Biasi BASICA COND User manual

Wall hung, fanflue, roomsealed, high efficiency gas boiler
User manual and
Installation instructions
BASICA COND
Product name Models G.C. Appl. No.
BASICA COND 24C M275V.2024 SM 47-583-49
BASICA COND 28C M275V.2428 SM 47-583-50
BASICA COND 32C M275V.2832 SM 47-583-51

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WARNING
Congratulations on your choice.
The Biasi BASICA COND are condensing high efciency sealed chamber fan ue gas boil-
ers. They are fully electronically controlled and have electronic ignition.
The materials they are made of and the control systems they are equipped with give you
safety, a high level of comfort and energy savings to allow you to get the greatest benet out
of independent heating.
The Biasi BASICA COND allow a higher efciency by reducing the ue gas temperature
such that the water vapour formed during the combustion is condensed out.
This allows a gain of useful heat that otherwise would be lost.
Biasi UK Ltd is a licensed member of the Benchmark Scheme which aims to improve the
standards of installation and commissioning of domestic heating and hot water systems in
the UK and to encourage regular servicing to optimise safety, efciency and performance.
Benchmark is managed and promoted by the Heating and Hot water Industry Council. For
more information visit www.hhic.co.uk.
DANGER: The indications marked with this symbol must be observed to pre-
vent accidents of mechanical or generic origin (e.g.: Injuries or bruises).
DANGER: The indications marked with this symbol must be observed to pre-
vent accidents of electric origin (electrocution).
DANGER: The indications marked with this symbol must be observed to pre-
vent the risk of re or explosion.
DANGER: The indications marked with this symbol must be observed to pre-
vent accidents of heat origin (burns).
ATTENTION: The indications marked with this symbol must be observed to
prevent malfunctioning and/or damage to materials of the appliance or other
objects.
ATTENTION: The indications marked with this symbol are important informa-
tion that must be carefully read.

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WARNING
Remember that...
The manual must be read thoroughly, so that you will be able to use the boiler in a safe
and sensible way and must be carefully kept. It may be necessary for reference in the
future.
The rst ring must be carried out by a competent and responsible Gas Safe engineer.
The manufacturer
• disclaims all liability for any translations of the present manual from which incorrect
interpretation may occur;
• cannot be held responsible for non-observance of instructions contained in this manual
or for the consequences of any procedure not specically described.
Please ensure that the installer has fully completed the Benchmark Checklist on the inside
back pages of the installation instructions supplied with the product and that you have signed
it to say that you have received a full and clear explanation of its operation. The installer is
legally required to complete a commissioning checklist as a means of complying with the
appropriate Building Regulations (England and Wales).
All installations must be notied to Local Area Building Control either directly or through a
Competent Persons Scheme. A Building Regulations Compliance Certicate will then be
issued to the customer who should, on receipt, write the Notication Number on the Bench-
mark Checklist.
This product should be serviced regularly to optimise its safety, efciency and performance.
The service engineer should complete the relevant Service Record on the Benchmark
Checklist after each service.
The Benchmark Checklist will be required in the event of any warranty claim.
Before lighting the boiler you are advised to have a Gas Safe Registered Engineer
check that the installation of the gas supply is
• gas-tight;
• of the correct gauge for the ow to the boiler;
• tted with all the safety and control devices required by the current Regulations.
Ensure that
• the installer has connected and terminated the pressure relief valve in a manner which
allows safe discharge. The manufacturers are not responsible for damage caused by
opening of the pressure relief valve and consequent escape of water, if this is not con-
nected and terminated.
• the installer has connected the condensate outlet to a suitable drain pipe.

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WARNING
On detecting the smell of gas:
• do not operate any electrical switches, the telephone or any device that may produce
sparks;
• open the windows and doors at once to create a draught of air which will purge the area;
• shut off the gas cocks;
• get the assistance of a qualied person. Emergency telephone number
Tel. [phone].
Do not touch the appliance with parts of the body that are wet or damp and/or bare feet.
Do not block or modify the condensate outlet and pipe work.
In case of structural work or maintenance near the ue and ue terminal turn off the
appliance. On completion of the work, have a professionally qualied person check there
efciency.
Repairs (under guarantee) must be carried out only by a Biasi an approved engineer, us-
ing genuine spare parts. Thus do no more than switching off the boiler yourself (see the
instructions).
Your boiler allows heating up of water to a temperature less than boiling point therefore it
• must be connected to a central heating system and/or a hot water supply system, com-
patible with its performance and output;
• can be used only for those purposes for which it has been specially designed;
• must not be touched by children or by those unfamiliar with its operation;
• must not be exposed to weather conditions.
During the operation it is quite normal that the boiler produces a white plume of conden-
sation vapour from the ue terminal. This is due to the high efciency of the appliance and
may be particularly evident with low outdoor temperatures.
Safe handling of substances
Biasi products are manufactured in accordance with ISO 9001 and do not, and will not,
contain any hazardous materials or substances such as asbestos, mercury or C.F.C.’s. The
appliance packaging does not contain any substances, which may be considered a hazard
to health.
When handling or lifting always use safe techniques.
• Keep your back straight, bend your knees, don't twist.
• Move your feet, avoid bending forwards and side ways and keep the load as close to your
body as possible.
Where possible transport the boiler using a sack truck or other suitable trolly.
Always grip the boiler rmly, and before lifting feel where the weight is concentrated to estab-
lish the centre of gravity, repositioning yourself as necessary.

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WARNING
Combustion chamber panels
Material: mineral bres
Known hazards - Some people can suffer reddening and itching of the skin. Fibre entry into
the eye will cause foreign body irritation, which can cause severe irritation to people wearing
contact lenses. Irritation to respiratory tract.
Precautions - Dust goggles will protect eyes. People with a history of skin complaints may
be particularly susceptible to irritation. High dust levels are only likely to arise following harsh
abrasion. In general, normal handling and use will not present high risk. Follow good hygiene
practices; wash hands before, touching eyes, consuming food, drinking or using the toilet.
First aid - Medical attention must be sought following eye contact or prolonged reddening of
the skin.
Sharp Edges
Caution should be taken when handling the boiler to avoid sharp edges on the boiler.
Boiler installation and commissioning tips
The installation must be carried out by a qualied Gas Safe Registered Engineer who
will be responsible for observing the current Regulations and the completion of the
Benchmark Gas Boiler System Commissioning Checklist, located at the back of this User
manual.
Internally installed mains water meters
Please ensure if the property has had a water meter installed inside the property, that it does
not include a non-return valve. Should you nd that it does include a non-return valve then
provision of a WRAS approved mini expansion vessel must be made.

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WARNING
Appliance category: II2H3P (gas G20 20 mbar, G31 37 mbar)
Country of destination: United Kingdom (GB) Ireland (IE)
This appliance conforms with the following EEC directive:
Regulation (EU) 2016/426 on appliances burning gaseous fuels
Efciency Directive 92/42/EEC
Electromagnetic Compatibility Directive 2014/30/EU
Low Voltage Directive 2014/35/EU
Ecodesign Requirements Directive 2009/125/EC
The manufacturer, in the continuous process to improve his products, reserves the right to modify the data expressed
in the present documentation at any time and without prior notice.
The present documentation is an informative support and it can not be considered as a contract towards third parties.
Installing the boiler...
You must ensure that you remove the transit caps and plugs from the boiler connections
which are tted to every boiler.
Keep the boiler clear of dust during installation and in particular do not allow any dust or
debris to enter the top of the boiler where the ue connection is made. It is recommended
that you put a dust sheet over the top of the boiler until you are ready to make the ue
connection.
Remember to release the auto air purge valve on the pump assembly before lling the
boiler. See the instructions to identify the location of this device.
This boiler allows you to control the ow temperature of the central heating system at very
low levels. For underoor heating system a temperature limiting device (e.g. a safety ther-
mostat) is recommended to stop the boiler in case that the water temperature exceeds
the design temperature.
You are strongly advised to ush out the system both hot and cold in order to remove any
system and installation debris to the British Standard BS 7593 code of practice.
It is also sensible to initially re and commission the boiler before connecting any external
controls such as a room thermostat. By following this procedure, if you have a subse-
quent problem this method can eliminate the external controls from your fault analysis.
Some products incorporate an anti cycling time delay. It is normal when rst switching the
boiler on for the boiler to operate on heating for a few seconds then switch off. After 3 - 4
minutes has elapsed the boiler will then re ignite and operate perfectly normally. The igni-
tion delay cycle does not prevent normal operation of the boiler to provide D.H.W.
If you are in any doubts as to the installation or operation of the boiler please read the
instruction manuals thoroughly and then if necessary contact Biasi UK for advice and as-
sistance.
Guarantee conditions.
The guarantee registration form must be returned within 30 days of purchase, failure to
comply will invalidate the guarantee.
Electrodes disclaimer. Note to service engineers: It is required that the burner seal, lip
seal and mixing chamber seal along with the ame detection electrode are inspected
every year and replaced every 24 months. Failure to inspect the ame detection probe,
seals and replace as required may render the guarantee void.
Please remember that if you are in any doubt about the installation of this product you can
contact our Technical Help line on tel. [phone].

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TABLE OF CONTENTS
1 APPLIANCE DESCRIPTION ............ 8
1.1 Overview............................... 8
1.2 Isolation valves .......................... 8
1.3 Control panel ........................... 9
1.4 LCD general features .................... 10
2 INSTRUCTIONS FOR USE . . . . . . . . . . . . 12
2.1 Warnings.............................. 12
2.2 Relling procedure ...................... 12
2.3 Ignition ............................... 13
2.4 C.H. circuit temperature .................. 14
2.5 D.H.W. temperature ..................... 15
2.6 Switching off ........................... 16
3 USEFUL ADVICE.................... 17
3.1 Central Heating......................... 17
3.2 Frost protection......................... 17
3.3 Condensate drain ....................... 17
3.4 Periodic maintenance .................... 17
3.5 External cleaning ....................... 18
3.6 Operational faults ....................... 18
3.7 Displaying in INFO mode ................. 19
3.8 Flue probe and safety thermal fuse ......... 20
4 TECHNICAL INFORMATION........... 21
4.1 Overview.............................. 21
4.2 Main diagram .......................... 22
4.3 Technical data BASICA COND 24C
(M275V.2024 SM)....................... 24
4.4 Technical data BASICA COND 28C
(M275V.2428 SM)....................... 28
4.5 Technical data BASICA COND 32C
(M275V.2832 SM)....................... 32
4.6 Hydraulic specications .................. 36
4.7 Expansion vessel ....................... 36
5 GENERAL REQUIREMENTS .......... 37
5.1 Related documents...................... 37
5.2 Location of appliance .................... 37
5.3 Flue system ........................... 38
5.4 Gas supply ............................ 39
5.5 Air supply ............................. 40
5.6 Ventilation ............................. 40
5.7 Condensate drain ....................... 40
5.8 Water circulation (C.H.) .................. 41
5.9 Domestic water......................... 42
5.10 Water treatment ........................ 42
5.11 Electrical supply ........................ 43
6 INSTALLATION ..................... 44
6.1 Warnings ............................. 44
6.2 Precautions for installation ................ 44
6.3 Installing the bracket..................... 45
6.4 Overall dimensions ...................... 46
6.5 Joints ................................ 46
6.6 Mounting the boiler ...................... 46
6.7 Fitting the ue system.................... 47
6.8 Choice of ue .......................... 47
6.9 Electric connection ...................... 50
6.10 Connecting the room thermostat or zone valves 51
6.11 Installation of the external temperature probe . 52
6.12 Electric connection between the boiler and the
external probe.......................... 52
6.13 Remote electric connection (optional) ....... 53
6.14 Example of hydraulic systems with hydraulic
separator ............................. 53
7 COMMISSIONING . . . . . . . . . . . . . . . . . . . 54
7.1 Warnings.............................. 54
7.2 Electrical installation ..................... 54
7.3 Gas supply installation ................... 54
7.4 Filling the D.H.W. system . . . . . . . . . . . . . . . . . 54
7.5 Initial lling of the system ................. 54
7.6 Condensate pipe and traps ............... 56
7.7 Checking the gas supply pressure .......... 56
7.8 Checking the inlet pressure ............... 57
7.9 Lighting the boiler ....................... 57
7.10 Checking the ignition device ............... 59
7.11 Checking the ue system ................. 59
7.12 Checking the condensate drain pipe ........ 59
7.13 Instructing the user ...................... 59
8 ADVANCED COMMISSIONING ........ 61
8.1 Access parameters for installer ............ 61
8.2 Enabling of operation with remote control
(optional).............................. 61
8.3 Setting the K coefcient of the external
temperature probe ...................... 62
8.4 Selecting the maximum heating temperature
setpoint with climatic curve set ............. 64
8.5 Selecting the heating temperature set ....... 65
8.6 Setting the pump post-circulation ........... 66
8.7 Selecting the reignition frequency .......... 66
8.8 Factory reset........................... 67
8.9 Settings for changing the control board ...... 68
9 GAS CONVERSION ................. 72
9.1 Warnings.............................. 72
9.2 Operations and gas setting................ 72
10MAINTENANCE..................... 74
10.1 Warnings.............................. 74
10.2 Programming the maintenance period ....... 74
10.3 Dismantling the external panels ............ 75
10.4 Reassembly the external panels ........... 76
10.5 Emptying the D.H.W. system .............. 76
10.6 Emptying the C.H. system ................ 76
10.7 Cleaning the condensing primary exchanger
and the burner ......................... 76
10.8 Check the pressure of the heating expansion
vessel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 78
10.9 Cleaning the domestic hot water exchanger .. 78
10.10 Checking the ue system ................. 78
10.11 Combustion analysis check ............... 78
10.12 Checking the condensate drain pipe ........ 79
10.13 Visual inspection of appliance ............. 80
10.14 Checking the gas supply pressure .......... 80
10.15 Water inhibitor concentration .............. 80
10.16 Setting the boiler ue sweep function........ 80
11BENCHMARK COMMISSIONING &
WARRANTY VALIDATION SERVICE
RECORD .......................... 82
Gas boiler system commissioning checklist &
warranty validation record ................ 83
Service & interim boiler work record......... 84
Abbreviations used in the manual:
C.H. = Central heating
D.H.W. = Domestic hot water
D.C.W. = Domestic cold water

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USE
APPLIANCE DESCRIPTION
1 APPLIANCE DESCRIPTION
1.1 Overview
The model and serial number of the boiler is
shown on the bottom of the boiler.
Fig. 1.1
1
1 Controls panel
1.2 Isolation valves
Install a shut-off cock for the
D.H.W. inlet.
The gures in this manual only
show one of the possible ways
of installing cocks, pipes and t-
tings.
Fig. 1.2
2
4
35
6
8
10
9
7
11
2 Gas supply label
3 Condensate drain pipe
4 C.H. ow valve
5 D.H.W. outlet pipe
6 Gas inlet valve
7 C.H. pressure relief valve pipe
8 D.C.W. inlet valve
9 Main circuit drain valve
10 C.H. return valve
11 Model and serial number of the boiler
label

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USE
APPLIANCE DESCRIPTION
1.3 Control panel
Fig. 1.3
12
13
14
15
16
1718
12 D.H.W. temperature increase key
13 D.H.W. temperature reduce key
14 LCD display
15 C.H. temperature reduce key
16 C.H. temperature increase key
17 Stand-by/Winter/Summer key
18 Reset key

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USE
APPLIANCE DESCRIPTION
1.4 LCD general features
For the boiler technical information refer to
the section "TECHNICAL INFORMATION"
on page 21.
Fig. 1.4
bar
RESET
KEY
The symbol indicates a volatile
error. The boiler is reactivated
automatically once the fault
has been resolved
The symbol indicates that the
boiler can be restarted directly
by the user by pressing the re-
set button
Next maintenance period ex-
piring.
Enter the "INFO mode" to view
the remaining weeks before
maintenance is due
All symbols with lines radiat-
ing from them indicate that the
symbol is ashing
SIGNAL DISPLAYED BY THE LCD
LCD FUNCTION
E01 + Safety lockout due to
failed ignition
E02 + Lockout due to safety
thermostat
E03 + EEPROM error
E04 +
Pump circulation failure
or insufcient system
pressure
E05 + Fan control anomaly
E06 +
Heating NTC probe fail-
ure
E07 +
DHW NTC probe fail-
ure
E08 +
External NTC probe
failure
E09 +
Flue gas NTC probe
failure (interruption)
E10 +
Lockout due to tripping
of the ue gas probe
E11 + Parasite ame
E12 +
Return NTC probe fail-
ure
E13 +
Central Heating pres-
sure high
E14 +
Temperature gradi-
ent circulation failure
(>2K/s)
E22 +
Heating delivery tem-
perature between 90°C
and 100°C
E25 + Boiler in antifreeze
E26 + Gas valve fault
E28 + Tank NTC probe failure
E50 +
Communication with
remote control lost
E52 + Maximum number of
remote unlock attempts

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USE
APPLIANCE DESCRIPTION
LCD FUNCTION
E54 +
Filling function of C.H.
water completed, but
pressure is lower than
the minimum pressure
for boiler lling
E58 +
Filling function of C.H.
water completed, but
pressure is higher than
the maximum pressure
for boiler lling
Boiler off, (antifreeze
protection active)
Boiler in winter (heat-
ing/DHW) and stand-by
Boiler in summer (DHW
only) and stand-by
Boiler with DHW power
request.
The DHW temperature
is displayed.
Boiler with heating
power request.
The temperature of the
primary heating circuit
is displayed.
Burner ignition
(discharge)
Flame detected
(burner ignited)
Boiler in DHW anti-
freeze phase (the
symbol ashes)
LCD FUNCTION
Boiler in heating anti-
freeze phase (the
symbol ashes)
Heating set tempera-
ture
(all other symbols are
disabled)
DHW set temperature
(all other symbols are
disabled)
Boiler in chimney
sweep function.
To activate the chim-
ney sweep function, set
“parameter P06≠0”.
1 = minimum power
2 = maximum power
During the chimney
sweep function, the
and/or symbols
do not ash.

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USE
INSTRUCTIONS FOR USE
2 INSTRUCTIONS FOR USE
2.1 Warnings
Biasi UK Ltd support the Benchmark
initiative. The Benchmark Checklist is
located at the back of this manual and
should be completed by the Installing/
Commissioning Engineer and handed
over to the User for future reference by
other visiting Engineers.
Also included is the Service Interval Re-
cord card that should be completed by
the Service Engineer following the an-
nual service maintenance of the boiler
and system.
All Gas Safe Registered Installers carry
a Gas Safe ID card, and have a registra-
tion number. Both should be recorded
in your Benchmark Checklist. You can
check your Installer is registered by call-
ing Gas Safe direct on 0800 408 5500,
or go on line at www.GasSafeRegister.
co.uk.
In order to guarantee safety and correct op-
eration, it is essential that all the tests are
carried out by a competent and responsi-
ble service engineer before lighting up the
boiler.
The tests are described in the installation
instructions in section 7 commissioning.
Ensure that the C.H. circuit is regularly lled
with water (even if the boiler is only used for
D.H.W. supply).
If the pressure reading on the display is be-
low that shown in Fig. 2.4, then the system
will require topping up. A lling loop is nor-
mally provided by the Installer for this pur-
pose.
If you are in any doubt regarding this
procedure you are advised to contact
your Installer or an Approved Engineer.
This appliance is provided with a built in
anti-freeze system that operates the boiler
when the temperature is below 5 °C.
Therefore, when the boiler is not lit or used
in cold weather, with consequent risk of
freezing do not switch off the boiler at the
fused spur isolation switch or close the gas
inlet cock.
When you do not expect to use the boiler
for a long period and the boiler is not to be
used for frost protection then follow the in-
structions given in section "Switching off" on
page 16.
2.2 Relling procedure
• Isolate the boiler from the electrical sup-
ply at the fused spur. Reconnect the lling
loop as demonstrated in Fig. 2.1.
Fig. 2.1
Control
valve
Double
check valve
Temporary
connection
Supply pipe
(cold water
inlet) Control valve
C.H. return pipe
• To access INFO mode, press 18 (Fig. 2.2)
and hold for 5 seconds until the code n02
shows on the display (Fig. 2.3).
Fig. 2.2
12
13
14
15
16
1718

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USE
INSTRUCTIONS FOR USE
Fig. 2.3
bar
RESET
• Press button 12 (increase) to scroll
through the values the values until the
display shows code n10 "central heating
water pressure" appears on the display
and the pressure value 1.3 bar (Fig. 2.4).
Fig. 2.4
bar
RESET
bar
RESET
• Open the valves on the lling loop and, at
the same time, check the heating circuit
pressure on the display.
The pressure must be between 1 bar and
1.5 bar (e.g. 1.3 bar in (Fig. 2.4).
Once done, close the valves on the lling
loop.
If you experience any difculty with the
operation of the boiler, switch off the
boiler immediately at the fused spur iso-
lation switch and contact your Installer
or an approved Service Engineer.
Air introduced into the boiler during this ll-
ing process will vent through the automatic
air purger tted to the boiler. You may also
nd it necessary to vent air from your radia-
tor circuit using your radiator key, however
be aware that excessive venting will cause
the pressure in the system to drop.
Always ensure that the pressure is set at
the required pressure.
2.3 Ignition
• Check that the valves located in the lower
part of the boiler are open Fig. 2.5.
Fig. 2.5
Open
position
• Power the boiler by turning on the two-
way switch tted during installation. The
LCD display shows the OFF status (only
the heating and DHW antifreeze functions
are active) Fig. 2.6.
Fig. 2.6
bar
RESET

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USE
INSTRUCTIONS FOR USE
C.H. / D.H.W. functioning
• Press the key 17 and hold until both
and symbols appear on the display
Fig. 2.7.
Fig. 2.7
12
13
14
15
16
1718
The LCD display shows the stand-by status
and the and symbols Fig. 2.8.
Fig. 2.8
bar
RESET
Hot water production functioning only
• Press the key 17 until the symbol
appears on the display Fig. 2.9.
Fig. 2.9
12
13
14
15
16
1718
The LCD display shows the stand-by status
and the symbol Fig. 2.10.
Fig. 2.10
bar
RESET
2.4 C.H. circuit temperature
The output temperature of C.H. water can
be adjusted by pressing keys 15 (reduce)
and 16 (increase) (Fig. 2.9) from a minimum
of about 25°C to a maximum of about 85°C
or from a minimum of about 50°C to a maxi-
mum of about 80°C or from a minimum of
about 25°C to a maximum of about 55°C
(see "Selecting the heating temperature
set" on page 65). Press one of the two
keys once to display the "set" value. Press
again to access the modication.
Signal given by the LCD display:
• The heating ow "set" temperature and
the symbol ash. The background of
the display is illuminated (Fig. 2.11).
Fig. 2.11
bar
RESET
Adjustment of temperature WITHOUT
the external temperature probe (option-
al) tted
Adjust the C.H. water ow as follows:
• from 25 to 35 with an external tempera-
ture included between 5 and 15°C
• from 35 to 60 with an external tempera-
ture included between -5 and +5°C

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USE
INSTRUCTIONS FOR USE
• from 60 to 80 with an external tempera-
ture less than -5°C.
Your installer can recommend the best suit-
ed settings for your heating system.
The set temperature has been reached
when the symbol is not visible on the
LCD display.
Power request in C.H. power.
When the boiler has a call for heat in the
C.H. mode, the symbol is displayed on
the display followed by an increase of the
C.H. water ow temperature. The sym-
bol ashes (Fig. 2.12).
Fig. 2.12
bar
RESET
Adjusting the C.H. temperature with the
external temp. probe installed
When the external temp. probe (optional)
is installed your boiler automatically adjusts
the temperature of the C.H. system water
ow in relation to the external temperature.
In this case the boiler must be set by a qual-
ied installer (see "Setting the K coefcient
of the external temperature probe" on page
62).
However, if the ambient temperature is not
comfortable, the ow temperature of the
heating system can be adjusted by ± 15°C
by pressing on keys 15 (reduce) and 16 (in-
crease) (Fig. 2.9).
2.5 D.H.W. temperature
The temperature of the D.H.W. can be ad-
justed by pressing keys 12 (increase) and
13 (reduce) (Fig. 2.9) from a minimum of
about 30°C to a maximum of about 60°C.
Press one of the two keys once to display
the "set" value. Press again to access the
modication.
Signal given by the LCD display:
• the "set" value of the D.H.W. and the
symbol ash. The background of the dis-
play is illuminated. (Fig. 2.13).
Fig. 2.13
bar
RESET
Adjustment
Adjust the D.H.W. temperature to a value
suited to your needs.
Reduce the necessity of mixing hot water
with cold water.
In this way, the automatic adjustment fea-
tures will be appreciated.
If water hardness is particularly high, we
recommend that the boiler be adjusted to a
temperature of less than 50°C.
However in these cases we recommend
that a softener is installed on the domestic
cold feed.
D.H.W. request
When the boiler has a power request in the
D.H.W. mode, the symbol is displayed
on the display followed by an increase of
the heating water ow temperature. The
symbol ashes (Fig. 2.14).
Fig. 2.14
bar
RESET

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USE
INSTRUCTIONS FOR USE
2.6 Switching off
Press the key 17 (Fig. 2.15) until the mes-
sage OFF appears on the LCD display (Fig.
2.16).
Fig. 2.15
12
13
14
15
16
1718
Fig. 2.16
bar
RESET
In OFF mode, the antifreeze protection is
active.
If a long period of inactivity is envisioned:
• Switch off the electricity supply to the boil-
er, by means of the fused spur isolation
switch;
• Shut off the gas supply cock and the
valves for the water circuits tted under
the boiler Fig. 2.17;
Fig. 2.17
Close
position
• If necessary, empty the hydraulic circuits
see section "Emptying the D.H.W. sys-
tem" on page 76 and section "Emptying
the C.H. system" on page 76.

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USE
USEFUL ADVICE
3 USEFUL ADVICE
3.1 Central Heating
For your comfort and added system control,
you can install a room thermostat but you
should not shut off the radiator in that room
or have a TRV tted on the radiator.
If a radiator (or a convector) does not heat
up, check that no air is present in it and that
its valve is open. If the ambient temperature
is too high, do not alter the radiator valves.
Reduce the central heating temperature in-
stead by means of the room thermostat or
by pressing the 15 and 16 heating adjust-
ment keys (Fig. 3.1).
Fig. 3.1
12
13
14
15
16
1718
3.2 Frost protection
The built in anti frost system protects the
boiler from frost damage but does not pro-
vide any protection for the system, an op-
tional external frost protection thermostat
can be added and a dedicated connection
point is available on the electrical connec-
tion block.
The antifreeze function is active even if the
boiler is in OFF (Fig. 3.2).
Fig. 3.2
bar
RESET
Therefore, when the boiler is not lit and
used in cold weather, with consequent risk
of freezing do not switch off the boiler at the
fused spur isolation switch or close the gas
inlet cock.
If the boiler is deactivated, have a qualied
technician empty the boiler (heating and
domestic hot water circuit), the C.H. system
and the D.H.W. system.
3.3 Condensate drain
The condensate drain must not be modi-
ed or blocked. Blockage of the condensate
drain, caused by debris or freezing, can
cause automatic shutdown of the boiler. If
freezing is suspected and the pipe run is ac-
cessible an attempt may be made to free
the obstruction by pouring hot water over
the exposed pipe an cleaning any blockage
from the end of the pipe.
If this fails to remedy the problem the assis-
tance of a Gas Safe registered installer or
in IE a competent person should be sought.
3.4 Periodic maintenance
For efcient and continuous operation of
the boiler, it is advisable to arrange mainte-
nance and cleaning by an Authorised Ser-
vice Centre Engineer, at least once a year.
During the service, the most important
components of the boiler will be inspected
and cleaned. This service can be part of a
maintenance contract. In particular, you are
advised to have the following checks car-
ried out:

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USE
USEFUL ADVICE
• domestic hot water heat exchanger;
• condensing heat exchanger;
• burner;
• exhaust fume duct and ue;
• pressurisation of the expansion tank;
• lling up of the central heating circuit;
• bleeding of air from the central heating
system;
• general check of the appliance’s opera-
tion.
Please refer to the servicing information on
section "MAINTENANCE" on page 74.
3.5 External cleaning
Before carrying out any clean-
ing, disconnect the appliance
from the electrical mains, using
the fused spur isolation switch
tted adjacent to the appliance.
To clean the external panels, use a cloth
soaked in soapy water. Do not use solvents,
abrasive powders or sponges.
Do not carry out cleaning of the appliance
and/or its parts with readily ammable sub-
stances (for example petrol, alcohols, naph-
tha, etc.).
3.6 Operational faults
If the boiler is not working and an error code
ashes on the display and the symbol is
shown, it is a volatile lockout. The boiler is
reactivated automatically once the fault has
been resolved (see "LCD general features"
on page 10); the boiler is in lockout mode.
The display background ashes (Fig. 3.3).
Fig. 3.3
bar
RESET
Each fault is classied accord-
ing to the level of priority. If
more than one faults are detect-
ed at the same time, the most
urgent error code is shown.
Frequent safety lockouts should
be reported to an authorised
service centre.
Other operational faults signalled on the
LCD display
If an error code, the symbol and the
symbol are shown on the LCD dis-
play, the lockout is NOT volatile (Fig. 3.4).
Fig. 3.4
bar
RESET
To restore operation, press the reset button
18 (Fig. 3.1) on the boiler control panel.
Noise due to air bubbles are heard dur-
ing operation
You should check that the pressure on the
pressure gauge is not below the correct set-
ting.
If required, top up the system correctly, as
described in the section "Relling proce-
dure" on page 12 of this manual. Bleed
any air present in the radiators, if necessary.
The pressure has gone down
It is necessary to top up the appliance with
water again, so as to raise the pressure to
an adequate level as described in the sec-
tion "Relling procedure" on page 12 of
this manual. If topping up with water has to
be done very frequently, have the system
checked for leaks.

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USE
USEFUL ADVICE
Water comes out of the pressure relief
valve
Check if the lling cock is closed tightly (see
"Relling procedure" on page 12).
Check on the pressure gauge that the pres-
sure in the central heating circuit is not
close to 3 bars. In this case, temperature
rise in the circuit can cause the pressure
relief valve to open. So that this does not
happen and to decrease the pressure to a
normal value, it is advisable to vent some of
the water in the appliance through the bleed
valves present in the radiators.
Reduced domestic hot water tempera-
ture
The likely causes may be impurities caught
in the domestic hot water ow switch lter or
limescale deposited in the domestic hot wa-
ter heat exchanger. It is advisable to have
the appliance cleaned out by an Authorised
Service Centre Engineer.
Should occasionally leak from the boiler
Shut off the valves positioned under the
boiler to page 16 and call an Authorised
Service Centre Engineer.
In this case or in case of prob-
lems other than those men-
tioned here, switch off the boil-
er, as described in section
"Switching off" on page 16
and call a competent and re-
sponsible Service Engineer.
3.7 Displaying in INFO mode
The INFO mode allows the display of some
information on the boiler functioning status.
In case of malfunctioning of the boiler, it may
be useful to communicate such information
to the Authorised Service Centre Engineer
so that the causes can be understood.
To access INFO mode, press key 18 (Fig.
3.5) and hold for 5 seconds until the code
n02 shows on the display (Fig. 3.6).
Fig. 3.5
12
13
14
15
16
1718
Fig. 3.6
bar
RESET
To scroll the values press 12 (previous
INFO) and 13 (next INFO) keys.
To exit INFO mode, either:
• press and hold the 17 key for 5 seconds
(Fig. 3.5) (one level up).
The table summarises the possible values
visible in INFO mode.
Table of
contents
Value shown
n02 DHW output temp.
n03 NTC return temperature (not
present)
n04 Flue gas temperature (not
present)
n05 Outdoor temperature
n08 Maximum set fan speed
(RPM/100)

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USE
USEFUL ADVICE
n10 Central heating water pres-
sure
n09 (not used)
n11 Flow rate
n14 PWM pump speed
percentage
n15 Fan speed (RPM/100)
n20 (not used)
n21 Last error code
n22 Second-to-last error code
n26 Calculated heating set
point (with climatic curve or
congured set)
n29 Number of weeks to
maintenance
3.8 Flue probe and safety thermal
fuse
If the ue thermal cut-off fuse is
triggered, the boiler goes into
safety lockout. To restore nor-
mal boiler operation, please
contact an Authorized Service
Centre.
The ue probe and safety thermal fuse 19
indicated in Fig. 3.7 are a safety device. The
ue probe 19 intervenes when the ue tem-
perature exceeds 110°C placing the boiler
in safety block switching it off.
To reset normal boiler functioning, just press
the 17 (Fig. 3.5) key.
If ue probe 19 does not intervene and,
therefore does not send the boiler into secu-
rity lockout, ue thermal fuse 19 is triggered
as an additional safety device to protect the
ue outlet pipe.
To restore the normal operation of the boil-
er, contact the Authorized Service Centre.
Fig. 3.7
19