THERMEx EUROSTAR Troubleshooting guide

EUROSTAR
Electric wall hung boiler
Instructions for use installation and maintenance

Dear user:
You have become the owner of the direct heated Thermex electric boiler, which is
intended for heating system and easy to comfortably control .
We hope this Thermex boiler can provide you with reliable service. Some basic
principles must be adhered to during installation and maintenance. Therefore, we
ask you to be familiar with the user manual and follow this manual when working
with Thermex electric boiler.
We believe that the Thermex electric boiler will help you build a comfortable
environment and an optimal thermal comfort level.
Please note the following important instructions and warnings:
1.The installation and maintenance of boilers and other subsequent equipment must
conform to the design, comply with all applicable laws and regulations, and comply
with the technical standards and regulations of the manufacturer.
2.The boiler must be installed in its intended environment, and any safety device or
operating device must be put into work.
3.Boiler can only be adjusted by manufacturer or authorized professional.
4.For boiler adjusting and in case of any failure, please turn to the professional staff
authorized by the manufacturer - any non-professional intervention may cause the
boiler to be damaged (and the successor equipment that will eventually damage )!
5.Check the integrity of the product.
6.Check that the model of delivery is the same as the model you require.
7.If you are not fully aware of how to operate boilers, you should read and study all
relevant information in the manual and always follow them strictly.
8.Do not remove or damage any signs and nameplates on the boiler.
9.The boiler meets the following standards: EN60335-1:2012, EN62233:2008,
EN55014-1:2006+A1:2009+A2:2001, EN61000-3-12:2005, EN61000-3-11:2001,
EN55014-2:1997+A1:2001+A2:2008
10.After the expiration date of the boiler and its parts, they should be disposed of in
an environmentally friendly manner.

Thermex electric boiler
1.Instructions......................................................................................1
1.1Introduction................................................................................1
1.2Equipment and personal safety.................................................1
1.3The control panel......................................................................2
1.4Key operation.............................................................................3
1.5Fault and recovery.....................................................................4
1.6Function..................................................................................5
1.7System of water injection...........................................................5
2.Installation.......................................................................................6
2.1Running conditions and installation location..............................6
2.2Boiler installation .......................................................................7
2.3Pipe connection..........................................................................8
2.4Electrical installation...................................................................9
3.Service and maintenance..............................................................10
3.1Adjustment ..............................................................................10
3.2Maintenance...............................................................................1
3.3Failure recovery........................................................................12
4.Technical features and parameters...............................................13
4.1Dimensions and joints..............................................................13
4.2Structure drawing and main parts............................................14
4.3The water system.....................................................................15
4.4Circulating pump diagram........................................................16
4.5Technical data..........................................................................17
4.6Wiring diagram.........................................................................18
4.7Power cord connection mode..................................................19

1
1.Instructions
1.1introduction
According to the development trend of the electric heating boiler, the company has
put the heating boiler with direct heating characteristics into the market, and it has
several series of 6, 8,9,12,15,18,21 and 24kW.
This is a kind of high efficiency of the boiler, it equipped with heating system is
equipped with independent each other, through a simple control panel can be
quickly and easily make the operation of the boiler adapted to the conditions of the
given object.
1.2 equipment and personal safety
Through the application of lS09001 quality management system, the same
characteristics are guaranteed and checked in the manufacturing process.
As the electric heat boiler of the product, check its safety according to
STN060830, STN 92 0300 and STN en60835-1.
In the course of boiler operation and transportation, according to its original
purpose and actual use conditions, it must also comply with the requirements set
out in the following guidance documents.
--In the field of design: STN060310;
--In installation and assembly: first, the electrical regulations on public equipment
for preventing electrical accidents (i.e. local technical standards with identification
number 332000), followed by STN332130 and STN332180 and guidelines
number: 48/1982 (Revised), and binding regulations on health protection at work;
--During operation and maintenance: STN 077401 (possibly STN 757111 or
STN830616) and STN33 1310.
In addition to the document requirements that have been pointed out, the use of
boilers must follow the manual and operation of boiler attached documents from
the manufacturer. When used, we should prevent people from children, people
affected by drugs, irresponsible and mentally ill people and so on.
The manufacturer shall make the products conform to the technical rules and
specifications, and shall be approved by the lS09001 quality management system.
By pressing the regulations UBP SR No. 74/1966 Coll (revised) get the license
contract the company network, to ensure the sustained attention to product level
(i.e. in the installation, commissioning, use familiar, regulation and control in the
process, about the local conditions, during the warranty period and after warranty
period).

No.
Description
1
Temperature, failure and menu display. Setting the target temperature of the heating, the
temperature value of the heating is blinking, and set the target temperature of the hot
water, the temperature value of the hot water is blinking. In the case of no-fault
non-setting, the summer mode or winter bathroom mode shows the current temperature of
the bath water, and the winter mode shows the current temperature of the heating water
2
Heating icon. In winter mode, if the heating mode is running, the heating icon disply and
flashes when the heating target temperature is setting.
3
Time slot.Divide 24 hours a day into 24 hours (one hour per hour) and light up at the same
time as the timing heating function sign.
4
Hot water icon. Under normal state, if the water tank is heating, the hot water icon display,
when setting the target temperature of the water tank the icon flashing.
5
Winter mode icon. In winter mode display.
6
Summer mode icon. In summer mode display.
7
Indoor temperature icon. When the temperature of the heating room is shown, the icon is
displaying.
8
Week. Show the Monday to Sunday.
9
Clock. Display current time.
10
Timing heating icon. In winter mode, the timing heating function is running the icon display.
11
Indoor and outdoor temperature values. When you want to show indoor and outdoor
temperature, the indoor and outdoor temperature is displayed every 30 seconds and lasts
5 seconds.
12
Adjust mode icon. When entering adjust mode, the icon lights up
13
Anti-freeze mode icon. Light up when anti-freeze mode is turned on.
14
Fault icon. Light up when a fault occurs.
15
Outdoor temperature icon. When the outdoor temperature is displayed, the icon is lit.
16
Power display. When heating, display the current heating power. Turn on a heating tube
and light up a point.
17
Flame icon. When the electric heater is turned on, light up
18
Fan icon. When the fan is running, it will light up.
19
Pump icon. When the pump is running, it will light up.
2
1.3The control panel
Display
1.Liquid crystal display
Eight touch button and one LCD
figure 1
1
45
10
11
19 18 17 16 15 14 13
2
6
3
8 9
7
12

1.4.6 open timing heating"
Turn on state, press “ “can choice open timing heating or not (“ ” icon display
means open timing heating, “ ” icon not display means not open timing heating).
Press” “key for 3S, “come into timing heating setting state, by press “+”and “-” switch
between 24 segments, choice the segment that need heating and press “ “,segment lit
meaning running, not lit meaning no running. Finished the setting, press “Reset” save and
exit.
1.4.4 timing heating setting:
1.4.5 time setting:
3
2. The backlight
Turn off boiler ,if no button operation the backlight delay 10S shut down.
Turn on boiler, backlight is lit . If there is no button operation for 10 minutes, the
backlight will be automatically extinguished. Press any key to restore light.
1.4 key operation
1.4.1 Turn ON/OFF
Press” ” 5S , the boiler will switch between ON or OFF; Off state display “
OF”;when off state only anti-freezing and pump anti-block function can running.
1.4.2 Temperature setting
On heating mode, press “+” and”-”change the setting temperature, press” ”save and
switch to hot water temperature setting, press “+" and "-" change the setting temperature,
press “Reset” exit and finish the setting; on hot water mode, press “+" and "-" change the
setting temperature, press “Reset” save and exit.
1.4.3 Winter/Summer mode
turn on state, press” ”can make the boiler switch between winter mode(heating and
hot water function) and summer mode(only hot water function)
On/Off state, press “ ” 3S come into time setting state, the hour item blinking,
press”+”and “-” change the hour value; after setting hour, press “ “ the min item
blinking, press”+”and “-” change the min value; after setting min, press “ “ the week
item blinking, press”+”and “-” change the week value; finished setting, press “Reset”
save and exit setting state.
1.4.7parameter setting
No fault state, press “Reset” key 10S, come into parameter menu, by press”+” and “-”
can switch between parameter “tS” and “rE” and “Hi”, at this level menu, press”Reset”
10S, can come into and setting all the parameter.
1.4.7.1Hi parameter
The "Hi" function is to record the last 10 failures of the boiler. when screen display “Hi”,
press” “key, then press “+” and “-” can switch between H01 to H10,H01 is the recent
fault, H10 is the farthest fault, choose one then press “ “ to check the the relative fault.
1.4.7.2rE parameter
when screen display “rE”, press” “key, then press “+” and “-” can switch between “CLr”
and “rE5",when display “CLr” press “ “ 3S can delete all the record of fault, when
display “rE5" press “ “ 3S can reset the default value of the adjustable parameter "P01
~ P07" in the "tS" submenu. press “Reset” to exit.
figure 2

4
1.4.7.3tS parameter
when screen display “tS”, press” “key, then press “+” and “-” can switch between “P01 to
P11", choose one press “ “ come into this item setting state, then press “+” and “-” to
change the value. Press “ “ return to view P01-P12 menu, then press “Reset” to save
and exit. P01-P12 description see below table.
Code
Para m e ters descriptio n
adju sta ble range
defa ult
P01
The dela y tim e o f pump a fter sto p h eating
1～20m in
20m in
P02
Heatin g s tart the tem p erature d ifference
5～20℃
15℃
P03
Flo or Heating s tart the tem p erature
diffe rence
5～20℃
8℃
P04
W ater ta nk sta rt the tem peratu re
diffe rence
5～10℃
5℃
P05
W he ther the syste m is equ ipped with
wate r ta nk
O n：w ith ta nk OFF：with out tank
O FF
P06
O utd oor te m p eratu re con trol
com pen sation offset
30～50℃
30℃
P07
Heatin g o utdoo r te m p eratu re control
com pen sation curve
C01
～C10,C--
C--
P08
Boiler pow er sele ctio n
01～09 units
6units
P09
A08 fa ult detect c hoic e
00:no d ete ct A08
；
03：dete ct A08
00
P10
Heatin g c om fort m ode (th erm al bala nce
optio n)
O N：H eating a ll the tim e
O F F：Stop h eating after reach ed
TEM P 2 0 m inutes
O FF
P11
Heatin g type c hoic e
00：R adiator/01:floor ra dia tor
00
P12
Ta nk h eating choice
O N：ru nnin g O FF: n o running
O N
1.5 fault and recovery
When the screen display the following fault code, it indicates that the boiler is out of order. A is
Locked type fault and needs to be removed manually; F is the automatic recovery type fault, which
will be automatically recovery when the fault disappears.
fault code fault description type
Locked
Locked
Locked
Locked
Auto reset
Auto reset
Auto reset
Auto reset
electric leakage
Temperature limiter failure (mechanical thermostat disconnection)
The heater temperature beyond 90 °C
Temperature sensors detect (normal heat for 5 minutes,the NTC of the
heating or the NTC of hot water detect the temperature change are not
more than 3 ℃, and more than 40 ℃ no longer detect)
heating NTC fault(heating NTC open circuit, short circuit or wire loose)
Outdoor temperature sensor fault (outdoor NTC open circuit,
short circuit or wire loose.)
water tank temperature sensor fault (water tank NTC open
circuit, short circuit or wire loose.)
water pressure switch fault
Auto reset
System not circulation failure (temperature gradient is greater than the
set value, the decision for water pump fault system, down 5 ℃
temperature automatic recovery)
A02 AC contactor failer
Locked

5
1.6 Function
ATemperature setting & control
1.Heating temperature setting range:30-80℃.
Start the temperature difference:5-10℃
2.Water tank temperature setting range:30-60℃.
Start the temperature difference:5-20℃
*annotation: Tw---Actual temperature;
Ts---setting temperature;
△T--- Start the temperature difference
B:Anti-freezing function
one level anti-freezing:when system temperature<=8℃,pump running, until system
temperature>=10℃ the pump stop. the screen display “FD”.
two level anti-freezing:when system temperature<=5℃,pump running, heater working,
until system temperature>=30℃ the heater stop, and the pump delay stop. the screen
display actual temperature.
1.7System of water injection
The boiler equipped with manual injection/water inlet valve, when running process, the
heating system pressure drops below 1 bar, users should open the valve slowly to filling
water pressurization system, until the system pressure returned to normal.
Generally, at static normal temperature, the system should be kept at about 1bar, and
the water pressure should be kept between 1bar and 1.5bar at work.
The water injection valve rotates clockwise to close, turning counterclockwise to open.
figure 3
filling water valve

6
2. Installation
2.1running conditions and installation location.
Connect the electric heating boiler to the utility grid must be approval by the
local power supply company.
Any person concerned must request temporary approval for access to high
electrical power and apply for direct heating of the room.
If a new heating or remodeling heating is established, we suggest that the
professional staff should design it carefully. Professional installation by
authorized service company is the condition of manufacturer's warranty.
Therefore, please refer to our contract partner for boiler connection, he
should connect the boiler and provide the electric heating operation prompt.
Any connection work with utility power and any electrical installation must
be conducted by qualified professional workers in accordance with UBP SR
No.74/1 996 Coll.
The electric heating boiler must be permanently connected to the utility
power distribution network. In the electric heating boiler, a device should be
built in to break off a main switch, in which the distance of all the pole
breaking contacts is at least 3mm, and the operating guidance is observed.
The installation of the electric heating boiler should be located in such a
position that it should be able to allow any necessary access during
maintenance or overhaul inspection. The minimum distance between the
boiler and the fixed barrier is shown in figure 3.
During assembly, the professional workers of the company shall be required
to conduct systematic demonstration and training of system operation. The
warranty certificate of electric heating boiler must be confirmed by
professional workers after commissioning and adjustment.
The electrical equipment of the boiler
is designed to operate without any
electrical qualification. The operator
may operate the control device only
and follow the instructions of the
manual or service company. The
electrical apparatus shall not be
tampered with in maintenance.
From the requirements of the
installation of electric heating boiler,
water supply should be handled by the
region in order to add water and
discharge water. In addition, the
installation must have a sufficiently
smooth wall area (electrically heated
boilers are suspended on the wall) Min recommended
figure 4

7
Electric boiler design in the STN330300 and ordinary A5 / AB5 STN332310 environment
(namely the temperature range from + 5 ℃ to 40 ℃, humidity depends on temperature,
maximum 85%). The boiler shall not be installed in the 0, 1 and 2 areas of STN332135-1,
nor shall it be installed in any room, bathroom, washing area or shower room with a
bathtub. However, where it can be installed 3 area, such as if possible to clean the water
(as in schools, factories, sports clubs and used in the public service area public drinking
hole, pipe and nozzle, etc.), also can't install electric boiler.
If the boiler is installed in an acceptable place, it will provide protection against
current accidents at the same time.
2.2 boiler installation
To hang the boiler on the wall, it is
recommended to use the expansion
screw (the delivery attachment), which
should be fixed on the wall in advance
(see figure 6). The main body of the
heater structure with water pump and
accessories shall be suspended on the
fixed expansion screw. The boiler cover
is connected to the back wall by screws
and can be disassembled. Such a place
should be determined before the boiler is
installed, where there may be necessary
repair work without any major limitations.
If the boiler is to be installed in an open
system, the water column of the heating
system should produce at least 1 bar
pressure.
figure 5
figure 6

8
2.3. Pipe connection.
A· pipe installation:
Before installation, carefully clean the residues and dirt in all the pipes to avoid
affecting the normal operation of the boiler.
According to the the graphic of 4.1 section and the corresponding symbols on the
bottom plate to connect pipe.
The outlet of the relief valve must be connected to the floor drain or drain, so that the
water will not flow to the ground when the heating system overpressures. Otherwise,
the wall manufacturer will not be responsible if the leakage pressure causes the
room to be flooded.
In the heating system of the thermostatic valve, the water circulation may be
completely stopped. In this case--the bypass flow is passed through a device that
does not have any thermostatic valves, or used --by-pass.
B.Water quality characteristics of water system:
When the water hardness more than 25 ° Fr, should use the softening treatment of
water, avoid boiler internal water hardness or corruption and scaling. It should be
noted that even a few millimeters of scale can lead to low thermal conductivity and
cause serious problems caused by overheating of boiler.
If the system is very large (large capacity of water) or frequent filling water into the
system, must be to deal with water, if must be part of the drain or completely
emptying system, water injection is the treated water must be used.
C. antifreeze system, antifreeze, additives or inhibitors.
Boiler has anti-freezing function, when the heating system water temperature is less
than 6 ° C, boiler will start heating mode.
If the power supply of the boiler is cut off, the anti-freeze function fails.
If necessary, can use antifreeze, additives or inhibitors, but these fluid
manufacturers must ensure that the liquid medicine, without damaging the wall
hanging furnace heat exchangers and other parts, no damage to the heating
equipment. The use of antifreeze, additives and inhibitors not specified for heating
equipment and wall hanging furnaces is prohibited.
Filters and settler collectors should be regularly checked and cleaned.
Before adding water to the heating system, it is necessary to check the pressure of the
expansion tank. If necessary, it should be filled with pressure in the range of 1-1.3bar.

9
2.4 electrical installation
Connect the power cord
Before installation, the user shall establish a power supply device, which shall be equipped with the
main power switch of heating, protection equipment and other modifications to the home wiring,
including initial modification and application for electricity charges.
The casing used for wire connection, voltage regulator input and HDO, and possible cascade
interconnection (with small package parts attached) is located in the lower left corner of the bracket
(see above). In addition, external protection terminals should be installed (brass bolt M6).
Before installing the protection bolt, the sides and outside of the cabinet must be cleaned, and all the
places near the bolt will be unrestricted to the metal surface. Under the head of the inside of the
cabinet, use the end of the cable terminal to connect the protection wire. A brass nut with a lock
washer is tightened from the outside. Use another nut to connect to the second protection line.
After connecting the power cord, it is necessary to check whether the nuts of all power terminals and
contactor are properly tightened.
Simple and complex control elements, such as programmable (daily or weekly program) and indoor
regulators, can be purchased at the manufacturer and its contractual partners of the electric heating
boiler. In order for the electric heating boiler to work correctly, it is absolutely necessary to have the
regulator of the belt voltage output, which means that no external voltage should be supplied. The
required regulator output contact load capacity 230/0.1. An indoor regulator with no voltage output is
connected to PR1 and PR2 terminals.
indoor thermostat and remote control.
Note: indoor thermostat contacts must be clean. The output voltage 220V May damage the electronic
circuit. When installing day or week program indoor thermostat or time switch, should avoid to use the
device switch contact to switch on the power, they should be according to the device type by power
supply or batteries to power.
The designer must consider comprehensively the suitability assessment for the combination of
external equipment to remove power level boilers. Consideration must be given to boiler
functions related to households or houses and external equipment mentioned. The
manufacturer shall not be liable for any improper installation of the design.
1.Three - way connecting terminal
2.Water tank NTC connecting terminal
3.Indoor temperature controller connecting terminal
4.outdoor temperature controller connecting terminal
figure 7

10
3. Service and maintenance.
3.1 Adjustment
Adjustment can only be done by qualified personnel.
All maintenance and maintenance of the system and safety components shall
be subject to debugging.
Before boiler start
Open the stop valve between all boiler and system.
Water injection into the system to ensure that all air in the boiler and system is
discharged from the automatic exhaust valve of the boiler and heating system.
Check whether the heating system, hot water system, connector and boiler are
leaking.
Check whether the boiler's power connection is correct.
Check whether the boiler grounding is good.
Check to see if there are any corrosive liquids or articles near the boiler.
Boiler start-up
Close boiler power switch.
Set the winter mode and make sure that the indoor temperature controller is closed,
when the heat tube in the heat exchanger works, the boiler starts to run
automatically and is controlled by the regulation and safety control.
the running process is without power, the heating tube stops heating, and the wall
hanging when the power supply is restored will start heating.
During running, the power is off, the heating tube stops heating, and the boiler
will start heating when power is restored.
Run time check
Check the circulation between boiler and heating system.
Check whether the boiler works well by opening a closed room temperature
controller or timer.
Turn off
Press 5S.
The boiler turn off, but the PCB is still supplied power.,
The heating function is stopped, display ;The anti-freeezing is on line.
When shut down the power of the boiler , the anti-freezing function will failure.
In winter, if long time not to use the boiler, please empty the water of system
avoid to freezing, or inject antifreeze in the system.

11
3.2maintenance
The installed electric heating boiler does not require any maintenance. However, it is
suggested that the user conduct the network inspection, and it is best to carry out an annual
inspection by the after-sales service company (not part of the warranty) before the heating
season begins. In this professional inspection, all electrical connections and water
connections should be tightened, water pumps are cleaned, safety valves and exhaust
valves and all safety elements should be checked, and the function of the boiler should be
checked in the end.
When the boiler is running in closed heating system equipped with expansion tank, the
pressure on the pressure indicator must be checked periodically. If the residual pressure
drops below the limit indicated by the installation company under cold condition, the system
should be inspected by professionals. This is not effective for the first heating, for example,
when the air in the system is released. Under such circumstances, the system should be
filled with water according to the corresponding standards.
In open systems, check the water capacity in the expansion tank and fill it up if necessary.
The following operations can only be carried out by qualified professionals, such as
our local distributor or after-sales service department.
Boiler seasonal inspection
It is recommended that the boiler be inspected at least once a year:
ŸControl device and safety device (leakage switch, contactor, thermostat, etc.) must
function correctly.
ŸThe heat exchanger must be clean and follow the introduction of the next chapter.
ŸIn the cold machine state, the water pressure is 0.1mpa, otherwise the value should be
adjusted.
ŸThe expansion tank must be full.
ŸThe circulation pump is not jammed.

12
3.3failure recovery
Diagnosis
The boiler is equipped with advanced self diagnosis system. If a fault occurs, the boiler will
display the corresponding code on the display screen. There are some failures (showing "A")
to stop the boiler. If you want to resume operation, you must catch the reset button for 1
seconds. Other faults (indicating "F") result in shutdown. The boiler can run automatically
when the fault is removed and automatically reset.
The reasons for the failure of the part of the fault table listed below and the methods that
users can solve themselves.
If the fault is solved for the two time, you can not exclude it. Please contact the Thermex
service staff.
Fault description Code possible reason Solution
Heating system water does not circulate
temperature limiter
fault
temperature limiter damage
more air in heating system
the heater is
over 90 ℃
Abnormal
temperature
rise
CH NTC fault
outdoor NTC fault
Tank NTC fault
WPS fault
No circultate
electric leakage
Heating system water does not circulate
more air in heating system
Temperature sensors detect (normal
heat for 5 minutes,the NTC of the
heating or the NTC of hot water detect
the temperature change are not more
than 3 ℃, and more than 40 ℃ no
longer detect)
NTC open circuit, short circuit or wire loose
NTC open circuit, short circuit or wire loose
NTC open circuit, short circuit or wire loose
water pressure switch fault
water shortage in system
water shortage in system
pump fault
check wire
no heating
check the positioning and operation
of the heating sensor
check pump and empty air in system
check pump and empty air in system
check pump and empty air in system
check CH NTC or change
check wire or change NTC
check wire or change NTC
check wire or change NTC
fill the system to 1-1.5bar
check the water pressure switch
fill the system to 1-1.5bar
check pump
A02
electric leakage
AC contactor failer check AC contactor

13
4.Technical features and parameters.
4.1. Dimensions and joints.
legend
1. Heating system inlet G3/4.
2. Water inlet G1/2.
3. The heating system will return
to G3/4.
figure 8
1
23

14
4.2. Structure drawing and main parts
1
2
3
6
5
89 10
11
12
14
13
16
17
19
20
21
4
15
18
7
1
2
3
6
5
89 10
11
12
14
13
16
17
19
20
21
4
15
18
7
18~24KW
6~8KW
1
2
3
6
5
89 10
11
12
14
13
16
17
19
20
21
4
15
18
7
9~15KW
legend
1.temperature limiter
2.heating water supply pipe
3.Ac contactor
4.connecting terminal
5.filling valve
6.by-pass pipe
7.water outlet valve
8.heating outlet
9.fill water inlet
10.heating return
11.Automatic exhaust valve
12.CH NTC
13.the heating tank
14.heating tube
15.expansion tank
16.the pipe to expansion tank
17.heating return pipe
18.safety valve
19.water pressure switch
20. pump
21.water pressure meter
22.Current transformer
22 22
22

15
4.3 the water system
1.CH NTC
2.expansion tank
3.by-pass
4.heating outlet
5.water tap
6.heating return
7.filling valve
8.pump
9.safety valve
10.water pressure switch
11.the heating tank
12.heating temperature limiter
figure 10

16
Pump flow - lift graph
pump performance curve
boiler head loss
figure 11