger, removing any
dust or residue from combustion. When
cleaning the heat exchanger or the bur-
ners, chemical products or steel bru-
shes MUST NOT BE USED.
Make sure that the tops of the burners
with the holes are free from encrusta-
tions.
– Reassemble the items removed from
the boiler, making sure to follow the cor-
rect sequence.
– Check operation of the main burner.
– After assembly of all the gas connec-
tions, these must be tested for tightness
using or appropriate products. DO NOT
USE NAKED FLAMES.
4.4.1
Chimney sweep function
To check the gas valve pressures, connect
a digital manometer to the downstream
pressure test point item 4 fig 14, press at
the same time the installer's key (
e
)
for a few seconds.
The chimney sweep function will switch on ,
the boiler will ignite, and will continue for 15
minutes.
During the 15 minutes functioning of chim-
ney sweep function, pressing the keys (
and
) take the boiler respective at maxi-
mum (Hi) and at minimum (Lo) power.
Compare the values to those shown in
table 7. During the chimney sweep opera-
tion the boiler will cut off at 80°C and re-
ignition at 70°C.
Before activating the chimney sweep func-
tion make sure that the radiator valves
and/or zone valves are open.
The test can also be carried out with the
boiler working in D.H.W. mode.
To this, after activating the chimney sweep
function, open one or more hot water taps.
Under these conditions, the boiler will func-
tion at maximum power with the D.H.W.
kept at between 60°C and 50°C.
During the test, the hot water faucets
must remain open.
To exit to the chimney sweep function press
the key
of the control panel.
The chimney sweep function will automa-
tically switch off after 15 minutes from
the activation.
4.5
FUNCTIONING ERRORS
When there is a functioning error, an alarm
appears on the display
and switch on the
red led.
Descriptions of the errors with relative
alarms and solutions are given below:
–
ALARM 01 (fig. 18)
The display shows “AL 01”.
It can be caused by:
a) The smoke stat has intervened;
b) Fan failure;
c) The air pressure switch has interve-
ned;
d) The condensate level sensor has inter-
vened.
e) Confirm that PAR 1 is set correctly.
The boiler stops for an enforced period
of 10 minutes.
At the end of this period, the boiler re-
attempts ignition.
If the error is repeated three times in 24
hours, the boiler locks out.
Press the key
of the controls to
start up the boiler again.
–
LOW WATER PRESSURE ERROR
ALARM 02 (fig. 18/a)
If the system pressure detected by the
water pressure switch is lower than 0.5
bar, the boiler stops and the display
shows the alarm “AL 02”.
Using the external filling loop, increase
the pressure indicated on the pressure
gauge to between 1 and 1.2 bar.
WHEN FILLING HAS BEEN COMPLETED,
ENSURE THAT THE FILLING LOOP IS
TURNED OFF AND THE HOSE DISSCON-
NECTED.
If the refilling procedure has to be
repeated several times, it is advisable
to check that the heating circuit is
intact (check that there are no leaks).
–
ALARM 04
IConfirm that PAR 2 is set correctly.
–
HEATING SENSOR ERROR
ALARM 05
If one or both sensing elements of hea-
ting sensor (SM1/SM2) are open or
short circuited, the boiler will not func-
tion and the display will show the alarm
“AL 05”.
–
LOCKOUT ALARM 06 (fig. 18/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.
Fig. 18
Fig. 18/b
0
4
1
3
2
bar
Fig. 18/a
