Biasi Activ A 12OV User manual

Wall hung, fan flue, room sealed, high efficiency gas boiler
Service manual
ActivA
Models: G.C. Appl. No.
Activ A 12OV
Activ A 15OV
Activ A 20OV
Activ A 25OV
Leave this manual adjacent to the gas meter
Warning
Service / repairs must be carried out, only by a qualified Gas
Safety Registered Engineer, who will be responsible for the cur-
rent Regulations for gas appliances.

Ta b l e o f c o n t e n t s
1 Overall information 1..................
1.1 Overall View 1.........................
1.2 Hydraulic diagram 1....................
2 General access and emptying
hydraulic circuits 2....................
2.1 Nomenclature 2........................
2.2 Case panels 2.........................
2.3 Control panel 2........................
2.4 Main electronic p.c.b. box 3.............
2.5 Emptying the primary circuit 4...........
3Diagrams 5...........................
3.1 Wiring diagram 5.......................
3.2 Circuit voltages 6......................
4Faultfinding 7........................
4.1 Display diagnostic 9....................
5 Condensing heat exchanger 10..........
5.1 Function 10.............................
5.2 Removal 10............................
5.3 Cleaning 11............................
6 Main electronic control/ignition p.c.b. 12.
6.1 Function 12.............................
6.2 Selection and adjustment devices 12......
6.3 Checking the temperature 13.............
6.4 Setting the boiler control function modes 13
6.5 Checks 15.............................
6.6 Removal of the electronic control p.c.b 15..
6.7 Thermal control in the ”c.h.” mode 17.....
7 Control panel electronic p.c.b. 18.......
7.1 Function 18.............................
7.2 Normaly information 18..................
7.3 Info modality 19.........................
7.4 Function modes setting modality 19.......
7.5 Removal of the control panel electr. p.c.b 19
8Gasvalve 21...........................
8.1 Function 21.............................
8.2 Description of the parts 21...............
8.3 Adjustment 21..........................
8.4 Checks 23.............................
8.5 Removal of the gas valve 23..............
9 Temperature probe 25..................
9.1 Function 25.............................
9.2 Checks 25.............................
9.3 Removal of the c.h flow temp. probe 25....
9.4 Removal of the c.h. return temp. probe 25..
10 Fan and Air box 27.....................
10.1 Function 27.............................
10.2 Removal of the Fan and the Air box 27.....
11 Ignition and detection electrodes
and burner 28..........................
11.1 Function 28.............................
11.2 Removal of the Ignition and detection
electrodes 28...........................
11.3 Removal of the burner 28................
11.4 Checks 28
.............................
12 Safety thermostat 30...................
12.1 Function 30.............................
12.2 Checks 30.............................
12.3 Removal 30............................
13 Flue temperature probe NTC
and Safety thermal fuse 31..............
13.1 Function 31.............................
13.2 Removal 31............................
13.3 Checks 31.............................
14 Condensate trap 32....................
14.1 Function 32.............................
14.2 Check the cleanness of the trap 32........
14.3 Removal 32............................
15 Short spare parts list 33................

1
1Overall information
1.1 Overall View
Flue temperature
probe NTC C.h. flow
temp. probe
Condensing
heat exchanger
Safety
thermostat
Detection
electrode
Ighition
electrodes
Burner
Fan
Air box
(air/gas mixer)
Pipe silencer
Electronic
control box
Condensate
trap
C.h. pressure
relief valve
Condensing heat
purger valve
Control
panel
Gas valve
Gas restrictor
C.h. return
temp. probe
exchanger air
1.2 Hydraulic diagram
Central heating (c.h.) operation
C.h.
water flow
C.h.
water return
C.h.
water return
C.h.
water flow

2
2General access and emptying
hydraulic circuits
2.1 Nomenclature
3
5
1
4
2
Fig. 2.1
1 Right side panel
2 Main electronic p.c.b. box
3 Front panel
4 Control panel
5 Left side panel
2.2 Case panels
Warning: isolate the boiler from the mains
electricity supply before removing any
covering or component.
For the most part of the check and maintenance oper-
ations it is necessary to remove one or more panels of
the case.
Thesidepanelscanberemovedonlyaftertheremoval
of the front panel.
To remove the front panel loosen screws A(Fig. 2.2).
A
B
B
Fig. 2.2 --- bottom view of the boiler
Pull the lower part of the front panel and lift it upwards
(Fig. 2.3).
C
C
Fig. 2.3
To remove the side panels loosen the screws B
(Fig. 2.2) and C(Fig. 2.3).
Pullthesidepanelstowardstheoutside.
To F i t t he c a s e p a n e l s
Fit the side case panels
Warning:
Fitthefrontpanelhookingitontheupperside.
Push the front case panel until it is completely hold in
place (Fig. 2.4).
Ensure that the front panel edge is close---fitting to the
side panels.
Lock in place the panel with the appropriate screws.
Fig. 2.4
2.3 Control panel
Warning: isolate the boiler from the mains
electricity supply before removing any
covering or component.
To gain access to the parts located inside the control
panel proceed as follows:
1 Remove the front panel of the case.
2 Unscrew the screw D(Fig. 2.5)

General access and emptying hydraulic circuits
3
3 Free the hooks indicated and rotate the lid to-
wards left (Fig. 2.5).
D
Fig. 2.5
4 To access to the parts located inside the control
panel turn it as shown in Fig. 2.6.
Fig. 2.6
2.4 Main electronic p.c.b. box
Warning: isolate the boiler from the mains
electricity supply before removing any
covering or component.
To gain access to the parts located into main electronic
p.c.b. box proceed as follows:
1 Remove the front panel of the case.
Terminal block lid removal
2 To remove the terminal block lid E(Fig. 2.7), free
the front hooks.
E
Fig. 2.7
3 Slightly rotate the lid as indicated by the curved
arrow and free the rear hooks.
4Removethelid.
Main electronic p.c.b. lid removal
To get access to the main electronic p.c.b.:
5 Pull the box that contains the electronic p.c.b.
and rotate it (Fig. 2.8).
Fig. 2.8
6 Remove the terminal block lid E (Fig. 2.7).
7 Free the hooks placed on the three sides indi-
cated and rotate the lid towards left (Fig. 2.9).

General access and emptying hydraulic circuits
4
Fig. 2.9
2.5 Emptying the primary circuit
1 Close the c.h. circuit flow and return cocks.
2 Remove the front and right panels of the boiler.
3 Open the drain tap F(Fig. 2.10) until the boiler is
completely emptied.
F
CLOSED
OPEN
Fig. 2.10
4 To help the draining of the primary circuit loose
the condensing heat exchanger air purger valve
G(Fig. 2.11)
G
Fig. 2.11
Attention: some water could remain in the condens-
ing heat exchanger.
5 Close drain tap once the emptying has been
completed.

5
3Diagrams
3.1 Wiring diagram
1
2
3
L
N
1
3
4
t
M
~
t
Room thermostat
Pump
terminal block
Electric supply
terminal block
Gas valve
External temp.
Remote
Fan
Ignition
electrodes Flame detection
electrode
Time switch (option)
Flue temp.
Safety
thermostat
C.h. flow temp.
probe NTC
probe
Condensate
trap
bu
bn
bu
bn
og
vt
bu
bn
bk
bk
rd
rd
bu
gnye
bn
ye
vt
bn = brown
bu = blue
bk = black
wh = white
rd = red
og
gy = grey
gn = green
ye = yellow
vt = violet
og = orange
gnye = green/yellow
rdwh = red/white
ye
bk
bk
bk
bk
bk
bk
bu
bu
bu
bu
rd
rd
bk
bk
gy
gy
gy
gy bk
bu
rd rd
bu
bk
bu
bn
gnye
gnye bu
bn
bu
gy
terminal block
probe NTC
Fuse 2AF 250VAC
5x20
wh
wh
wh
whwh
wh
gy
wh
og
og
bk
bk
wh
wh
t
wh
wh
C.h. return temp.
probe NTC
gnye

Diagrams
6
3.2 Circuit voltages
230~
Electrical voltages with burner on during c.h. operation
230~
Safety
thermostat
0
FanSupply network
230~
C.h. external
230~
Gas valve
pump

7
4Fault finding
Components to check
Section of the manual ! (note ref. in brackets)
---
(1)
---
(2)
---
(3)
14.1 ---
(4)
5--- 6.5 78.4 9.2 10 11.4 12.2 12.2 13.1 ---
(7)
--- --- --- ---
Appliance lock---out (*)
Defect #
Power supply line
Gas supply line
Flue pipes
Cond. drain pipe and trap
C.h. circuit
Condensing heat exchanger
External pump
Fuses (Electronic p.c.b.)
Main electronic p.c.b.
Boiler settings
Control panel electr. p.c.b.
Gas valve
C.h. flow temp. probe
C.h. return temp. probe
Fan / air restrictor
Ignition electrode
Detection electrode
Safety thermostat
Gas restrictor
Flue temp. probe NTC
Expansion vessel external
Safety valve external
Pressure gauge external
External temp. probe
Room themostat delayed
Er 01 J J J J Er 02 J J Er 03 J Er 04 J J Er 05 J Er 06 J J Er 08 J Er 09 J J Er 10 J J An 11 J J J Er 14 J J J
r”
Er 15 J J J
s”Er
Er 16 J J
c
ate
s
Er 17 J J
indi
c
Er 18 J J J J
p
lay i
L3 J J J J J
Disp
TD J

8
Components to check
Section of the manual ! (note ref. in brackets)
---------------
(7)
13.112.212.211.4109.28.476.5---5---
(4)
14.1---
(3)
---
(2)
---
(1)
Appliance lock---out (*)
Room themostat delayed
External temp. probe
Pressure gauge external
Safety valve external
Expansion vessel external
Flue temp. probe NTC
Gas restrictor
Safety thermostat
Detection electrode
Ignition electrode
Fan / air restrictor
C.h. return temp. probe
C.h. flow temp. probe
Gas valve
Control panel electr. p.c.b.
Boiler settings
Main electronic p.c.b.
Fuses (Electronic p.c.b.)
External pump
Condensing heat exchanger
C.h. circuit
Cond. drain pipe and trap
Flue pipes
Gas supply line
Power supply line
Defect #
o
nondisplay
The boiler does not start. The control panel display OFF Fan still.
J J J J
indicatio
n
Incorrect modulation J J J J
No ”Er” i
Noisy bolier JJ J JJJJ
---
Water leaks from the safety valve during operationonc/h
J JJJJ
---
Water leaks from the safety valve when the boiler is off.
JJJ
* Lock out is indicated as “Er”onthedisplay. Note Useful information can be obtained also from the optical indication given by the appliance display (see section 4.1). 1 Check for 230V~ between line (L) and neutral (N)
Verify the integrity of supply cable, plug and external fuses. Check the polarity of line and neutral connection
2 Check the gas supply pipe and isolation tap for gas tightness. 3 Check for soundness and absence of obstructions. Verify that
the flue terminal is correctly installed (see clearances) and en- sure that exhaust gas is not sucked back by the boiler.
4 Check for soundness of the circuit and verify its correct filling
(see also installation manual).
5 A j a m m e d b y --- p a s s c o u ld c a u s e t h e o v e r --- h e a t i n g o f t h e m a i n
circuit and the intervention of the safety thermostat.
6 Using the flue analyzer, check the CO2value of the flue gases.
This reading is a reference value for the gas valve setting.
7 Check the pressurization of the expansion vessel. Refer to the
installation manual for proper values.
8 The boiler doesn’t reach the nominal heat input.

9
4.1 Display diagnostic
The display indications provide help in the diagnosis of
fault finding.
The control panel display gives other information for the
user.
The following table gives fault code, error and the reson
for the fault.
Er 01 + RESET Lack of burner ignition
Er 02 + RESET Safety thermostat lockout
Er 03 + RESET Other faults
Er 04 +Faulty primary circuit (no water or
absence of flow)
Er 05 +Faulty fan control system
Er 06 +Faulty c.h. temperature probe
NTC
Er 08 +Faulty external temperature probe
NTC (if fitted)
Er 09 +Faulty flue temperature probe
NTC
Er 10 + RESET Lockout --- flue temperature probe
NTC (Flue temperature > 120 ˚C)
Er 14 + RESET
Faulty pump (absence of water
flow in the main circuit) or primary
temperature above 105 ˚C
Er 15 + RESET
None or too low water flow; Faulty
pump (temp. difference between
probes higher than 35˚C)
Er 16 + RESET
Possible exchange of NTC probes
(Flow or Return) or pump wrongly
mounted (upside --- down)
Er 17 + RESET Faulty c.h. temperature probe
NTC (Flow or Return)
Er 18 + RESET Faulty primary circuit (no water or
absence of flow)
L3
Useful output limitation (tempera-
ture difference between probes
higher than 25˚C) : Boiler test
performing
Td Thermostat Delayed : Boiler test
performing
An 11 Parasite flame

10
5Condensing heat exchanger
5.1 Function
The Condensing heat exchanger Ain Fig. 5.1 has the
function of transferring heat produced from combus-
tion of the gas and from the flue exhausted gas to the
water circulating in it.
A
B
C
Fig. 5.1
By reducing the combustion products temperature, the
latent heat of the vapour is transferred to the water cir-
cuit, allowing an extra gain of useful heat.
The condensed vapour is then drained through the
condensate trap Band the draining pipe C.
5.2 Removal
Warning: isolate the boiler from the mains
electricity supply before removing any
covering or component.
1 Turn off the gas supply.
2 Removeallthecasepanels(seesection2).
3 Disconnect the flue system from the boiler.
4 Disconnect the air manifold D(Fig. 5.4) by pulling
it.
5 Disconnect the rubber pipe E(Fig. 5.2).
6 Unscrew the gas connectors F.
7 Remove gas pipe G.
8 Unscrew the screws and remove the detection
electrode connector H.
9 Unscrew the screws and remove the ignition elec-
trodes connector I.
10 Unscrew the screw and remove the overheat
thermostat J.
11 Disconnect the connector Kby pressing the plas-
tic hook placed on the side of the connector.
12 Disconnect the connector L
J
I
H
K
E
F
G
L
Y
N
S
X
N
Y
F
Fig. 5.2
13 Disconnect the fan connector Mby pressing the
plastic hook placed on the side of the connector
(Fig. 5.4).
O
P
Fig. 5.3
14 Empty the primary circuit of the boiler.
15 Remove the forks N(Fig. 5.2).
16 Loosen the connection Oand remove the pipe P
(Fig. 5.3) from the Condensing heat exchanger.

Condensing heat exchanger
11
17 Loosen the connection Qand remove the pipe R
(Fig. 5.4) from the Condensing heat exchanger.
18 Unscrew the screws S.
19 Remove the fan---burner group.
V
W
D
M
Q
R
X
Fig. 5.4
20 Unscrew the screws Tand remove the plate U
(Fig. 5.5).
21 Remove the forks Vand remove the condensate
trap Wmoving it downwards (Fig. 5.4).
T
U
Fig. 5.5
22 Loosen the screws X(Fig. 5.4 --- Fig. 5.2)
23 Unscrew the screws Y(Fig. 5.2).
24 Remove the Condensing heat exchanger slightly
move it upwards, turn it frontwards freeing it from
the below screws X(Fig. 5.4 --- Fig. 5.2) and then
extractitforwards.
25 Reassemble the Condensing heat exchanger
carrying out the removal operations in reverse
order.
Ensure to tighten the screws S --- Fig. 5.2 firmly
5.3 Cleaning
If there are deposits of dirt between the fins of the Con-
densing heat exchanger, clean with a bristlepaintbrush
and remove the dust with a hoover.
Warning: After cleaning or replacement as
detailed above, it is deemed necessary to
undertake a combustion analysis as detailed
in chapter 8.3 section 11.

12
6Main electronic control/ignition
p.c.b.
6.1 Function
From other boiler devices....
C.h. flow temperature probe NTC
C.h. return temperature probe NTC
Flue temperature probe NTC
Safety thermostat
Flame detection electrode
Room thermostat (if fitted)
Time switch (if fitted)
On the Main electronic control/ignition
p.c.b.......
Function control
C.h. temperature adjustment
Boiler reset button
(printed circuit board p.c.b.)
Inlet Information
External Pump
Gas valve
Fan
Ignition electrodes
Display indicates “Er”*
*control panel electronic p.c.b.
Outlet command
Fig. 6.1
The fundamental function of the Main electronic con-
trol/ignition p.c.b. is that of controlling the boiler in rela-
tion to the external needs (i.e. heating the dwelling) and
operating in order to keep the temperature of the hy-
draulic circuits constant.
This is obviously possible within the useful power and
maximum working temperature limits foreseen.
Generally, the Main electronic control/ignition p.c.b. re-
ceives inlet information coming from the boiler (the
sensors) or from the outside (printed circuit board
p.c.b., room thermostat, etc.), processes it and conse-
quently acts with outlet commands on other compo-
nents of the boiler (Fig. 6.1).
The Main electronic control/ignition p.c.b. is also a full
sequence ignition device and does a sequence of oper-
ations (ignition cycle) which lead to the ignition of the
gas at the burner
It checks the presence of the flame during the entire
period in which it is activated and supplies the fan regu-
lating its speed.
The Main electronic control/ignition p.c.b. has a safety
function and any incorrect interventions or tampering
can result in conditions of dangerous functioning of the
boiler.
The Main electronic control/ignition p.c.b. can lock the
functioning of the boiler (lock state) and stop its func-
tioning up to the resetting intervention. The lock---out is
signalled on the display of the control panel electronic
p.c.b. and can be reset only by using the boiler reset
button placed on the printed circuit board p.c.b. (see
section 7.1).
Some components which are connected to the device
can activate the lock state. The causes of a lock state
could be:
fThe intervention of the safety thermostat (over-
heat of the primary circuit).
fThe intervention of the flue temperature probe
(overheat of the combustion products).
fA fault on gas supply.
fFaulty ignition (faulty ignition electrodes, their wir-
ing or connection).
fFaulty flame detection (faulty detection electrode,
its wiring or connection).
fFaulty condensate drainage.
fFaulty gas valve (faulty on---off operators or not
electrically supplied).
fFaulty Main electronic control/ignition p.c.b..
Other components like the c.h. temperature probes
NTC switch can temporarily stop the ignition of the
burner but allow its ignition when the cause of the inter-
vention has stopped.
NO TAG and Fig. 6.12 show the sequence of the oper-
ations that are carried out at the start of every ignition
cycle and during normal functioning.
6.2 Selection and adjustment devices
On the Main electronic control/ignition p.c.b. several
selection, adjustment and protection devices are lo-
cated. (Fig. 6.2).

Main electronic control/ignition p.c.b.
13
Some of these devices are directly accessible by the
user (function control, temperature adjustment etc.)
others, like the fuses, are accessible by removing the
main electronic p.c.b. lid.
8
11
10
5
12
13
9
7
6
321 4
Fig. 6.2
1 Connector --- ignition electrode.
2 Connector --- flame detection electrode.
3 Connector --- controler fan.
4 Connector ---c.h. return temperature probe NTC
5 Connector --- flue temperature probe NTC.
6 Connector --- external temperature probe (op-
tional).
7 Connector --- safety thermostat and c.h. flow tem-
perature probe NTC.
8 Connector --- remote control (optional).
9 Connector --- display and function control / c.h.
temperature adjustment control panel p.c.b.
10 Fuse F1, F2 2A F
11 Connector --- electric supply Main electronic con-
trol/ignition p.c.b.
12 Connector --- electric supply control panel p.c.b.
13 Connector --- gas valve, external pump and fan.
6.3 Checking the temperature
The Main electronic control/ignition p.c.b. makes it
possible adjust the c.h. water flow temperature.
The temperature of the water is converted into an elec-
tric signal by means of temperature probes.
The user, setting the desired temperature with the con-
trol panel p.c.b. key
If the power requested is lower than 40% of the maxi-
mum power output then control is achieved by switch-
ing ON the burner at minimum power, then switching
OFF (ON/OFF function). If the power requested is
higher, then the burner is switched ON at maximum
power and will control by modulating to 40% of the
maximum power output.
During the c.h. operation (Fig. 6.3), the signal coming
from the c.h. temperature probe is compared to the sig-
nal given by the control panel p.c.b. through the adjust-
ment made by the user (key ). The result of
such a comparison operates the fan speed thus regu-
lating the gas flow rate and consequently changing the
useful output of the boiler.
Fig. 6.3
The control sequences in c.h. function are illustrated in
detail in section 6.7.
6.4 Setting the boiler control function modes
It is possible to select the various boiler control function
modes hereafter named “parameters” by using the
keys of the control panel p.c.b.
A
B
C
Fig. 6.4
1 To enter in the parameters setting mode press
contemporary the 3 keys (A--- B--- CFig. 6.4) for
10 second until the display shows Fig. 6.5

Main electronic control/ignition p.c.b.
14
Fig. 6.5
2 To move through the parameters press c.h. set
keys (A or C Fig. 6.6)
A
C
Fig. 6.6
3 The display shows Fig. 6.7
Fig. 6.7
4 To modify the parameter press contemporary the
k e y s ( A --- B F i g . 6 . 8 )
A
B
Fig. 6.8
5 To change the parameters press c.h. set keys (A
or C Fig. 6.6)
6 To memorize the setting press the key (B Fig. 6.9)
B
Fig. 6.9
7 To exit for setting without modifing the set press
t h e k e y s ( B --- C F i g . 6 . 1 0 )
C
B
Fig. 6.10
To reset the boiler to the normal operation press con-
t e m p o r a r y t h e 3 k e y s ( A --- B --- C F i g . 6 . 4 ) f o r 1 0 s e c -
ond.
The following table gives details of each parameter and
thepossiblevaluethatcanbeset.
Important: at the end of the setting operation it is im-
portant to fill/update the table in the installation
manual see chapter COMMISSIONING section: Set-
ting record.
PARAMETER DIGIT VALUES
Boiler type (to be up-
dated with the com-
plete range)
Pr 01 00 =NopowerEr99
18 = Activ A 12OV
19 = Activ A 15OV
20 = Activ A 20OV
21 = Activ A 25OV
Not used Pr 02
Not used Pr 03
Not used Pr 04
Gas type Pr 05 00 =G20Natural
05 =G31Propane
Not used Pr 06
C.h. flow max
temperature ˚C
Pr 07 85 ÷45 (factory set
85 ˚C)
Factory parameters
reset
Pr 08 00 = No reset
04 = All parameters
return to factory set
with the exclusion of
Pr 01 and Pr 05
39 = All parameters
return to factory set
included Pr 01
and Pr 05

Main electronic control/ignition p.c.b.
15
PARAMETER DIGIT VALUES
Chimney sweep
function
Pr 09 00 =Nochimney
sweep fun (factory
set)
01 =Lowpower
sweep---test
04 =C.h.power
sweep---test
07 = D.h.w. power
sweep---test
C.h. reignition fre-
quency
Pr 10 00 ÷99 (0÷600 sec.)
(factory set 30 =3
minutes)
C.h. pump post---cir-
culation
Pr 11 00 ÷99 (0÷600 sec.)
(factory set 10 =1
minute)
Max. useful output in
c.h. mode
Pr 12 00 ÷99 (0÷100%)
factory set:
99 = Activ A 12OV
99 = Activ A 15OV
99 = Activ A 20OV
99 = Activ A 25OV
C.h. pump working
type
Pr 13 00 = Depends on
room thermostat
(factory set)
04 = Always running
Ignition power Pr 14 00 ÷99 (0÷100%)
factory set:
Natural gas (G20)
30 = Activ A 12OV
30 = Activ A 15OV
30 = Activ A 20OV
40 = Activ A 25OV
Propane (G31)
40 = Activ A 12OV
40 = Activ A 15OV
40 = Activ A 20OV
40 = Activ A 25OV
K value (external
probe diagram)
Pr 15 01 (=0,1)÷60 (=6,0)
Kvalue
factory set:
00 =Off
Not used Pr 16
D.h.w. burner turn off
function
Pr 17 00 = Burner off at
fixed d.h.w. = 65 ˚C
(factory set)
01 = Brurner off at
set point +5 ˚C
NTC on the c.h. re-
turn
Pr 18 00 = Probe not pres-
ent
(factory set)
01 = Probe present
PARAMETER DIGIT VALUES
Not used Pr 19
Not used Pr 20
Not used Pr 21
Not used Pr 22
Not used Pr 23
Not used Pr 24
Not used Pr 25
Not used Pr 26
C.h. minimum set-
point
Pr 27 25 ÷45 (factory set
25 ˚C)
Ta b . 6 .1
6.5 Checks
nCheck that the fuses are complete
If the Main electronic control/ignition p.c.b. does not
supply any device (pump, fan, etc.) check that the
fuses 10 (Fig. 6.2) are complete.
If a fuse has blown replace it with one that has the same
characteristics after having identified the reason for fail-
ure.
nLock sequence
Start the boiler until the burner is ignited.
With the burner firing, interrupt the gas supply. The
Main electronic control/ignition p.c.b. must carry out
four complete ignition cycles and then, after about 4
minutes, goes to lock---out state.
Switch off and on the electricity supply to the boiler, by
means of the fused spur isolation switch, the device
must not unlock and the burner must not turn on
6.6 Removal of the electronic control p.c.b
Warning: isolate the boiler from the mains
electricity supply before removing any
covering or component.
When replacing the Main electronic control/ignition
p.c.b. all parameters must be correctly checked /
adjusted accordingly with the values noted in table
in the installation manual see chapter COMMIS-
SIONING section: Setting record (for information on
parameters see also section 6.4).
1 Removeallthebodypanels(seesection2.2).
2 Gain access to the parts located inside the Main
electronic p.c.b. box as explained in the section
2.4 of this manual.
3 Remove all the wiring connected to the Main elec-
tronic control/ignition p.c.b..

Main electronic control/ignition p.c.b.
16
4 Delicately flex the hooks Din the directions indi-
cated (Fig. 6.11) in order to release the circuit
from the box.
5RemovetheMain electronic control/ignition
p.c.b..
D D
Fig. 6.11
6 R e --- a s s e m b l e t h e Main electronic control/igni-
tion p.c.b. following the removal procedures in
the reverse order.
Important
W h e n r e --- a s s e m b l i n g t h e Main electronic control/igni-
tion p.c.b.:
7 It is not necessary to utilise static protections but
it is advisable to ensure that the pcb is handled
with care and held at the edges and with clean dry
hands.
Attention
After installing the Main electronic control/ignition
p.c.b. properly set the parameters.
Warning: After cleaning or replacement as
detailed above, it is deemed necessary to
undertake a combustion analysis as detailed
in chapter 8.3 section 11.

Main electronic control/ignition p.c.b.
17
6.7 Thermal control in the ”c.h.” mode
lock memorised?
Switch in the c.h. function mode
Request for heat from
room thermostat?
circulator off
fan still
circulator on
Is primary circuit
temperature higher than that
selected?
YES
Temp. difference
between probes
higher than 35˚C?
NO YES
NO
starts fan
checks fan rpm
YES
cancels lock
Is fan rpm
exact?
NO YES
Is flue
temperature higher than 110˚C?
YES
NO
beginning of wait period
flame presence?
End of wait
period?
YES NO
YES
starts ignition discharges
Opens gas valve
beginning of ignition period
flame presence? YES
interrupts ignition discharges
gas valve open
fan runs
End of ignition
period?
NO
NO YES
closes gas valve
stops fan
interrupts ignition discharges
memorizes lock
display show lock--- out
reset key
pressed?
flame presence? NO
NO
Is fan rpm
exact? YES
NO
safety thermostat or flue
temperature probe lock out? YES
NO
YES
YES
stop circulator (3min)
YES
NO
NO
Fig. 6.12

18
7Control panel electronic p.c.b.
7.1 Function
A
C
B
D
Fig. 7.1
A) C.h. temperature increase key
B) C.h. temperature reduce key
C) Reset/Stand---by/Winter/Summer key
D)Display
The Control panel electronic p.c.b. can give to the ser-
vice 3 levels of informations:
fNormally information
fInfo modality
fFunction modes setting modality
7.2 Normaly information
KEY
RESET
The symbol indicates that the boiler
can be directly reactivated by the user,
by pressing the reset button.
The symbol indicates that the fault re-
quires intervention on behalf of specia-
lised technical assistance.
All symbols represented with lines that
surround them, indicate that the sym-
bol is flashing.
SIGNAL DISPLAYED BY THE LCD
LCD FUNCTION
Er 01 + RESET Lack of burner ignition on safety
lockout
Er 02 + RESET Safety thermostat intervention
lockout
Er 03 + RESET General lockout
Er 10 + RESET Flue probe interven lockout
Er 14 + RESET Faulty pump or primary tempera-
ture above 105˚C
Er 15 + RESET
None or too low water flow; Faulty
pump (temp. difference between
probes higher than 35˚C)
Er 16 + RESET
Possible exchange of NTC probes
(Flow or Return) or pump wrongly
mounted (upside --- down)
LCD FUNCTION
Er 17 + RESET Faulty c.h. temp. probe NTC
(Flow or Return)
Er 18 + RESET Faulty primary circuit (no water or
absence of flow)
Er 04 +Faulty primary circuit (no water or
absence of flow)
Er 05 +Faulty fan control system
Er 06 +Faulty c.h. temp. probe NTC
Er 08 +Faulty external temp. probe NTC
Er 09 +Faulty flue temp. probe NTC
B o i le r S t a n d --- B y ( a n t i --- f r e e z e
protection activaded)
Boiler waiting for heat request.
Boiler in winter mode.
The primary circuit temperature is
displayed.
Boiler on demand for c.h. power.
Burner ignition (spark)
Flame present (Burner on)
Boiler in anti---freeze phase (bP
flasching + temperature flashing)
Boiler in antifrost phase (AF
flasching + temperature flashing)
Set c.h.
(all other symbols are disabled)
Pump activated for the post---cir-
culation phase (Po flashing +
temperature flashing)