E.C.A. ARCEUS EC 6 kW MT User manual

ARCEUS
ELECTRIC COMBI BOILER
ARCEUS EC
6-9-12-15-18-24-27 kW MT / CH / ST
SERVICE MANUAL

TABLE OF CONTENTS
GENERAL WARNINGS..............................................................................................4
1. Device Control, Button Functions and Service Menus...................................... 5
1.1. Control Panel .............................................................................................................................5
1.2. Button Functions........................................................................................................................5
1.3. Introduction to Parameter, Information and Error History Menus...............................................6
1.4. Cable Diagrams by Capacities...................................................................................................9
1.5. Detailed View and List of Components ....................................................................................13
2.Error Codes and Solutions .................................................................................15
2.1. Solutions for Coded Errors.......................................................................................................15
2.2. Solutions for Errors not being Displayed..................................................................................17
3.ASSEMBLYING/DISASSEMBLYING PROCEDURES OF PARTS.......................21
3.1. Front Panel ..............................................................................................................................21
3.2. Side Panels..............................................................................................................................21
3.3. Contactor. ................................................................................................................................21
3.4. Circuit Breaker .........................................................................................................................22
3.5. Neutral Busbar.........................................................................................................................22
3.6. Supply-Return Manifold............................................................................................................22
3.7. Pump........................................................................................................................................22
3.8. Air Purger.................................................................................................................................22
3.9. Limit Thermostat ......................................................................................................................22
3.10. Mainboard..............................................................................................................................23
3.11. Relay Boards..........................................................................................................................26
3.12. Expansion Tank .....................................................................................................................26
3.13. Inlet Duct................................................................................................................................26
3.14. Return Duct............................................................................................................................26
3.15. 3 Bar Safety Valve .................................................................................................................26
3.16. Drainage Tap .........................................................................................................................26
3.17. Motorised Valve .....................................................................................................................26
3.18. Submersion Type NTC...........................................................................................................27
3.19. Plate Exchanger.....................................................................................................................27
3.20. Main Exchanger Tank ............................................................................................................27
3.21. Switch Cover..........................................................................................................................27
3.22. Pressure Sensor ....................................................................................................................27
3.23. Resistor Replacement............................................................................................................28
3.24. Controller and Sensor Connections .......................................................................................28
1.6.Power Supply Connection Requirements ................................................................................14

4.PART DEFINITIONS AND ERROR TYPES ....................................................... 30
4.1. Heating Resistor.......................................................................................................................30
4.2. Main Exchanger Tank ..............................................................................................................32
4.3. Circuit Breaker .........................................................................................................................33
4.4. Neutral Busbar.........................................................................................................................34
4.5. Mainboard................................................................................................................................34
4.6. Relay Board .............................................................................................................................35
4.7. Pump........................................................................................................................................37
4.8. Neutral and Ground Terminals.................................................................................................38
4.9. Motorised Valve .......................................................................................................................38
4.10. Plate Exchanger.....................................................................................................................40
4.11. Contactor................................................................................................................................41
4.12. Expansion Tank .....................................................................................................................43
4.13. Limit Thermostat ....................................................................................................................44
4.14. Surface Type NTC .................................................................................................................45
4.15. Submersion Type NTC...........................................................................................................46
4.16. Flow Sensor...........................................................................................................................47
4.17. Air Purger...............................................................................................................................48
4.18. Water Pressure Sensor..........................................................................................................49
4.19. Flow Turbine ..........................................................................................................................50
4.20. 3 Bar Safety Valve .................................................................................................................51

GENERAL WARNINGS
- Circuit Breaker poles, contactor main and auxiliary contacts and coil terminals,
motorised valve connector terminals, resistance and relay contact terminals, pump
connector terminals, overheat thermostat and motherboard should never be contacted
with bare hands during interventions to the device.
- If water leaks are observed in the cabinet during the intervention to the device, the
energy supply should be cut off immediately and supplied in a controlled manner after
the wet areas are dried.
- Sharp points of the device such as bending points of panels should not be touched
with bare hands.
- When intervening, points of the device that may be extremely hot, such as the inlet
duct, main exchanger tank body, plate exchanger, should be treated in a controlled
manner and interventions that may cause injuries due to sudden reflexive movements
should be avoided.
- In the operations performed for re-installation or transportation of the device, the items
of "E.C.A. Electric Combi Boiler Installation and Commissioning Checklist" should be
taken as a basis and checked one by one.
4

1.2. Button Functions
Key Number Key Name Function
K1 Mode
- The short press switches between STANDBY MODE, SUMMER MODE and WINTER MODE.
- Resets error
-Allows skipping test mode
- Allows skipping AP function
- Directs to the service menu when pressed for 5 seconds
- Provides access to the selected sub-menu in the service menu
- Saves the changes and exits when pressed for 5 seconds in the parameters menu
- Exits the error history menu when pressed for 5 seconds
K3 CH Minus
- Decreases central heating set temperature
- Decreases the password value when entering the parameters menu
- Decreases the parameter value
- Displays information value
- Displays error history value
K4 CH Plus
- Increases central heating set temperature
- Increases the password value when entering the parameters menu
- Increases the parameter value
- Displays information value
- Displays error history value
K5 DHW Minus
- Decreases the domestic water set temperature
- Allows selection between parameter, information, error history and cleaning error history menus
- Confirms password when entering the parameters menu
- Decreases the parameter number
- Displays information number
- Decreases the error history number
K6 DHW Plus
- Increases the domestic water set temperature
- Allows selection between parameter, information error history and cleaning error history menus
- Confirms password when entering the parameter menu
- Increases the parameter number
- Displays information number
- Increases the error history number
K5&K6 DHW- & DHW+ Pressing and holding for 5 seconds switches between Eco and Comfort modes
K3&K5 CH- & DHW- Provides access into full capacity test mode when pressed for 5 seconds.
1. Device Control, Button Functions and Service Menus
1.1. Control Panel
The control panel that provides control of the device consists of 5 different buttons. The
layout of the buttons is as follows:
K5 K1
K6
K4
K3
K3&K4 CH- & CH+ Single Resistor Test Mode
5

1.3. Introduction to Parameter, Information and Error History Menus
The service menu is accessed if K1 key is pressed for 5 seconds. The sub-menu desired to be
entered is opened with K1 key by switching between the symbols displayed on the screen with the
K5 and K6 keys.
Displayed Symbol Menu Description
tS Parameters Menu
In Information Menu
Hi Error History Menu
1.3.1. Parameters Menu
When "tS" symbol appears on the screen after pressing K1 for 5 seconds, press K1 once again and
"00" is displayed on the screen. The displayed message is the password screen required to access
the service menu. When this screen appears, change the password by using K3 and K4 and confirm
the password with K5 or K6.
For restricted menu access, the required password should be entered as 03 and K5 or K6 should be
pressed. With this password, only P00, P03, P05, P23, P24, P30, P33 parameters can be accessed.
In order to access the F22 parameter, which must be changed for the boiler capacity selection, the
password should be 15. With this password, only the capacity selection parameter can be accessed.
Parameter numbers are displayed on the screen after the password is entered. You can navigate
through the parameter numbers with the K5 and K6 buttons, and increase or decrease the parameter
number you want to change or read by entering it with K3 or K4.
While in the parameters menu, press K1 once to return to the menu selection screen. You can return
to the main screen by pressing and holding K1 for 5 seconds. If no button is pressed for 60 seconds,
the normal operation screen will be returned.
1.3.1.1. Table of Parameters
Parameter Parameter Name
Definitions of Parameter Values Setting Range Factory Setting P00
2345
P00 Domestic water configuration *
1 =Instantaneous heater
2 =Instantaneous heater+Solar energy
3 = Storage tank
4 = Solar energy storage tank
5 =Central heating only
1-5 1 2345
P03 Type of heating system
0=Radiator heating
1=Ground heating
When parameter P03 is set to 1, P02 is limited to 45°C.
When parameter P03 is set to 1, P02 is limited to 80°C.
0-1 0 0000
P05 Type of domestic water request
0: Pakkens Brass Flow Sensor +CEME-GTE Sensor
1:-
2: Emas Flow Sensor + Bitron Pressure Switch
3: Pakkens C Flow Sensor +CEME-GTE Sensor
4:-
0-4 0 0000
P23 AFCT waiting time for central heating request (min.) 0-10 33333
6

P24 Pump overrun time after central heating request (sec) 0-99 60 60 60 60 60
P30 K factor for outdoor temperature sensor compensation 0-30 00000
P33 Domestic water shut off temperature configuration
0: Stop at 71°C
1: Domestic water set value + FP04
0-1 1 111-
F22 Boiler Capacity
6 = 6KW
9=9KW
12 = 12KW
15 = 15KW
18 = 18KW
24 = 24KW
27 = 27KW
6,9,12,15,
18,24,27 24 24 24 24 24
1.3.2. Information Menu
After pressing and holding K1 for 5 seconds, proceed with K5 and K6 to display "In" symbol on the
screen. When you see this symbol, you can enter the information menu by pressing K1 again. After
entering the menu, you can navigate between the information numbers with K5 and K6 and display
the value in the information number you want by pressing K3 or K4 once. While displaying the value
in the information menu, you can change to the information number by pressing K1 once. Pressing
K1 once while on the information number selection screen provides access to the service menu
selection screen. If no button is pressed for 60 seconds, the normal operation screen will be
returned.
The information menu is where you can access some of the instant measurement and operating
information of the device. The values you can access from the information menu are included in the
following table:
7

Information Number Description
i00 Instant central heating inlet temperature (°C)
i01 Instant central heating return temperature (°C)
i02 Instant domestic water temperature
(Instantaneous/Tank/Above tank) (°C)
i03 Instant domestic water temperature (Below tank) (°C)
i04 Solar panel temperature (°C)
i05 Instant flow (L/minute x 10)
i06 Instant outdoor air temperature (°C)
i07 Calculated central heating set temperature (°C)
i08 Number of active relays
i09 Software version
1.3.3. Error History Menu
After pressing and holding K1 for 5 seconds, proceed with K5 and K6 to display "Hi" symbol on the
screen. When you see this symbol, you can enter the error history menu by pressing K1 again. After
entering the menu, you can display the last 8 codes by switching between the last error codes with
K3 and K4. Pressing K1 once while the error codes are displayed on the screen directs to the
service menu selection screen. You can return to the main screen by pressing and holding K1 for 5
seconds. If no button is pressed for 60 seconds, the normal operation screen will be returned.
1.3.4. Annual Maintenance Counter Reset
While the "tS" symbol is displayed on the screen, the password selection menu is accessed by
pressing K1. Here, the value of "11" is reached by using K3 and K4 and the value is selected with K1
or K3. The value "P34" will blink on the screen. K4 allows you to enter and "rE" symbol is displayed
on the screen. The annual maintenance counter is reset by pressing K1 while the "rE" symbol is
displayed on the screen.
1.3.6- Full Capacity Test Mode
Тоа е режимот што му овозможува на уредот да работи со полн капацитет и да контролира
дали се активирани сите отпори. Може да се работи најмногу 3 пати откако уредот ќе се
вклучи. Буквите „Ft“ се појавуваат за време на овој режим на тестирање.
1.3.5- Single Resistor Test Mode
Test mode is activated by pressing K3 and K4 buttons together for 5 seconds. Test mode
simulates a CH heat demand and it activates a single resistor.
Test mode is terminated if K1 button is pressed or Test mode timeout period exceeds.
K4 button -> Changes active relay (Resistor 1 through resistance 9)
K3 button -> Changes active relay (Resistor 9 through resistance 1)
Timeout period is 15 minutes for test mode.
8

1.4. Cable Diagrams by Capacities
1.4.1. 6-9 kW Connection Diagram
22 14 A2
21 13 A1
6/T3 4/T2 2/T1
5/L3 3/L2
1/L1
-Q
Pump
3-Way Valve
overheat Thermostat
CH Inlet NTC
CH Return NTC
Boiler Tank NTC
DHW Solar STB
Water Pressure Sensor
DHW Supply Sensor
Modbus Haberleşmesi
Cascade Card
Neutral Terminal
Circuit Breaker
Contactor
Electrical Heaters
Relay Boards
Neutral Busbar
Outside Air NTC
Programmable timer Modulated Room Thermostat Wi-Fi Board Connection
Pump GND Pump PWM Pump Encoder
9

1.4.2.12-15 kW Connection Diagram
Neutral Terminal
Circuit Breaker
Contactor
Neutral Busbar
Electrical Heaters
Limit Thermostat
Relay Boards
CH Inlet NTC
CH Return NTC
DHW/Boiler Tank NTC
3-Way Valve
DHW Solar STB
Water Pressure Sensor
DHW Supply Sensor
Modbus Communication
Pump
Outside Air NTC
Programmable timer
Cascade Card
Pump GND
Pump PWM
Pump Encoder
Modulated Room Thermostat
Wi-Fi Board Connection
10

1.4.3.18-24 kW Connection Diagram
Neutral Terminal
Circuit Breaker
Contactor
Neutral Busbar
Limit Thermostat
CH Inlet NTC
CH Return NTC
DHW/Boiler Tank NTC
3-Way Valve
DHW Solar STB
Water Pressure Sensor
DHW Supply Sensor
Modbus Communication
Pump
Outside Air NTC
Programmable timer
Wi-Fi Board Connection
Pump GND
Pump PWM
Pump Encoder
Modulated Room Thermostat
Cascade Card
Electrical Heaters
Relay Boards
11

1.4.3. 27 kW Connection Diagram
Neutral Terminal
Circuit Breaker
Contactor
Contactor
Neutral Busbar
Electrical Heaters
Electrical Heaters
Limit Thermostat
Relay Boards
CH Inlet NTC
CH Return NTC
DHW/Boiler Tank NTC
3-Way Valve
DHW Solar STB
Water Pressure Sensor
DHW Supply Sensor
Modbus Communication
Pump
Outside Air NTC
Programmable timer
Modulated Room Thermostat
Wi-Fi Board Connection
Cascade Card
Pump GND
Pump PWM
Pump Encoder
12

1.5. Detailed View and List of Components
1 19
2
4 11
15
16
14
18
17
1. Air Purge
2. Circuit Breaker
3. Ground Terminal Block
4. Neutral Terminal Block
5. Neutral Busbar
6. Cantactor
7. 3 Way Valve
8. 3 Bar Safety Valve
9. Electric Heaters
10. Main Heat Exchanger
11. Expansion Vessel
12. Drain Valve
13. Plate Heat Exchanger
14. Circulation Pump
15. Relay Boards
16. Pressure Sensor
17. Immersion type NTC
18. Flow sensor
19. Overheat thermostat
13

1.6.Power Supply Connection Requirements
ARCEUS 9
CH-ST
Single-phase 3x10 39 B40-1P
Three-phase 5x2.5 13 B15-3P
ARCEUS 12
MT-CH-ST
Single-phase 3x10 52 B63-1P
Three-phase 5x4 17 B20-3P
ARCEUS 18
MT-CH-ST Three-phase 5x6 26 B32-3P
ARCEUS 24
MT-CH-ST Three-phase 5x6 35 B40-3P
ARCEUS 27
MT-CH-ST Three-phase 5x10 39 B40-3P
Device Power Supply Supply Cord
(mm2)
Nominal
Current (A)
Supply Line Minimum
Circuit Breaker Capacity
ARCEUS 6
CH-ST
Single-phase 3x6 26 B32-1P
Three-phase 5x2.5 9 B10-3P
Table 2. Power Supply Connection Requirements
14
ARCEUS 15
MT-CH-ST
Single-phase 3x1665 B80-1P
Three-phase 5x621 B25-3P

2. Error Codes and Solutions
2.1. Solutions for Coded Errors
ERROR
CODE
ERROR
TYPE
DESCRIPTION
TYPE
SOLUTION
E03
Limit Thermostat
Protection Error
This error is received, if one of
the central heating inlet or return
temperature sensors reads over
107°C. The error should be reset
when the temperature drops to
85°C.
LOCKOUT
1- Reset the error.
2- Measure between the terminals of the overheat
thermostat. If it is not short-circuit, wait for the tank to
cool. If there is no short-circuit between the terminals
despite the cooling of the tank, replace the overheat
thermostat and reset the error.
3- If the overheat thermostat terminals are measured
open-circuit, check the pump connections. If the pump
cables are connected, make sure that the pump
circulates the water while it is energised. If the pump is
pressurising the water normally, there may be a
blockage in the heating circuit or the valves may be
closed.
4- Make sure the motorised valve works normally and
moves the pin to switch between domestic water and
central heating.
5- If this error is received, although there is a short-
circuit between the terminals of the overheat
thermostat, measure the AC voltage between the
terminals A1 and A2 of the contactor. If it is close to 230
VAC, check the presence of energy at NO contact
terminals no. 13 and 14 with the voltage tester.
6- If one of the terminals no. 13 and 14 is energised
and the other is not, replace the contactor, if neither is
energised, check the end-to-end integrity of the
feedback cables.. If the cables are broken or damaged,
replace the high voltage cable group.
7- If the parts are found to be solid after all the checks,
the mainboard must be replaced.
E04
Faulty contactor
feedback
If a false feedback is received
even though the contactor
should not be active, this error
is displayed. A RESET
operation is required after the
error is corrected.
LOCKOUT
1- Reset the error.
2- If you still receive the error after reset, make sure
that the contactor feedback cables are connected to
terminals no. 13 and 14.
3- If the error persists even though the feedback
cables are connected to the correct terminals, measure
the resistance between terminals no. 13 and 14 when
the contactor is not energised. If a value other than
open-circuit is displayed, replace the contactor.
4- If the contactor is steady, check the end-to-end
integrity of the feedback cables.
5- If the cables are also solid, the mainboard must be
replaced.
E13
Too Frequent
Error Reset
Error
This error is received when 5
errors are reset within 1 hour.
Domestic water and central
heating requests are stopped.
This error can be deleted by
simply cutting off the power
supply to the motherboard.
LOCKOUT
The error is corrected by turning off and on the Circuit
Breaker inside the device or a cutting element in the
front of the supply line.
F33
Central Heating
Return
Temperature
Sensor Error
This error is received if the
central heating return
temperature sensor is short-
circuit, open-circuit, or
damaged. Domestic water and
central heating request is
stopped. When this error is
deleted, normal operation
begins.
ERROR
1- Make sure the NTC cables in the return water line
are plugged in.
2- If the cables are plugged in, check the cables
end-to-end. Make sure the cables are undamaged
and plugged into the mainboard terminal. If there is a
damaged wire, replace the low voltage cable group.
3- If the cables are not damaged, measure the
resistance between the terminals of the NTC and
check that their values are appropriate.
4- If the resistance value between the NTC terminals
is according to the table, replace the return and
supply water NTCs. If the error code does not change,
replace the mainboard. If the error code becomes
F35, replace the return water NTC.
F34
Low Voltage
Error
This error is received if the
supply line voltage is below 170
±15 VAC. This error is corrected
if the line voltage is above 180 ±
15 VAC.
ERROR
1- Measure the AC voltage between the phase and
neutral terminals of the mainboard. If the voltage
value is above 195 VAC, check the voltage of the line
and wait for it to increase.
2- If the voltage value is above 195 VAC,
15

F35
Central Heating
Inlet
Temperature
Sensor Error
This error is received if the
central heating inlet
temperature sensor is short-
circuit, open-circuit, or
damaged. Domestic water and
central heating request is
stopped. When this error is
deleted, normal operation
begins.
ERROR
1- Make sure that the cables of the NTC in the supply
line are connected.
2- If the cables are plugged in, check the cables end-
to-end. Make sure the cables are undamaged and
plugged into the mainboard terminal. If there is a
damaged wire, replace the low voltage cable group.
3- If the cables are not damaged, measure the
resistance between the terminals of the NTC and
check that their values are appropriate.
4- If the resistance value between the NTC terminals
is according to the table, replace the return and supply
water NTCs. If the error code does not change,
replace the mainboard. If the error code becomes F35,
replace the return water NTC.
F37
Low Water
Pressure
FP11 water pressure parameter
is at a low level. This error is
received if the water pressure is
less than FP11/10 bar.
The error is automatically
deleted when the water
pressure is more than
(FP11/10+0.4 bar).
ERROR
1- Fill the pipeline with water by opening the filling
tap.
2- If the pressure does not increase above 0.8 bar
and the error does not disappear after the filling tap is
opened, make sure that the valve is functioning
mechanically. If the tap is faulty, replace it.
3- If the filling tap is also intact, make sure that the
water pressure in the plumbing is sufficient.
4- If the plumbing pressure is also suitable, make
sure that the cabling of the pressure sensor is
undamaged and plugged in. If the cabling is suitable,
replace the pressure sensor.
5- If the problem is not solved by replacing the
sensor, replace the mainboard.
F39
Outdoor
Temperature
Sensor Error
This error is received if the
outdoor temperature sensor is
short-circuit, open-circuit, or
damaged. Domestic water and
central heating request is
stopped. When this error is
deleted, normal operation
begins.
ERROR
1- Reset the error.
2- If the error does not disappear after reset, make
sure that the outdoor sensor cables are connected.
3- If the cables are undamaged and connected
properly, replace the outdoor sensor.
4- If the error persists after replacing the sensor,
replace the mainboard.
F40
High Water
Pressure
FP12 water pressure parameter
is at a high level. This error is
received if the water pressure is
more than 3.3± 0.3 bar.
The error is automatically
deleted when the water
pressure is less than 3.3±0.3
bar.
ERROR
1- Check if the error disappears by draining the water
from the heating installation.
2- If the pressure does not drop below 3.3 ± 0.3 bar
after draining the water and the error does not
disappear, check the cabling of the pressure sensor.
4- If the cabling of the pressure sensor, replace the
pressure .
5- If the problem persists after replacing the pressure
sensor, replace the mainboard.
F47
Water Pressure
Sensor Error
This error is received if the
pressure sensor is short-circuit,
open-circuit, or damaged.
When this error is deleted,
normal operation begins.
ERROR
1- Check the cabling of the pressure sensor. If all
cables are connected and undamaged, replace the
pressure sensor.
2- If the error persists after replacing the pressure
sensor, replace the mainboard.
F50
Solar Energy
Boiler Tank
Temperature
Sensor Error
This error is received if the solar
energy boiler tank temperature
sensor is short-circuit, open-
circuit, or damaged. Domestic
water and central heating
request is stopped. When this
error is deleted, normal
operation begins.
ERROR
1- Reset the error.
2- If the error persists after reset and you are not
using boiler or solar energy tank, make sure P00
parameter is not 2, 3 or 4. If you are using boiler or
solar energy tank, make sure the cabling of the
temperature sensor is undamaged and assembled.
3- If the cables are undamaged and connected
properly, replace the sensor.
4- If the error persists after replacing the sensor,
replace the mainboard.
F51
Solar Panel
Temperature
Sensor (PT1000)
Error
This error is received if the
solar panel temperature sensor
(PT1000) is short-circuit, open-
circuit, or damaged. Domestic
water and central heating
request is stopped. When this
error is deleted, normal
operation begins.
ERROR
1- Reset the error.
2- If the error persists after reset and you are not
using solar energy panel, make sure P00 parameter is
not 2, 3 or 4. If you are using solar energy panel, make
sure the cabling of the temperature sensor is
undamaged and assembled.
3- If the cables are undamaged and connected
properly, replace the sensor.
16

2.2. Solutions for Functional Faults of Device
2.2.1. In case the heater circuit of the device underheats or does not heat at all:
1- Put the device into test mode by pressing and holding K3 and K5 together for 5 seconds. When
the device is put into test mode, "FT" will be displayed on the screen. In this case, measure the
current through the resistor neutral cables using a clamp meter and detect whether there is a dead
resistor.
2-If there is no dead resistor in test mode, there is no need to control power circuit elements such as
the mainboard, relay boards, resistors and contactors. In this case, the control sensors and hydraulic
equipment must be checked.
a- First, check the piping connections and make sure that the central heating valves outside the
boiler are turned on. If the valves are turned on, remove the motorised valve from the device and
make sure its pin is pressed. While the pin of the motorised valve is pressed, it sends water to the
heater circuit. b- If the motorised valve is in its normal position, check that the heater installation is
not blocked. c- If there is no blockage in the plumbing, check the temperatures of "i00 central heating
supply water" and "i01 central heating return water" from the information menu and observe if there
is an incorrect measurement. If there is an incorrect measurement, relocate the NTCs and check if
the supply or return water temperature measurement has improved. If it does, replace the NTC that
has problem in measurement. If not, remove the NTC and measure the resistance and check
whether the measurement is according to the table. If the measurement is correct, a mainboard
replacement may be required.
3- If there is a dead resistor or a dead cable in test mode, follow the steps below:
a- Check whether there is voltage at the output contacts no. 2, 4 and 6 of the contactor with the
voltage tester by opening the switch cover. Replace the contactor if there is no voltage in any of the
three contacts although the input poles of the contactor are energised and the measured voltage
difference between the terminals A1-A2 of the contactor is 180-240 VAC.
b- Disconnect the input power supply of the device and check whether there is deformation or loose
contact in the phase and neutral cables of the dead resistor.
c- If there is no deformation in the cables, measure between the phase terminals of the resistors and
the neutral busbar after disconnecting the input power supply of the device and make sure that all
the resistors are in the correct resistance range. The required resistance value range is as follows:
Part Code Part Code
7006250005 7006250004
Maximum
overheat
Minimum
overheat
Maximum
overheat
Minimum
overheat
19 16 28 24
17

d- If there is no loose contact in the cables and the resistance of the resistors are within normal
values, take measurements from other resistors in the same group. If all the resistors in a single
resistor group are dead, check that the relay trigger cables are undamaged and connected to both
the mainboard and relay board sides. On the mainboard, these cables should be connected to the
following ports:
- For 6 and 9 kW devices: "Relay Group 1"
- For 12 and 15 kW devices: "Relay Group 1" and "Relay Group 2",
- For 18, 24 and 27 kW devices: "Relay Group 1", "Relay Group 2" and "Relay Group 3".
e- If the connections are correct, disconnect the input electricity supply of the device from the Circuit
Breaker, disconnect the dead resistor cables from the relay boards and unplug them, and turn on the
Circuit Breaker again and put the device into test mode with K3 and K5. While the device is in test
mode, measure the resistance between the pins you disconnected. If you're reading a resistance
close to 0 between the relay pins, the relay board and mainboard are steady.
f- If you see the open-circuit ("OL") value between the relay pins, look at the LEDs on the relay
board and check if the lamps are lit.
g- If the lamps are on and "OL" (open-circuit) is still displayed on the screen, replace the relay
board.
h- If the trigger cable is properly connected but the LED lamp does not light, plug the trigger cable
into the port of another relay board and recheck the LED lamps.
- If the lamps of new relay board light, the problem will be solved by replacing the relay board.
- If the LEDs of the new relay board do not light, replace the mainboard.
- Put the device in test mode after the part replacements, and check if the resistors are activated.
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2.2.2. In case the device underheats or does not heat domestic water at all:
1- Put the device into test mode by pressing and holding K3 and K5 together for 6 seconds. When
the device is put into test mode, "FT" will be displayed on the screen. In this case, measure the
current through the resistor neutral cables using a clamp meter and detect whether there is a dead
resistor.
2- If there is no dead resistor in test mode, there is no need to control power circuit elements such
as the mainboard, relay boards, resistors andcontactors. In this case, the control sensors and hydraulic
equipment must be checked.
A- First, remove the motorised valve on the device and check whether the pin goes in when the flow
passes through the device. If the pin is going in, check the spring suppressed by the motorised valve
in the supply manifold. If the spring is faulty and cannot be repaired, replace the supply manifold,
b- If the pin is not going in:
- If the flow rate appears to be at its normal value, follow the steps described in the title 4.9 "Voltage
and Position Control in Domestic Water Heating". If voltage values are normal, replace motorised
valve.
- If the voltage value is not as it should be in the domestic water position, read the "i05 Domestic
water flow rate (L/min.)" information from the information menu. If the flow rate is displayed as "0"
even though water is passing through the domestic water circuit, make sure that the flow sensor is
installed correctly. If a value of "0" or less is displayed even though the flow sensor is installed,
replace the flow sensor.
c- If the pin of the motorised valve completes the action normally, make sure that the submersion
type NTC on the hydroblock is installed correctly. If the NTC is installed properly, check the "i02
domestic water instantaneous temperature" value in the information menu. If the value is incorrect,
replace the NTC.
3- If there is a dead resistor or a dead cable in the test mode, follow the steps below (you can see
the images related to the measurements in this section in the 3rd item of the title 2.2.1).
a- Check whether there is voltage at the output contacts no. 2, 4 and 6 of the contactor with the
voltage tester. Replace the contactor if there is no voltage in any of the three contacts although the
input poles of the contactor are energised and the measured voltage difference between the
terminals A1-A2 of the contactor is 180-240 VAC.
b- Disconnect the input power supply of the device and check whether there is deformation or loose
contact in the phase and neutral cables of the dead resistor.
c- If there is no deformation in the cables, measure between the phase terminals of the resistors and
the neutral busbar after disconnecting the input power supply of the device and make sure that all the
resistors are in the correct resistance range. The required resistance value range is as follows:
Part Code Part Code
7006250005 7006250004
Maximum
Limit Minimum
Limit Maximum Limit Minimum
Limit
19 16 28 24
d- If there is no loose contact in the cables and the resistance of the resistors are within normal
values, take measurements from other resistors in the same group. If all the resistors in a single
resistor group are dead, check that the relay trigger cables are undamaged and connected to both
the mainboard and relay board sides. On the mainboard, these cables should be connected to the
following ports:
- For 6 and 9 kW devices: "Relay Group 1"
- For 12 and 15 kW devices: "Relay Group 1" and "Relay Group 2",
-For 18, 24 and 27 kW devices: "Relay Group 1", "Relay Group 2" and "Relay Group 3".
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e- If the connections are correct, disconnect the power of the device from the Circuit Breaker,
disconnect the dead resistor cables from the relay boards and unplug them, and turn on the Circuit
Breaker again and put the device into test mode with K3 and K5. While the device is in test mode,
measure the resistance between the pins you disconnected.
f- If you see the open-circuit ("OL") value between the relay pins, look at the LEDs on the relay board
and check if the lamps are lit.
g- If the lamps are on and "OL" (open-circuit) is still displayed on the screen, replace the relay board.
H- If the trigger cable is properly connected but the LED lamp does not light, plug the trigger cable
into the port of another relay board and recheck the LED lamps.
- If the lamps of new relay board light, the problem will be solved by replacing the relay board.
- If the LEDs of the new relay board do not light, replace the mainboard.
- Put the device in test mode after the part replacements, and check if the resistors are activated.
2.2.3. What to Do in if Comfort Mode Does not Work
When the device is in comfort mode, the water in the exchanger tank is kept at the domestic water
set temperature. When the device is in comfort mode, the water in the tank is heated at minimum
with a single resistor inside the device. Check the relays after you see the tap icon blinking on the
screen of the device in comfort mode. The LED of one of the relays should light up. Measure the
current with a clamp meter through the cables from the contacts of the relay whose LED is lit. If they
are not dead, the comfort mode of the device is operating. If the resistor that needs to heat is dead in
this case, measure this resistor in accordance with the 3rd item of the title 2.2.1.
2.2.4. What to Do if the Device's Circuit Breaker Blows
1- Disconnect the input power supply of the device and observe if there is any physical deformation
in any cable. If there is a deformed cable, replace it.
2- Check if there is a physical deformation such as burning by checking the Circuit Breaker. If the
Circuit Breaker is deformed, replace it.
3- Open the control panel and check if the glass Circuit Breaker of mainboard is intact. If the glass
Circuit Breaker of mainboard is blown and its terminals are open-circuit:
a- Disconnect all the external connections of the connector with the power cable by replacing the
glass Circuit Breaker of the device, and re-energise the device. b- In this case:
- If the glass Circuit Breaker is not lit, measure the resistance between the phase and neutral
terminals of the pump, motorised valve, terminals A1 and A2 of the contactor coil, A1 and A2
terminals of the relays on the board to detect the short-circuited part and replace it. After replacing
and reconnecting the parts, operate the device in DHW and CH heating modes.
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