Daikin D2CNL024A1AA User manual

Operation manual
Wall-mounted condensing boiler srpski
Operation manual
Wall-mounted condensing boiler
D2CNL024A1AA

Table of contents
Operation manual
2
D2CNL024A1AA
Wall-mounted condensing boiler
3P469438-12N – 2020.07
Table of contents
1 Introduction 2
1.1 About the unit ............................................................................ 2
1.2 About the documentation .......................................................... 2
1.2.1 Meaning of warnings and symbols.............................. 2
2 Safety instructions 2
2.1 Installation ................................................................................. 2
2.2 Smell of gas............................................................................... 3
2.3 Modifications on the unit............................................................ 3
2.4 For the user ............................................................................... 3
3 Operacije 3
3.1 User interface ............................................................................ 3
3.1.1 Buttons........................................................................ 3
3.1.2 LCD screen................................................................. 4
3.2 Operating the unit...................................................................... 4
3.2.1 To switch the unit ON.................................................. 4
3.2.2 About the low water temperature function .................. 4
3.3 Osnovna upotreba..................................................................... 4
3.3.1 About the home screen............................................... 4
3.3.2 To select the operation mode ..................................... 4
3.3.3 Possible operation modes........................................... 4
3.3.4 Changing temperature setpoints................................. 5
3.3.5 Possible central heating operation modes.................. 6
3.3.6 About the central heating ECO mode ......................... 6
3.3.7 About the domestic hot water operation ..................... 6
3.3.8 About the domestic hot water comfort mode .............. 6
3.3.9 About the boiler frost protection.................................. 6
3.4 Error handling............................................................................ 6
3.5 Menu functions .......................................................................... 7
3.5.1 To use menu level 1.................................................... 7
3.5.2 Info menu.................................................................... 7
3.5.3 User settings menu..................................................... 7
3.5.4 Installer settings menu................................................ 8
4 Maintenance and cleaning 8
4.1 To clean the outer surface of the unit........................................ 8
5 Energy saving tips 8
6 Contact 8
7 Error codes 8
1 Introduction
1.1 About the unit
This Daikin unit is a wall-mounted gas-fired condensing boiler that
can supply heat to central heating systems, as well as supply
domestic hot water. Depending on settings, it is possible to use the
unit solely for hot water or solely for central heating. Hot water
supply type can be instantaneous or by means of a hot water
storage tank. Heating only boilers do not supply domestic hot
water. The type of the boiler can be recognized from the model
name written on the identification label. See table below:
Model Type Domestic hot water
supply
Filling loop
D2CNL024A1AA D2CNL024 Instantaneous Internal
A control unit, which contains a user interface, controls the ignition,
safety systems, and other actuators. User interaction is provided via
that user interface, which is composed of an LCD screen and
buttons which is located on the front cover of the unit.
1.2 About the documentation
The instructions contained in this document are intended to guide
you through the operation of the unit. Damage caused by non-
observance of these instructions are not under the responsibility of
Daikin.
▪ Originalna dokumentacija je napisana na engleskom jeziku. Svi
drugi jezici su prevodi.
▪ The precautions described in this document are written for users
and cover very important topics, follow them carefully.
▪ Please read the instructions in the manual carefully, for your
safety and health.
▪ Please keep this manual for future reference throughout the unit's
period of use.
▪ Request the installer to inform you about the settings that he
made to configure your system.
1.2.1 Meaning of warnings and symbols
OPASNOST
Ukazuje na situaciju koja dovodi do smrti ili teške povrede.
UPOZORENJE
Ukazuje na situaciju koja može da dovede do smrti ili teške
povrede.
OPREZ
Ukazuje na situaciju koja može da dovede do manje ili
umerene povrede.
OBAVEŠTENJE
Ukazuje na situaciju koja može da dovede do oštećenja
opreme ili imovine.
INFORMACIJA
Ukazuje na korisne savete ili dodatne informacije.
2 Safety instructions
Always observe the following safety instructions and regulations.
2.1 Installation
UPOZORENJE
Installation, service, maintenance and repair of the boiler
can only be carried out by suitably qualified competent
persons, in accordance with the applicable legislation,
regulations, rules and guidelines.
UPOZORENJE
The unit may only be operated with its casing properly
mounted. Otherwise, in unfavourable conditions, material
damage or even injury or death can result.
OPREZ
A discharge pipe must be connected to the condensate
trap in order to prevent contact with the condensate.
In case your skin comes into contact with condensate, the contact
location should be washed with plenty of water. Condensate liquid
may NEVER be used for purposes of cleaning, watering plants, or
drinking.

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D2CNL024A1AA
Wall-mounted condensing boiler
3P469438-12N – 2020.07
2.2 Smell of gas
OPASNOST
This is a gas unit. Gas leaks might lead to poisoning and
explosions.
If you smell gas:
▪ Do not use any electrical switches, including light switches.
▪ Do not use telephones in the affected area.
▪ Do not use naked flames, such as matches or lighters.
▪ Do not smoke.
▪ Turn off the main gas supply.
▪ Open windows and doors.
▪ Warn other people in the building.
▪ Get out of the building.
▪ Inform your gas supplier, service agent or other competent
person.
2.3 Modifications on the unit
OPASNOST
Malfunctions can lead to poisoning and explosions. Never
put the safety devices out of operation, nor tamper with
them so as to impair their function.
OPREZ
An inappropriate modification may cause damage. Never
tamper with the boiler or other parts of the system. Never
attempt to perform maintenance or repair yourself. Call a
qualified service agent.
OPREZ
Do not use sprays, solvents, chlorinated cleaning agents,
paint, and adhesives in the vicinity of the unit. These
substances can cause corrosion, even in the flue system.
OPASNOST
Do not damage or remove any seals on components. Only
qualified persons are allowed to alter sealed components.
Do not make any modifications on:
▪ Boiler
▪ Gas, water or power supply
▪ Flue system
2.4 For the user
OPREZ
Any misuse is forbidden. The manufacturer is not
responsible for any malfunctions and/or damage that may
occur due to misuse.
▪ Your unit is intended as a heater for central heating systems and
for domestic hot water generation. Any other use is considered as
"misuse".
▪ If you are not sure how to operate the unit, contact your service
agent.
▪ Ovaj uređaj mogu koristiti deca starosti 8 godina i više, osobe sa
smanjenim fizičkim, čulnim ili mentalnim sposobnostima, ili sa
nedostatkom iskustva i znanja, ako su pod nadzorom ili su dobili
uputstva za upotrebu uređaja na bezbedan način, i razumeju
opasnosti koje postoje. Deca NE SMEJU da se igraju uređajem.
Čišćenje i korisničko održavanje NE SMEJU obavljati deca bez
nadzora.
OPREZ
Do NOT rinse the unit. This may cause electrical shock or
fire.
OBAVEŠTENJE
▪ Do not place any objects or equipment on top of the
unit.
▪ Do not sit, climb or stand on the unit.
UPOZORENJE
Ako je napojni kabl oštećen, on MORA da bude zamenjen
od strane proizvođača, njegovog zastupnika ili slično
kvalifikovane osobe, da bi se izbegla opasnost.
3 Operacije
3.1 User interface
a
g
b
c d
e
f
aCH+
bCH-
cMode / Enter / Reset
dMenu / Back
eDHW-
fDHW+
gLCD Screen
3.1.1 Buttons
The 6 buttons on the user interface have various functions according
to different situations, which are stated in the table below:
Button/Dial Function Description
Mode /
Enter /
Reset
Mode Change mode between summer,
winter, central heating only and
standby.
Reset Reset the lockout error.
Enter Passing on to the next level in the
menu structure.
Confirm Confirmation of changes.
Menu / Back Menu Enter the menu function.
Back Go back to the parent menu.
Cancel Cancel changes.

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3P469438-12N – 2020.07
Button/Dial Function Description
CH+ / CH- User
interaction
level
Central heating temperature setpoint.
This is either the central heating flow
temperature, the room temperature,
or the virtual room temperature,
depending on the system
configuration.
Menu level Selection of info, user, service menu.
DHW+ /
DHW-
User
interaction
level
Domestic hot water temperature
setpoint.
Menu level ▪ Selection parameter index.
▪ Change parameter values.
3.1.2 LCD screen
LCD screen is the monitor of the user interface. You can see the
boiler operation mode, setpoints, information about actuators and
menu parameters on this screen.
The LCD screen has a sleeping function. After one minute of non-
interaction with the user interface, the screen darkens. Pressing any
button or rotating any dial awakens the display.
When you interact with the user interface, the LCD screen will show
the home screen of the active operation mode and the related
setpoint, depending on the system configuration (see "Possible
operation modes"[44]).
Status icons
Meaning of icons that appear on the LCD screen:
Icon Description
Operation mode: Standby mode
Domestic hot water operation enabled
Domestic hot water comfort mode is enabled
Central heating operation enabled
Room temperature
Outdoor sensor connection
Central heating ECO mode enabled
Flame
Info menu
User settings menu
Service settings menu
3.2 Operating the unit
3.2.1 To switch the unit ON
1Connect the unit to the main power supply.
2Select an operation mode by pressing the "Mode" button
shortly.
Usage of the unit is explained in following parts of this manual.
3.2.2 About the low water temperature function
The low water temperature function is a safety function that takes
place at first central heating operation after each power supply
interruption and at first central heating operation after each 90 days.
When this function is active, boiler operates according to a defined
set value for around 15 minutes and the icon blinks. After this
function is ended, normal operation goes on.
INFORMACIJA
Low water temperature function is a safety function and it
cannot be disabled.
3.3 Osnovna upotreba
3.3.1 About the home screen
It is the screen that is displayed after activating the LCD screen with
one of the buttons. You can use the home screen to read out
settings that are meant for daily use. What you can see on the home
screen depends on your system configuration.
The following home screens may be possible:
▪ Central heating set temperature
▪ Virtual room temperature (with outdoor sensor)
▪ Domestic hot water set temperature
▪ System pressure (at standby mode)
3.3.2 To select the operation mode
The operation mode can be changed by pressing the "Mode" button.
ac
b
d
aStandby mode
bSummer mode
cWinter mode
dCentral heating only mode
3.3.3 Possible operation modes
Operation mode Description
Central heating only mode ▪ Only central heating operation mode
is enabled.
▪ The central heating temperature
setpoint (which setpoint is shown
depends on the system
configuration; see "Possible central
heating operation modes" [4 6]
and the icon is shown on the
home screen.
▪ The icon is shown if central
heating operation is active.

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Wall-mounted condensing boiler
3P469438-12N – 2020.07
Operation mode Description
Standby mode ▪ Both central heating and domestic
hot water operation modes are
disabled.
▪ The protection functions such as
frost protection are still active at
standby mode.
▪ The home screen shows the system
pressure, as well as the icon.
Summer mode ▪ Only domestic hot water operation
mode is enabled. Central heating
operation mode is disabled. The
boiler will only produce heat for
domestic hot water.
▪ The domestic hot water setpoint,
and the icon is shown on the
home screen.
▪ The is shown if domestic hot
water operation is active.
Winter mode ▪ Both domestic hot water operation
mode and central heating operation
mode are enabled. The boiler can
produce domestic hot water, as well
as produce heat for central heating.
▪ The central heating temperature
setpoint (which setpoint is shown
depends on the system
configuration; see "Possible central
heating operation modes" [4 6],
and the icon, as well as the
icon are shown on the home screen.
When domestic hot water operation
is active, domestic hot water
setpoint is shown on the home
screen.
▪ The is shown and icon is
shown if domestic hot water
operation is active.
▪ The is shown and icon is
shown if central heating operation is
active.
3.3.4 Changing temperature setpoints
Temperature setpoints can be changed with the CH+, CH-, DHW+
and DHW- buttons.
To change the central heating temperature
setpoint
1Push CH+ or CH- buttons while you are at the home screen.
The setpoint screen will appear as shown below and the
setpoint can be adjusted by pushing CH+ or CH- buttons.
Napomena: The icon means you are at the setpoint screen.
2To apply changes done, wait for 3seconds or press the "Enter"
button. Pressing the "Cancel" button cancels the changes done.
To change the domestic hot water setpoint
1Push DHW+ or DHW- buttons while you are at the home
screen. The setpoint screen will appear as shown below and
the setpoint can be adjusted by pushing DHW+ or DHW-
buttons. Napomena: The icon means you are at the setpoint
screen.
2To apply changes done, wait for 3seconds or press the "Enter"
button. Pressing the "Cancel" button cancels the changes done.
OBAVEŠTENJE
To be able to change the setpoint of central heating or
domestic hot water, the corresponding operation mode
must be enabled. If it is not, the related dial has no
function.

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Wall-mounted condensing boiler
3P469438-12N – 2020.07
3.3.5 Possible central heating operation modes
Mode Description
Boiler only The case that the system only
contains the boiler. No outdoor sensor
is connected. The central heating
water temperature setpoint is
displayed. The setpoint can be
adjusted with CH+ or CH- buttons.
The icon is shown on the screen
when the central heating operation
mode is enabled.
Boiler + outdoor sensor
(Weather compensation)
The case that outdoor sensor is
connected to the boiler. In this case,
the central heating water temperature
is regulated according to the outdoor
temperature. The virtual room
temperature setpoint is diplayed. The
virtual room temperature setpoint can
be adjusted with CH+ or CH- buttons.
Increasing or decreasing the setpoint
value reflects to the central heating
water temperature and the room
temperature, respectively.
The and icons are shown on the
screen when central heating operation
mode is enabled.
OBAVEŠTENJE
To enable weather compensation, the heating slope value
must be higher than "0" (see "User settings menu:
Parameters (short)"[47]).
3.3.6 About the central heating ECO mode
The central heating ECO mode provides more economic central
heating. Main purpose of the ECO mode is to operate the boiler at
the condensing temperature range so to increase the efficiency.
ECO mode can be activated at any central heating operation mode
explained above.
ECO mode can be enabled from the user settings menu (see "User
settings menu: Parameters (short)"[47]).
INFORMACIJA
ECO mode is only for central heating, it has no effect to
domestic water heating.
When central heating ECO mode is enabled, icon is shown on the
screen while the central heating operation mode is enabled.
OBAVEŠTENJE
In case of bad or inappropriate central heating circuit
design, which causes inadequate heat emission to the
living space, activating the ECO mode may cause capacity
shortage.
3.3.7 About the domestic hot water operation
This unit supplies domestic hot water by way of a plate heat
exchanger.
Domestic hot water operation is activated when water is being
tapped. Water flow rate must be at least 2.6l/min.
The icon is shown when domestic hot water operation is active.
INFORMACIJA
Domestic hot water operation mode must be enabled for
the boiler to be able to produce domestic hot water. (i.e.
summer mode or winter mode).
3.3.8 About the domestic hot water comfort
mode
In this mode, water in the primary circuit is kept warm to be able to
provide domestic hot water faster when there is demand.
Comfort mode can be enabled from the user settings menu (see
"User settings menu: Parameters (short)"[47]).
When the domestic hot water comfort mode is enabled, the icon is
shown on the screen.
3.3.9 About the boiler frost protection
Frost protection safety system: This function protects the unit and
heating installation from frost damages. This protection activates the
boiler pump when the water temperature drops below 15°C and it
activates the burner when the water temperature drops below 5°C
(factory setting). The unit keeps running until the temperature
reaches 15°C. To enable this function, the unit must be connected to
the power supply and its main gas valve must be open. Any damage
caused by frost is not covered by the warranty. Frost Protection is
enabled in all modes, including standby mode and full-off mode.
While frost protection is active, actual flow temperature is displayed.
UPOZORENJE
If the boiler is not connected to the power supply, frost
protection is not active. Consequently, the water may
freeze and cause cracks. The manufacturer is not
responsible for any damage that may occur this way.
OBAVEŠTENJE
When not using the boiler, we strongly recommend not to
cut off the electric supply to the boiler.
3.4 Error handling
When an error occurs, the normal behaviour of the user interface is
interrupted. However, be aware that not all errors have the same
effect on the user interface and the status indicator.
Error
type
Boiler operation User interface and status
indicator
Warning Continue The LCD screen stays active and
displays the error code.
Blocking Blocked, turns back
to operation if
cause disappears
The LCD screen stays active and
displays the error code.
Lockout Blocked and a
reset is required
The LCD screen stays active and
displays the error code. Also, the
icon starts blinking, indicating that a
reset is required.
In case of a warning or a blocking error, the user interface will leave
error mode and return to the home screen when the cause of the
error disappears.
In case of a lockout error, the boiler needs to be reset. Press the
"Reset" button to remove the error, if the cause of the error is gone.
If the cause of the error is still there, the user interface will enter
error mode again. When the error is solved, the user interface
returns to the home screen.
If you or press any button (except the "Reset" button) during an
error, the user interface will display the home screen. After the
timeout without any interaction, instead of darkening, the user
interface will enter error mode.

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D2CNL024A1AA
Wall-mounted condensing boiler
3P469438-12N – 2020.07
INFORMACIJA
“Reset” button must be pressed for 3 seconds to remove
the error.
OBAVEŠTENJE
A table with all error codes, the reasons for their
appearance, and possible solutions, is located at the very
end of this manual.
3.5 Menu functions
3.5.1 To use menu level 1
1Press the "Menu" button while you are at home screen to go the
Menu screen. This is menu level 1 screen.
2To switch between info, user settings and service settings,
press CH+ and CH- buttons.
3To leave the menu and return to the home screen, press "Back"
button.
When there is no user interaction for one minute, the user interface
will leave the menu and switch to the blank screen.
3.5.2 Info menu
Info menu: Parameters
The info menu ( ) covers all possible information that is made
available to the end user and to the installer. This parameters are
read only and cannot be changed.
# Description (short) Unit
A0 Actual flow temperature °C
A1 Actual return temperature °C
A2 Actual domestic hot water temperature °C
A3 Actual flue temperature °C
A4(a) Actual outdoor temperature °C
A5(a) Actual solar temperature °C
A6 Actual water pressure bar
A7 Actual domestic hot water flow rate l/min
A8 Actual fan speed (rpm/100) rpm
A9 Current setpoint of boiler pump %
B0 Software version 0
B1 μ com ID low digit -
B2 μ com ID high digit -
B3 Ionisation current μA
(a) Not applicable if the sensor is not connected.
To use the info menu
1Press the "Enter" button when the icon is displayed on the
menu level 1 screen.
2Select the index number with DHW+ and DHW- buttons. Press
the "Back" button to return to menu level 1 screen.
3.5.3 User settings menu
User settings menu: Parameters (short)
The user settings menu ( ) comprises parameters that can be
changed and adjusted by users. You can read out and adjust the
parameters according to your preferences.
OBAVEŠTENJE
If you are not sure about the function of the parameter, do
not change it. Contact your service agent.
# Description Unit Default Range
U0 Summer-winter switch over
temperature
°C 20 10~30
U1 Heating slope — 0 0~40
U2 Central heating ECO mode — 0 0~1
U3 Domestic hot water comfort
mode
— 0 0~1
User settings menu: Parameters (detailed)
# Description
U0 When using outdoor sensor, above this parameter
value of outside temperature, the boiler senses the
season as summer and does not activate central
heating although there is demand. Summer-winter
switching has a hysteresis of ±1ºC.
i.e: When this parameter is adjusted to 20ºC, the boiler
switches to summer mode at 21ºC and switches back
to winter mode at 19ºC.
U1 This value is used when outside sensor is connected to
the boiler. The parameter heating slope is important to
adapt the weather compensation to the individual
heating system, the building and the thermal insulation.
The heating slope can be adjusted from 0 to 40. The
heating slope needs to be increased to increase the
boiler central heating set temperature. Colder
regions require a higher heating slope value.
Napomena: To activate weather compensation, the
heating slope value must be higher than "0".
U2 Enabling / disabling central heating ECO mode.
1 = enabled, 0 = disabled

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Operation manual
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Wall-mounted condensing boiler
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# Description
U3 Enabling / disabling domestic hot water comfort mode.
1 = enabled, 0 = disabled
To use the user settings menu
1Press the "Enter" button when the icon is displayed on the
menu level 1 screen.
Rezultat: You can see the parameter on menu level 2.
2Select the index with DHW+ and DHW- buttons.
3Press the "Enter" button when the parameter that you want to
change is displayed.
Rezultat: You can see the menu level 3 screen. Up and down
arrows will appear.
4Change the parameter with DHW+ and DHW- buttons.
5Press the "Enter" button to confirm or the "Cancel" button to
cancel. You will return to menu level 2 after pressing "Enter" or
"Back"
3.5.4 Installer settings menu
Only qualified persons are allowed to enter the installer settings
menu.
4 Maintenance and cleaning
UPOZORENJE
The boiler should be maintained by authorised persons
every year.
Annual maintenance cycle is very important for safe operation of
your boiler and to ensure reliable, efficient and long lasting operation
of it.
Contact your service agent for details.
OPASNOST
Incorrect maintenance and repairs can lead to injury and
material damage.
▪ Never attempt to perform maintenance work or repairs
on the unit yourself.
▪ Contact your service agent.
4.1 To clean the outer surface of the
unit
Clean the outer surface of your boiler with a damp cloth and a little
solvent-free soap.
OPREZ
Sprays, solvents or cleaning agents containing chlorine
can damage the exterior, the fittings or the control unit. Do
not use them for cleaning purposes.
5 Energy saving tips
▪ Operating the unit in central heating ECO mode provides the most
economical central heating operation conditions.
▪ Do not run the boiler in domestic hot water comfort mode.
Domestic hot water comfort mode involves pre- and post-heating,
which is luxury, not necessity.
▪ Close the thermostatic radiator valves when ventilating the rooms.
▪ The largest heat loss occurs through windows and outer doors.
Check windows and doors for air-tightness. Close any blinds at
night.
▪ Do not hide radiators behind large furniture (i.e. couch, desk, etc.).
Minimum 50 cm of clearance must remain, otherwise the heated
air cannot be circulated and the room will not heat up efficiently.
▪ Do not let your room become too hot. Decreasing the room
temperature during the day saves energy.
▪ Have your combi boiler's maintenance performed at least
annually.
▪ Provide your building with sufficient heat insulation.
▪ Thermostatic valves should be used. Each room should be
adjusted according to comfort conditions. For reception rooms,
this is 20°C, living rooms 22°C, kitchens 18°C and bedrooms
18°C.
▪ Prevent radiators from getting covered by curtains.
6 Contact
Contact a local competent service agent if you have any questions
regarding the maintenance and repair of your system. You can find
the contact information of our competent services at www.daikin.com
7 Error codes
# Problem Solution
10-64 Gas valve circuit error Perform reset. If problem repeats,
contact your service agent.
11-64 Ignition does not take
place
Make sure valve on the gas line is
opened. Perform reset after third
unsuccessful ignition trial.
11-67 Flame loss during
operation
Temporary error. Wait for boiler to
re-ignite.
13-64 Fan speed error Perform reset if needed. If problem
repeats, contact your service agent.
13-65 Fan speed error Perform reset. If problem repeats,
contact your service agent.
16-64 Flue temperature
signalise overheating
Check flue gas discharge path.
Perform reset if needed. If problem
repeats, contact your service agent.

7 Error codes
Operation manual
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D2CNL024A1AA
Wall-mounted condensing boiler
3P469438-12N – 2020.07
# Problem Solution
1J-64 High limit thermostat
signalise overheating
▪ Check the valves of the radiators
in the heating circuit.
▪ Check the combi boiler water
pressure. If it is low, fill the heating
circuit with water.
▪ Perform reset. If problem repeats,
contact your service agent.
80-01 Return temperature
sensor fault
Perform reset. If problem repeats,
contact your service agent.
81-01 Flow temperature
sensor fault
Perform reset. If problem repeats,
contact your service agent.
81-65 Domestic hot water
solar temperature
sensor fault
Boiler continues operation but solar
sensor is defective. Contact your
service agent.
8A-46 Freeze protection Unit does not operate if flow
temperature sensor reads value less
than 1°C. Wait until the error code is
removed from the screen.
8H-64 Flow temperature
steep rise
Make sure radiator valves are open
enough to circulate water. Your
boiler will operate again after a while.
If problem repeats, contact your
service agent.
8H-65 Flow-return
temperature
difference too much
Make sure radiator valves are open
enough to circulate water. If problem
repeats, contact your service agent.
E1-64 Flame detection
before burner
operation
Perform reset. If problem repeats,
contact your service agent.
E1-69 Parameter CRC error Perform reset. If problem repeats,
contact your service agent.
E1-71 EK lockout failure Permanent error. Contact your
service agent.
E1-73 Internal PCB error Perform reset if needed. If problem
repeats, contact your service agent.
H9-01 Outside sensor fault Boiler continues operation but
outside sensor is defective. Contact
your service agent.
HC-01 Domestic hot water
temperature sensor
fault
Boiler continues operation but you
must contact your service agent.
HJ-08 High system pressure Discharge water down to 0.8bar.
(You can bleed the radiators.)
HJ-09 Low system pressure Increase the system pressure to
0.8bar
HJ-10 Water pressure
sensor fault
Contact your service agent.
J6-01 Flow temperature
sensor overheating
(Can be a blocking
error or a lockout
error)
▪ Check the valves of the radiators
in the heating circuit.
▪ Check the combi boiler water
pressure. If it is low, fill the heating
circuit with water.
▪ Perform reset if needed. If problem
repeats, contact your service
agent.
J6-21 Return temperature is
higher than flow
temperature
No reset needed, burner operates
itself after a small amount of time. If
problem repeats, contact your
service agent.
JJ-64 Flue temperature
sensor fault
Perform reset. If problem repeats,
contact your service agent.
# Problem Solution
U4-67 Remote reset
supervision
Switch off - switch on power mains. If
problem repeats, contact your
service agent.

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3P469438-12N 2020.07
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