Bosch THERM 1000 O Guide

Installation and use manual
Gas tankless water heater
THERM 1000 O
6720818788-00.3V
W6 / W10 KB
6 720 818 788 (2015/11) EG
Please read the installation instructions before installing the appliance!
Please read the operating instructions before operating the appliance!
Please observe the safety instructions in the operating instructions!
The installation site must meet the requirements for sufficient ventilation!
We suggest that the installation should be carried out by an authorized company Bosch!

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2 | Index
Index
1 Symbology . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
1.1 Symbology . . . . . . . . . . . . . . . . . . . . . 3
1.2 Safety instructions . . . . . . . . . . . . . . . 3
2 Instructions regarding the appliance . . . . . 4
2.1 Category and type . . . . . . . . . . . . . . . 4
2.2 List of models . . . . . . . . . . . . . . . . . . . 4
2.3 Material contained in the package . . . 4
2.4 Description of the appliance . . . . . . . 4
2.5 Rating plate . . . . . . . . . . . . . . . . . . . . . 4
2.6 Special accessory (not contained in the
package) . . . . . . . . . . . . . . . . . . . . . . . 4
2.7 Dimensions . . . . . . . . . . . . . . . . . . . . . 5
2.8 Appliance construction . . . . . . . . . . . 6
2.9 Electrical schema . . . . . . . . . . . . . . . . 7
2.10 Operation description . . . . . . . . . . . . 8
2.11 Technical features . . . . . . . . . . . . . . . 9
3 Use . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
3.1 Before operating the appliance . . . . 10
3.2 Batteries . . . . . . . . . . . . . . . . . . . . . . 10
3.3 Switch on and off . . . . . . . . . . . . . . . 10
3.4 Output adjustment . . . . . . . . . . . . . . 11
3.5 Temperature adjustment . . . . . . . . . 11
3.6 Bleeding of the appliance . . . . . . . . . 11
3.7 Cleaning the front of the appliance . 11
3.8 Fault diagnosis . . . . . . . . . . . . . . . . . 12
4 Regulation . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
5 Installation (only by qualified technicians) . .
12
5.1 Important information . . . . . . . . . . . 12
5.2 Choice of installation site . . . . . . . . . 12
5.3 Fixing of the appliance . . . . . . . . . . . 14
5.4 Water connection . . . . . . . . . . . . . . . 14
5.5 Gas connection . . . . . . . . . . . . . . . . . 14
5.6 Start-up . . . . . . . . . . . . . . . . . . . . . . . 15
5.7 Remove the front . . . . . . . . . . . . . . . 15
6 Adjustments (only by qualified technicians)
15
6.1 Adjustment of the appliance . . . . . . 15
6.2 Conversion to another type of gas . . 15
7 Maintenance (only by qualified technicians)
16
7.1 Periodic maintenance works . . . . . . 16
7.2 Combustion gas control device . . . . 16
8 Problems . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
9 Environmental protection . . . . . . . . . . . . . . 19

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Symbology | 3
1 Symbology
1.1 Symbology
Warnings
The following keywords are defined and can be used in this
document:
•NOTICE indicates a situation that could result in damage to
property or equipment.
•CAUTION indicates a situation that could result in minor to
medium injury.
•WARNING indicates a situation that could result in severe
injury or death.
•DANGER indicates a situation that will result in severe injury
or death.
Important information
Other symbols
1.2 Safety instructions
If you smell gas:
▶ Close the gas shut-off valve.
▶ Open the windows.
▶ Do not switch on any electrical switches.
▶ Extinguish possible flames.
▶ Contact from another location to the gas company and to an
authorized service Bosch.
If you smell gas flue:
▶ Switch the appliance off.
▶ Open doors and windows.
▶ Request a visit from an authorized service Bosch.
Assembly, modifications
▶ The appliance's assembly, as well as the installation
modifications can only be carried out by an authorized
service Bosch.
▶ The ducts that conduct the gas flue should not be modified.
▶ Do not close or reduce the openings for air circulation.
Maintenance
▶ The maintenance of the appliance should only be carried out
by an authorized service Bosch.
▶ The user of the appliance should ensure, within regular
intervals, technical interventions of control and
maintenance of the appliance.
▶ The appliance should be maintained annualy.
▶ Only original spare parts should be used.
Highly flammable and explosive materials
▶ Flammable materials should not be stored or used (paper,
solvents, paint, etc.) near the appliance.
Combustion air and ambient air
▶ To avoid corrosion, combustion air and ambient air should
be free from aggressive substances (e.g. halogenated
hydrocarbons which contain chlorine and fluorine
compounds).
Clarifications for the user
▶ Inform the user about the operation and handling of the
appliance.
▶ Inform the user that he/she should not perform
modifications or repairs on their own.
Damages caused by errors of use
Errors of use may cause material or personal damages.
▶ Ensure that children do not play with the appliance or use it
without the supervision of an adult.
▶ Ensure that the users are well instructed on how to operate
the appliance.
Warnings in this document are identified by a
warning triangle printed against a grey
background.
Keywords at the start of a warning indicate the
type and seriousness of the ensuing risk if
measures to prevent the risk are not taken.
This symbol indicates important information
where there is no risk to people or property.
Symbol Meaning
▶ Operational step
Reference in another point in the document
• Enumeration/Item of a list
– Enumeration/Item of a list (level 2)
Table 1

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4 | Instructions regarding the appliance
2 Instructions regarding the appliance
2.1 Category and type
2.2 List of models
[W] Gas tankless water heater
[D] Display hot water temperature
[6] Capacity (l/min)
[B] Electronic ignition powered by type LR20 batteries
(2x1.5V)
[GN] Appliance set for natural gas H
[GLP] Appliance set for liquefied petroleum gas
2.3 Material contained in the package
• Gas heater
• Fixing elements
• Installation and use manual
2.4 Description of the appliance
• Appliance to fix onto walls,
• Ignitionbyelectronicdevicecontrolledbytheopeningofthe
water valve,
• LPG/Natural gas burner.
• Safety devices:
– Ionization sensor against accidental extinction of the
burner flame,
– Control device of the combustion gases that switches the
appliance off if the conditions of gas flue exhaustion are
poor,
– Temperature limiter which avoids the overheating of the
combustion chamber,
– Relief and drain valve.
2.5 Rating plate
The rating plate is located on the cover of the appliance, on the
right side.
This plate has the indications on the performance of the
appliance, appliance's code, approval data and production
coded data (FD).
2.6 Special accessory (not contained in the
package)
• Conversion kit of natural gas for LPG and LPG for natural
gas. The conversion to another type of gas should only be
carried out by an authorized service BOSCH.
Model W6 / W10/ WD10 KB
Category II2-3
Type B11BS
Table 2
W6 B GN/GLP
W/WD 10 B GN/GLP
Table 3
Code
numbers
Wobbe Index (Wi)
(15 °C) Gas type
G20 45.67 MJ/m3Natural gas group 2H
G30 80.58 MJ/m3LPG
group 3B/P
Table 4

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Instructions regarding the appliance | 5
2.7 Dimensions
Fig. 1
6720818788-03.2V
Appliance A B C D E
Water inlet Gas inlet
Cold/Hot GN/GLP
W6 300 484 170 151 Ø 95 1/2” 1/2”
W10/WD10 320 526 170 220 Ø 115 1/2” 1/2”
Table 5 Dimensions in mm

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6 | Instructions regarding the appliance
2.8 Appliance construction
Fig. 2
[1] Flue pipe connection
[2] Control device of the combustion gases
[3] Chimney
[4] Temperature limiter
[5] Combustion chamber
[6] Ignition probes
[7] Burner
[8] Ignition unit
[9] Gas flow regulator
[10] Temperature Sensor (for WD model only)
[11] Electro valve 1
[12] Outlet hot water
[13] Gas inlet
[14] Fixation point
[15] Ionization probe
[16] Water flow regulator
[17] Batteries case
[18] Bleeder screw (pressure relief)
[19] Cold water inlet
1
2
3
5
6
4
7
8
9
15
14
10
12
11
13
6720818788-07.1V
16
17
18
19

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Instructions regarding the appliance | 7
2.9 Electrical schema
Fig. 3
[1] Control device of the combustion gases
[2] Temperature limiter
[3] Ignition unit
[4] Micro switch
[5] Electro valve
[6] ON/OFF switch
[7] Batteries (2x 1.5V)
[8] Temperature Sensor (for WD model only)
[9] Temperature Display (for WD model only)
1
2
3
8
4
5
7
6
9
6720818788-04.1V
DANGER:
Burns!
Water temperature increase.
▶ Check the setting of the ignition flow after
the appliance's maintenance works.

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8 | Instructions regarding the appliance
2.10 Operation description
Hot water
This heater is equipped with electronic automatic ignition, thus
its operation becomes simple.
For such it is enough to:
▶ Open the gas and water shut-off valves and check the
tightness of all the connections.
▶ Place the On/Off button (Fig. 4, [3]) in the operating
position.
After this procedure, when opening a hot water point, the
ignition will occur automatically.
Spark shut-down when the ignition time is exceeded
If it is not possible to obtain the flame within the safety interval
stipulated, a gas shut-off is carried out in the valve.
The presence of air in the gas supply tube (initial start-up of the
appliance or start-up after long periods of inactivity) may cause
a delay in the ignition.
In this case and if the ignition attempt is too long, the safety
devices block the operation of the appliance by interrupting the
gas flow.
Safety shut-down due to an excessively heated water
temperature
The ignition unit detects the temperature of the water through
the temperature limiter placed in the combustion chamber. In
the event that it detects excessive temperature, it causes a
safety shut-down.
Re-start after safety shut-down
To put the appliance back into operation after having caused a
safety shut-down:
▶ Close and re-open a hot water point.

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2.11 Technical features
Technical features Symbol Units W6 W10 /WD10
Output
Nominal input in standard conditions Qn kW 11.8 20
Efficiency η % 84.0 84.0
Data relating to the gas1)
1) Hi 15 °C - 1013 mbar - dry: Natural gas 34.02 MJ/m3(9.45 kWh/m3)
L.P.G.: Butane 45.65 MJ/kg (12.68 kWh/kg) - Propane 46.34 MJ/kg (12.87 kWh/kg)
Supply pressure
Natural gas H G20 mbar 20 20
L.P.G. (butane/propane) G30 mbar 27.8 27.8
Consumption
Natural gas H G20 m3/h 1.25 2.12
L.P.G. (butane/propane)2)
2) The quantity of cylinders installed should be proportional to the maximum volume of the heater's gas consumption
G30 kg/h 0.92 1.55
Number of injectors 8 14
Gas connection NG 1/2‘‘
L.P.G. 1/2‘‘
Data relating to the water
Maximum admissible pressure3)
3) Considering the effect of the dilation of the water, this value must not be exceeded
Pw bar 10 10
Temperature increase °C 25 25
Flow rate obtained in the mixer l/min 6 10
Minimum pressure for nominal flow Pwmin bar 0.3 0.3
Data regarding the combustion products4)
4) For nominal heat output
Average temperature of the flue gas °C 160 165
Diameter of the flue collar mm 95 115
Generalities
Weight (unpacked) kg 6.2 8.7
Height mm 484 526
Width mm 300 320
Depth mm 151 220
Table 6

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10 | Use
3 Use
Fig. 4
[1] Gas flow
[2] Water regulator
[3] ON/OFF switch
[4] Temperature Display (for WD model only)
3.1 Before operating the appliance
3.2 Batteries
Insert batteries
▶ Insert in the batteries box two type D batteries (1.5V).
Fig. 5 Insert batteries
Precautions while using batteries
• Do not dispose of used batteries in the bin.
• Deliver them to the existing selective collection sites for its
recycling.
• Do not reuse used batteries.
• Use only the indicated type of batteries.
• Use alkaline batteries.
3.3 Switch on and off
Switch on
▶ To switch on place the ON/OFF switch in I position.
Fig. 6 Switch on
Switch off
▶ To switch off, place the ON/OFF switch in O position.
6720818788-05.1V
CAUTION:
▶ The initial start-up of the heater must be
done by a company from the Authorized
Service Bosch who will provide the user
with all the information required for the
proper operation thereof.
6720643462-05.1V
6720643462-06.1V

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Use | 11
Fig. 7 Switch off
3.4 Output adjustment
Less hot water.
Decrease output.
Fig. 8
More hot water.
Increase output.
Fig. 9
3.5 Temperature adjustment
▶ Turning counter clockwise.
Increases the flow and decreases the temperature
Fig. 10
▶ Turning clockwise.
Decreases the flow and increases the temperature
3.6 Bleeding of the appliance
If there is a risk of freezing, you need to proceed as follows:
▶ Close the appliance's water shut-off valve.
▶ Open a hot water point.
▶ Loosen the relief screw located in the water inlet tube
(Fig. 11).
▶ Empty all the water contained inside the appliance.
Fig. 11 Relief screw
3.7 Cleaning the front of the appliance
▶ Only clean the front of the appliance with a cloth and some
detergent.
The output adjustment field is greater than the
one printed on the control panel. This one only
indicates the minimum and maximum direction.
6720643462-07.1V
Do not use corrosive and/or abrasive
detergents.
6720643462-11.1V

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12 | Regulation
3.8 Fault diagnosis
To identify possible faults refer to Chapter 8.
4 Regulation
The appliance comply with local standards.
5 Installation (only by qualified
technicians)
5.1 Important information
▶ Before carrying out the installation, consult the gas supply
company and the local norms in force.
▶ Fix a gas shut-off valve as close as possible to the appliance.
▶ After completion of the gas network, thorough cleaning
must be done and a tightness test carried out to avoid
damage due to excess pressure in the gas valve.
This has to be carried out with the gas valve of the appliance
closed.
▶ Check if the appliance to be installed matches the type of
gas supplied.
▶ Check if the flow and pressure supplied by the gas regulator
installed are as indicated for the consumption of the
appliance (technical data in the table 6);
Heater installed with LPG gas - Pay attention to the
maximum volume consumed by the heater, as the number of
cylinders should match the consumption. In the event of the
number of cylinders being minor than the consumption of
the heater, the water may not heat and the gas may freeze,
making the formation of olein possible which damages the
internal parts of the appliance.
5.2 Choice of installation site
Provisions regarding the installation site
• Do not install the appliance in rooms with a volume less than
8 m3(do not consider the volume of the furnishings, as this
does not exceed 2 m3).
• Comply with the specific determinations of each country.
• Install the heater in a well ventilated site, away from negative
temperatures, where there is a combustion gas duct.
• The heater may not be installed on a heat source.
• To avoid corrosion it is necessary for the combustion air to
be free from aggressive substances. An example of
particularly corrosive materials are halogen hydrocarbons
present in solvents, paints, glues, motor gases and various
domestic detergents. If necessary, take the proper
measures to correct the conditions.
• Respect the minimum installation measures indicated in
Fig. 12.
If there is a risk of freezing:
▶ Switch the appliance off,
▶ Take out the batteries,
▶ Bleed the appliance (section 3.6).
CAUTION:
▶ In the area of the burner, the front may
reach high temperatures with a risk of
burns in the event of contact.
DANGER: Explosion!
The installation, maintenance and repair
should only be carried out by an accredited
company Bosch.
▶ See the table 8 to find solutions for possible
problems (solutions followed by * should
only be carried out by an accredited
company Bosch).
DANGER: Explosion
▶ Always close the gas shut-off valve before
carrying out any work in components that
conduct gas.
The installation, the electrical connection, the
gas installation, the installation of the flue/
intake duct, as well as the first start-up are
operations that should be carried out
exclusively by a company from the Authorized
Service Bosch.
The appliance may only be used in the
countries indicated on the rating plate.

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Installation (only by qualified technicians) | 13
Fig. 12 Minimum distances
▶The height of the flue pipe should be to ensure that the
pumping force is not less than 3Pa as the determination
principle, generally should not be higher than 10m;
▶ The length of smoke exhaust pipe horizontal part L ≤ 4m,
and the horizontal front end can’t be inclined downward and
has a certain elevation angle. The outdoor bottom part of the
flue pipe is provided with a water discharging structure;
▶ The elbow of smoke exhaust pipe should be 90°, the number
of elbows should not be more than 4;
▶ The height of H ≥ 350mm;
▶ Flue pipe top should have a false ogive device to avoid the
wind, rain, snow, its position should not in the wind band,
and should have a safety distance from its smoke mouth to
the surrounding buildings.
Combustion gases
• All of the heaters should obligatorily be connected in an
airtight way to a flue gas duct of proper dimension.
• Avoid change of direction.
• The flue duct should:
– be vertical (horizontal sections should be reduced to a
minimum or completely eliminated)
– be thermally insulated
– have an outlet above the maximum point of the roof, in
the event of this not being possible, ensure that between
the highest point of the house chimney and the roof there
is a minimum distance of 40 cm.
• The combustion gas duct should be duly connected to the
flue collar of the appliance. Diameter features of the flue
collar are indicated in the table with the appliance's
dimensions (table 5).
• A protective terminal should be installed against wind/rain
on the edge of the flue duct.
If these conditions cannot be guaranteed, a different site must
be chosen for the gas flue and intake.
Superficial temperature
The maximum superficial temperature of the appliance, with
the exception of the combustion gas flue device, is lower than
80 °C. Special protective measures are not necessary for
combustible construction materials, nor for furnishing.
Air Intake
The site earmarked for the installation of the appliance must
have an area of air supply as per the table.
The minimum requirements are listed above, but the specific
requirements of each country have to be respected.
DANGER: Danger to life caused by
combustion gas leak!
Leaks in the combustion gas duct may cause
combustion gases leaks through the appliance
installation compartment and may result in
personal injury or death.
▶ Check and guarantee that the combustion
gas duct is airtight after installation.
6720818788-08.1V
False ogive
Flue pipe
L
Air outlet
Air inlet
Air
h
CAUTION: Danger to life caused by
combustion gas leak!
In the case of rigid ducts, ensure that the edge
of the flue duct is placed between the edge of
the chimney and the ring.
Appliance Minimum useful area
W6 60 cm2
W10/WD10 90 cm2
Table 7 Useful areas for air intake

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14 | Installation (only by qualified technicians)
5.3 Fixing of the appliance
To fix the appliance to the wall
▶ Fix the appliance vertically, using the provided fixing
accessories.
Fig. 13 Fixing of the appliance
5.4 Water connection
It is advisable to previously bleed the installation, as the
existence of impurities may cause volume reduction and, in the
worst case, water flow obstruction.
▶ Identify the cold water pipe (Fig. 14, [B]) and the hot water
pipe (Fig. 14, [A]), to avoid possible confusion.
Fig. 14 Water connection
[A] Hot water
[B] Cold water
5.5 Gas connection
The gas connection to the heater must absolutely comply with
the terms of local Standards in force.
▶ Firstly check if the heater to be installed matches the type of
gas supplied.
▶ Check if the flow and the pressure supplied by the gas
regulator installed is sufficient for the heater's consumption
(see technical features, Tab. 6)
Installation with flexible tube (LPG)
The installation, if done with flexible tube (not metal), only for
appliances designed to be connected to a LPG cylinder, must
comply with the following:
• must have a possible minimum length of at most 1.5 m;
• the tube must comply with applicable standards;
• must be controllable all the way through;
• must not come near areas where heat is released;
• avoid folds or other bottlenecks;
• the connection at the ends must be made with proper
accessories and tabs without grooves.
▶ Check if the supply tube is clean.
▶ Fix a gas shut-off valve as close as possible to the appliance.
▶ In the case of an installation with connection to a gas supply
network, you must use metal tubes in accordance with the
applicable standards.
Installation with connection to a gas supply network
▶ In the case of an installation with connection to a gas supply
network, you must use metal tubes in accordance with the
applicable standards.
CAUTION:
▶ Do not ever support the heater on the water
and gas connections.
To avoid problems caused by changes in
temperature occurring in the supply, it is
advisable to fit a non-return valve and a
pressure regulating valve at the appliance inlet.
6720643462-12.1V
6720818788-06.1V
DANGER:
Non-compliance with legal standards
applicablemaycausefireorexplosion,causing
material damage or personal injury or even
death.
Only use original accessories.
DANGER: Danger to life caused by gas leak.
▶ Proceed to replace the tube if you find that
it is dry and fragile.
▶ Replace the tube at least every four years,
or according to the legislation in force.

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Adjustments (only by qualified technicians) | 15
5.6 Start-up
▶ Open the gas and water shut-off valves and check the
tightness of all the connections.
▶ Insert correctly type D batteries of 1.5 V (Fig. 15).
Fig. 15 Batteries placement
▶ Check the proper operation of the combustion gas control
device, proceed as explained in the point “ 7.2 Combustion
gas control device”.
5.7 Remove the front
To remove the front of the appliance:
▶ Remove gas regulator.
▶ Loosen the main switch cable.
▶ Loosen the fixing screws from the chassis (Fig. 16).
Fig. 16 Remove the front
▶ Simultaneously moving in your direction and upwards,
release the front of the two back fins.
6 Adjustments (only by qualified
technicians)
6.1 Adjustment of the appliance
Natural gas
The appliances for Natural Gas (G20) are supplied sealed
having been set in the factory for the values shown on the rating
plate.
Liquefied petroleum gas
Appliances for L.P.G. (G31/G30) are supplied having been set
in the factory for the values shown on the rating plate.
6.2 Conversion to another type of gas
Only use the original conversion sets.
The conversion should only be carried out by a company from
the Authorized ServiceBosch. The original conversion sets are
supplied with fitting instructions.
6720643462-05.1V
6720643462-14.1V
The sealed components must not be broken.
The appliances must not be operated if the
supply pressure is less than 17 mbar or greater
than 25 mbar.
The appliances must not be operated if the
supply pressure is:
- LPG: less than 21 mbar or greater than 32
mbar.
DANGER: The following operations described
below should only be carried out by a
company from the Authorized Service Bosch.

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16 | Maintenance (only by qualified technicians)
7 Maintenance (only by qualified
technicians)
To guarantee that the gas consumption and the gas emission
are maintained at the adequate values, we recommend the
inspection of the appliance annually and, if necessary,
maintenance works should be carried out.
Maintenance instructions
▶ Only use original spare parts.
▶ Order the spare parts in accordance with the appliance's
spare parts catalog.
▶ Only the following lubricating greases may be used:
– In the hydraulic part: Unisilikon L 641 (8 709 918 413)
– Threaded connections: HFt 1 v 5 (8 709 918 010).
▶ Replace the joints and O-rings removed with new ones.
Start-up after completion of maintenance works
▶ Re-tighten all the connections.
▶ Operating the appliance again (chapter 3).
▶ Check that there are no leaks.
7.1 Periodic maintenance works
Functional check
▶ Check the proper operation of all the safety, regulation and
verification elements.
Combustion chamber
▶ Determine the degree of cleanliness of the combustion
chamber.
▶ If it is dirty:
– Dismantle the combustion chamber.
– Clean the chamber by applying a strong jet of water.
▶ If the dirt persists: dip the sheets in hot water with detergent
and clean carefully.
▶ If necessary: descale the inside of the combustion chamber.
▶ Fit the combustion chamber using new joints.
Burner
▶ Inspect the burner each year and clean it if necessary.
▶ In the case of it being very dirty (grease, soot): disassemble
the burner, dip it in hot water with detergent and clean it
carefully with a brush. Do not use metal objects in the
cleaning operation (e.g.: metal brushes) of the injectors.
Water filter
▶ Close the water inlet valve.
▶ Open a hot water tap.
▶ Replace the water filter (Fig. 11).
7.2 Combustion gas control device
Operation and precautions
This control device verifies the chimney flue conditions and in
casethesearepoor,itswitchestheapplianceoffautomatically,
which impedes the combustion gases from entering the
compartment where the heater is installed. The control device
resets automatically after a cooling period.
If the appliance switches off during its use:
▶ Ventilate the compartment.
▶ After 10 minutes, operate the appliance again.
If it reoccurs, an authorized company should be contacted
Bosch.
DANGER: Explosion!
▶ Always close the gas shut-off valve before
proceeding with maintenance works in
parts that contain gas.
CAUTION: Water leakages can damage the
appliance.
▶ Always drain the system before proceeding
with works in the hydraulic part.
DANGER: Burns!
Water temperature increase.
▶ Check the setting of the gas regulator after
the appliance's maintenance works.
DANGER:
▶ In no case should the control device be
switched off, vitiated or replaced by a part
that is not indicated in the spare parts
catalog.
▶ The user should never touch the control
device.

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Maintenance (only by qualified technicians) | 17
Checking its operation:
To check the proper operation of the combustion gas control
device, proceed as follows:
▶Remove the combustion gas duct.
▶ Replace it with a duct (with approximately 50cm)
obstructed at the end.
▶ The duct should be placed vertically.
▶ Operating the appliance at nominal output and with the
water regulator set at maximum temperature.
In these conditions, the device should switch off after two
minutes maximum.
▶ Remove the duct and place the combustion gas duct again.

6 720 818 788 (2015/11)
18 | Problems
8 Problems
The installation, maintenance or repair should only be carried out by an authorized service BOSCH. The following table describes
the solutions for possible problems (solutions followed by * must only be carried out by an authorized service BOSCH).
Problem Cause Solution
The heater does not ignite.
Burner ignition slow and difficult.
Batteries are exhausted or installed
incorrectly, switch is switched off.
Gas shut-off valve closed.
Run out of gas.
Gas tube is obstructed.
Exhausted batteries.
Check position and replace batteries.
Open gas shut-off valve.
Replace cylinder.
Request a visit from an Authorized
Service Bosch.
Replace them.
Water doesn't warm up much. Gas with insufficient pressure.
Gas from cylinder running out (LPG).
Insufficient number of cylinders.
Check the position of the water regulator
and adjust according to the intended
water temperature.
Water doesn't warm up much, flame is too
low.
Insufficient gas supply. Check the regulator and if it is inadequate
or broken, replace it.
Check if the LPG cylinders freeze during
its operation, and if so, move them to a
less cold site or increase the gas battery
to suppress the consumption need of the
heater.
The burner extinguishes during the
appliance's use.
Temperature limiter worked.
Combustion gas control device worked.
After 10 minutes, operate the appliance
again.
Decrease the output on the gas regulator.
Check the outlet of the combustion gases.
Wait 10 minutes and switch the appliance
on again, if the problem persists, contact
an authorized technical service BOSCH.
Reduced water flow. Insufficient water supply pressure.
Obstructed taps or mixers.
Obstructed water valve.
Obstructed combustion chamber
(limestone).
Check and correct.
Check and clean.
Clean filter.
Clean and descale if necessary.*
Table 8

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Environmental protection | 19
9 Environmental protection
The environmental protection is one of the principles of the
group Bosch.
We develop and produce products that are safe,
environmentally friendly and economic.
Our products contribute for the improvement of the safety and
health conditions of people and for the reduction of
environmental impacts, including its posterior recycling and
elimination.
Packaging
All of the materials used in our packages are recyclable and
should be separated according to its nature and forwarded to
the proper collection systems.
We ensure the correct management and final destination of all
of the packaging waste, through the transfer of responsibilities
to the duly certified national managing entities.
End of the useful life of the appliances
Contact the local entities regarding the existing proper
collection systems.
All of the appliances contain reusable and recyclable materials.
The different components of the appliance are easy to
separate. This system allows the sorting of all of the
components for posterior reuse and recycling.

Bosch Thermotechnik GmbH
Junkersstrasse 20-24
D-73249 Wernau
www bosch-thermotechnology com