Bosch WR8/11 G Series User manual

Installation and Operating Instructions
Gas Instantaneous Water Heater
WR8/11 G...
6 720 607 845 (2015/05) EN
6720607845
Read installation manual prior to installation of this unit!
Read user manual before putting this unit in operation!
Observe the warnings in the manuals!
The installation room must fulfill the ventilation requirements!
Installation by an authorised person only!

6 720 607 845 (2015/05)
2 | Table of contents
Table of contents
1 Key to symbols and safety instructions . . . . . . . . . . 3
1.1 Key to symbols . . . . . . . . . . . . . . . . . . . . . . . 3
1.2 Safety Instructions . . . . . . . . . . . . . . . . . . . . 3
2 Technical Characteristics and Dimensions . . . . . . . 4
2.1 Category, Appliance type and Approval
number . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4
2.2 Explanation of Model Code . . . . . . . . . . . . . . 4
2.3 Accessories (Included with Appliance) . . . . 4
2.4 Description of the heater . . . . . . . . . . . . . . . 4
2.5 Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . 5
2.6 Electrical diagram . . . . . . . . . . . . . . . . . . . . . 6
2.7 Function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
2.8 Technical characteristics . . . . . . . . . . . . . . . 7
2.9 Product data on energy consumption . . . . . 8
3 Use . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
3.1 Before starting up the heater . . . . . . . . . . . . 9
3.2 Turning the heater on and off . . . . . . . . . . . . 9
3.3 Water flow . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
3.4 Power adjustment . . . . . . . . . . . . . . . . . . . . 10
3.5 Temperature/flow adjustment . . . . . . . . . . 10
3.6 Purge the appliance . . . . . . . . . . . . . . . . . . 10
4 Regulations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
5 Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
5.1 Important information . . . . . . . . . . . . . . . . . 11
5.2 Selection of the place of installation . . . . . 11
5.3 Heater mounting . . . . . . . . . . . . . . . . . . . . . 12
5.4 Water connection . . . . . . . . . . . . . . . . . . . . 12
5.5 Hydrogenerator operation . . . . . . . . . . . . . 12
5.6 Gas connection . . . . . . . . . . . . . . . . . . . . . . 12
5.7 Inlet/exhaust pipe installation . . . . . . . . . . 13
5.8 Startup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
6 Adjustments (must be carried out only by qualified
technicians) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
6.1 Factory regulations . . . . . . . . . . . . . . . . . . . 13
6.2 Conversion to a different type of gas . . . . . 13
7 Maintenance (must be carried out only by qualified
technicians) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
7.1 Periodic maintenance work . . . . . . . . . . . . 14
7.2 Startup after maintenance work . . . . . . . . 14
7.3 Flue gas safety device . . . . . . . . . . . . . . . . . 14
8 Problems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
9 Environment / disposal . . . . . . . . . . . . . . . . . . . . . . . 16

6 720 607 845 (2015/05)
Key to symbols and safety instructions | 3
1 Key to symbols and safety instructions
1.1 Key to symbols
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
Additional symbols
1.2 Safety Instructions
If there is a smell of gas:
▶ Close the gas valve.
▶ Open windows.
▶ Do not operate any electrical appliances or switches (on/
off).
▶Extinguishanynakedflames.
▶ Phone the gas company or an authorized technician from a
safe distance.
If there is a smell of burnt gases:
▶ Disconnect the appliance.
▶ Open doors and windows.
▶ Inform an installation company.
Fitting, modifications
▶ The fitting and modification of the installation of the
appliance must be carried out only by an authorized
technician.
▶ The pipes carrying burnt gases must not be modified.
▶ Do not close or reduce air circulation holes.
Maintenance
▶ We reccomend to have the system regularly serviced in
order to ensure that it functions reliably and safely.
▶ The installer is responsible for the safety and
environmental compatibility of the installation.
▶ The appliance should be serviced annually.
▶ Only original spare parts must be used.
Explosive and inflammable materials
▶ Inflammable materials (paper, solvents, ink, etc.) should
not be stored near the appliance.
Combustion air and ambient air
▶ To avoid corrosion, combustion air and ambient air should
be free of aggressive substances (for example halogenated
hydrocarbons containing chlorine and fluoride
composites).
Client information
▶ Inform the client about the function and operation of the
appliance.
▶ Caution clients against performing modifications or repairs
themselves.
Safety of electrical appliances for
domestic use and similar purposes
The following requirements apply in
accordance with EN 60335-1 in order to
prevent hazards from occurring when using
electrical appliances:
“This appliance can be used by children of8
years and older, as well as by people with
reduced physical, sensory or mental
capabilities or lacking in experience and
knowledge, if they are supervised and have
been given instruction in the safe use of the
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 Explanation
▶ Step in an action sequence
Cross-reference to another part of the document
•Listentry
– List entry (second level)
Table 1

6 720 607 845 (2015/05)
4 | Technical Characteristics and Dimensions
appliance and understand the resulting
dangers. Children must not play with the
appliance. Cleaning and user maintenance
must not be performed by children without
supervision.”
“If the power cable is damaged, it must be
replaced by the manufacturer, its customer
service department or a similarly qualified
person, so that risks are avoided.”
2 Technical Characteristics and
Dimensions
2.1 Category, Appliance type and Approval
number
2.2 Explanation of Model Code
[W] Gas Water Heater
[R] Proportional power adjustment
[8] Capacity (l/min)
[G] Electronic ignition powered Hydrodynamic generator
[31] Indicator number of LPG
[S...] Country code
2.3 Accessories (Included with Appliance)
• Gas water heater,
• Attachment elements,
• Installation accessories,
• Heater documentation.
2.4 Description of the heater
Operating convenience, as the heater is ready to operate by
simply pressing a switch.
• Heater for wall-mounting,
• Ignitionbyelectronicdevice triggeredwhenthe watervalve
opens,
• Great savings in comparison with conventional heaters,
due to the possibility of power adjustment and no
permanent pilot flame,
• Hydrodynamic generator produces the necessary
electrical power for ignition and appliance monitoring,
• Semi-permanent pilot burner which only functions during
the period between the opening of the water valve and the
ignition of the main burner,
• Heat exchanger in copper without tin/lead covering,
• Water valve in fibreglass-reinforced polyamide, 100%
recyclable,
• Automatic adjustment of the water flow by means of a
device which permits a constant flow to be maintained in
spite of variable pressure supplies,
• Gas flow adjustment proportional to the water flow to
maintain a constant high temperature.
•Safetydevices:
– Ionisation probe to check for accidental extinction of
the burner flame,
– Fluegas safetydevicewhichturnsoffthe heaterincase
of inadequate combusted gas evacuation conditions,
– Temperature limiter which prevents overheating of the
heat exchanger.
Model Category
WR8 G BE, CH, ES, FR, GB,
IT, PT, LU, HR
I3+
NL, DE I3B/P
WR11 G CH, ES, GB, IT, PT, HR II2H3+
LU II2E+3+
BE, FR I3+
NL II2L3B/P
DE II2L3B/P
BE I2E+
Type B11BS
Table 2
WR8G31 S....
WR11 G 31 S....
Table 3
0464 BQ 20

6 720 607 845 (2015/05)
Technical Characteristics and Dimensions | 5
2.5 Dimensions
Fig. 1
[1] Front cover
[2] Hole for fixing to wall
[3] Observation window
[4] Temperature control
[5] LED indicator Fault/ "Burner Out" indicator
[6] On/Off switch
[7] Output control
[8] Gas connection
[9] Flue socket
[10] Draught diverter with flue gas monitor
[11] Heat exchanger
[12] Automatic gas valve
[13] Igniter unit
[14] Water valve
[15] LED indicator for burner status
Dimensions (mm) A B C D E F G
H (Ø)
LPG
WR8B 310 580 228 112,5 463 60 25 3/4”
WR11B
Table 4 Dimensions

6 720 607 845 (2015/05)
6 | Technical Characteristics and Dimensions
2.6 Electrical diagram
Fig. 2 Electrical diagram
[1] Servo valve (normally open)
[2] Diaphragm valve
[3] Gas valve for pilote burner (normally closed)
[4] Ionisation detector
[5] Igniter electrode
[6] Flue gas safety device
[7] Temperature limiter
[8] Igniter unit
[9] LED indicator for failure
[10] LED indicator for burner status
[11] ON/OFF switch
[12] Hydrogenerator
2.7 Function
This gas heater is equipped with automatic electronic ignition
which simplifies its operation.
▶ To do so, just turn on the switch (Fig. 3).
After this procedure, automatic ignition occurs whenever a hot
water tap is opened. First, the pilot burner is lit and
approximately four seconds afterwards the main burner. The
pilot burner flame is then extinguished after a short period of
time.
This is a way of saving a great amount of energy as the pilot
burner only operates for the minimum necessary time to ignite
the main burner, in contrast to conventional systems which
operate permanently.
If this happens:
▶ Close and open the hot water tap to repeat the ignition
process until all the air has been purged.
Air in the gas supply pipe when the heater is
started up may cause ignition to fail.

6 720 607 845 (2015/05)
Technical Characteristics and Dimensions | 7
2.8 Technical characteristics
Technical characteristics Symbol Units WR8 WR11
Power and flow
Nominal useful power Pn kW 11,8 19,2
Minimum useful power Pmin kW 7 7
Useful power (adjustment range) kW 7 - 11,8 7 - 19,2
Nominal thermal flow Qn kW 13,5 21,8
Minimum thermal flow Qmin kW 8,1 8,1
Gas data1)
1) Hi 15 °C - 1013 mbar - dry: Natural gas 34.2 MJ/ m³ (9.5 kWh/ m³)
LPG: Butane 45.72 MJ/kg (12.7 kWh/kg) - Propane 46.44 MJ/kg (12.9 kWh/kg)
Supply pressure
LPG (butane/propane) G30/G31 mbar 28-30/37 28-30/37
Consumption
LPG (butane/propane) G30/G31 kg/h 1,0 1,6
Number of injectors 12 12
Water data
Maximum permissible pressure2)
2) Considering the water dilution effect this value must not be exceeded
pw bar 12 12
Temperature selector in fully clockwise position
Temperature rise °C 50 50
Flow range l/min 2 - 3,5 2 - 5,5
Minimum operating pressure pwmin bar 0,35 0,35
Minimum pressure for maximum flow bar 0,55 0,65
Temperature selector in fully anti-clockwise position
Temperature rise °C 25 25
Flow range l/min 4 - 7 4 - 11
Minimum operating pressure bar 0,45 0,45
Minimum pressure for maximum flow bar 1,0 1,0
Combustion products3)
3) For nominal calorific power.
Minimum low pressure mbar 0,015 0,015
Flow g/s 13 13
Temperature °C 170 170
Table 5

6 720 607 845 (2015/05)
8 | Technical Characteristics and Dimensions
2.9 Product data on energy consumption
The following product data complies with the requirements of EU Regulations 811/2013, 812/2013, 813/2013 and 814/2013
as supplement to the Directive 2010/30/EU.
Product data Symbol Unit 7701431589
Product type – – WR 8 G 31
Emissions of nitrogen oxides NOxmg/kWh 171
Sound power level, indoors LWA dB(A) 69
Declared load profile – –XS
Water heating energy efficiency class – –A
Water heating energy efficiency wh %75
Annual electricity consumption AEC kWh 0
Daily electricity consumption (average climate conditions) Qelec kWh 0
Annual fuel consumption AFC GJ 2
Daily fuel consumption Qfuel kWh 3,005
Smart control enabled? – –No
Thermostat temperature (factory setting) Tset °C –
Table 6 Product data on energy consumption

6 720 607 845 (2015/05)
Use | 9
3Use
3.1 Before starting up the heater
▶ Check if the gas indicated on the rating plate is the sameas
the one used at the location.
▶ Open the gas valve.
▶ Open the water valve.
3.2 Turning the heater on and off
Turning on
▶ Press the switch , position .
Fig. 3
Green light on = Main burner on
Fig. 4
Turning off
▶ Press the switch , position .
3.3 Water flow
If the red LED starts flashing, check the water pressure.
Fig. 5
Open all water and gas blocking devices.
Purge the pipes.
CAUTION:
The front panel in the burner and pilot burner
area may reach high temperatures, with risk of
burning in case of contact
CAUTION:
▶ Initial startup must be performed by a
qualified technician who will provide the
client with all the necessary information
for optimum operation of the gas heater.
6720680412-02.1av
6720680412-03.1av
6720607845-01.1V

6 720 607 845 (2015/05)
10 | Regulations
3.4 Power adjustment
Lower water temperature.
Less power.
Fig. 6
Higher water temperature.
More power.
Fig. 7
3.5 Temperature/flow adjustment
▶ Turn anti-clockwise
Increases flow and decreases water temperature.
Fig. 8
▶Turnclockwise.
Decreases flow and increases water temperature.
Regulating the temperature to the minimum required value
reduces energy consumption as well as the possibility of
limescale deposits in the heat exchanger.
3.6 Purge the appliance
If there is a risk of freezing, proceed as follows:
▶ Remove the retaining clip from threaded bushing (Fig. 9,
[1]).
▶ Remove threaded bushing (Fig. 9, [2]) from water valve.
▶ Empty the appliance of all water.
Fig. 9 Purge
[1] Retaining clip
[2] Threaded bushing
[3] Water valve
4Regulations
It is the law in GB that a competent Person in accordance with
the above regulations installs all gas appliances. Failure to
install appliances correctly could lead to prosecution. It is in
your interest , and that of safety, to ensure compliance with the
law.
Caravan & holiday homes:
the installation must meet the following standards Bs 5482:2
LPG and EN721 ventilation.
6720680033-02.1Av
2
1
3

6 720 607 845 (2015/05)
Installation | 11
5 Installation
5.1 Important information
▶ Before installing, call the gas company and check the
standard relating to gas heaters and ventilation
requirements for rooms.
▶ Install a gas cut-off valve as close as possible to the heater.
▶ After finishing the gas system, the pipes must be
thoroughly cleaned and leak-tested; to avoid damaging the
gas valve by excess pressure, this test must be performed
with the gas valve of the heater closed.
▶ Check if the heater corresponds to the type of gas
provided.
▶ Check if the flow and pressure through the installed
reducer are appropriate for the consumption of the heater
(see technical data in the table 5).
5.2 Selection of the place of installation
Requirements regarding the place of installation
• Do not install the heater in rooms with a volume of less than
8 m3(not including the volume of the furniture providing
this does not exceed 2 m3.
• Comply with the specific instructions for each country.
• Assemble the gas heater in a well-ventilated location where
it will not be exposed to temperatures below zero and in a
place where there is an evacuation pipe for combustion
gases.
• The gas heater must not be installed over a heat source.
• To avoid corrosion, the combustion air must be free from
harmful substances. Examples of particularly corrosive
substances: halogenated hydrocarbons contained in
solvents, paints, glues, engine gases and various domestic
detergents. If necessary, take adequate measures.
• Respect the minimum installation clearances indicated in
Fig. 10.
• The heater must not be installed in locations where the
room temperature can reach 0 °C.
In case of a frost risk:
▶ Turn off the heater.
▶ Purge the heater (see section 3.6).
Fig. 10 Minimum clearances
Combustion gases
• All gas heaters must be connected in a leak-roof manner to
a gas evacuation pipe of adequate dimensions.
•Thefluemust:
– be vertical (reduced horizontal sections or no
horizontal sections at all)
– be thermally insulated
– have an exit above the maximum roof level
• The combustion gases evacuation pipe must be inserted in
the flue ring. The external diameter of the pipe must be
slightly less than the diameter of the flue indicated in the
table of heater dimensions.
• The extremity of the evacuation pipe must be protected
against wind/rain.
DANGER: Explosion
▶ Always turn off the gas cock before
carrying out any work on components
which carry gas.
Installation, electrical connection, gas
installation, connection of inlet and exhaust
pipes and initial startup must be realized
exclusively by authorized personnel.
The appliance can only be sold in the countries
mentioned in the type plate.
The use of these heaters with water supply
pressure values below 0.5 bar is not
recommended.
L(m) h(cm)
0-1 3
1-2 6
2-3 9
3-4 24
6720607539-02.6Av
³30
3
h
L
³180
33
40
³100
£140

6 720 607 845 (2015/05)
12 | Installation
If these conditions cannot be met, a different location must be
selected for the gas intake and evacuation.
Surface temperature
The maximum surface temperature of the heater is less than 85
°C, with the exception of the combustion gases evacuation
device. No special protection measures are required for
flammable construction materials or built-in furniture items.
Air intake
The place where the heater is to be installed must have an area
of air supply according to the table.
The minimum requirements are listed above; however,
each country's specified requirements must also be
respected.
5.3 Heater mounting
▶ Remove the temperature/flow selector and the power
selector.
▶ Unscrew the front fixing screws.
▶ With a simultaneous movement towards you and upwards,
release the front of the two lugs from the back.
▶ Fix the heater vertically, using the provided screw hooks
and plugs.
5.4 Water connection
Itis advisableto purgethe installation beforehand,becausethe
presence of dirt may reduce the flow and, in extreme cases,
cause a blockage.
▶ Identifythe coldwater pipe(Fig. 11, [A])andthe hotwater
pipe (Fig. 11, [B]), so as to avoid any possible mis-
connection.
▶ Connect the water pipes to the water valve using the
provided connection accessories.
Fig. 11 Water connection
5.5 Hydrogenerator operation
The hydrogenerator (hydrodynamic generator) is inserted in
the water circuit between the water valve and the heat
exchanger. This component has a turbine that rotates when
water flows past its blades. This movement is transmitted to an
electric generator which powers the heater ignition unit.
The electrical voltage value supplied by the HDG is between
1,7VRMS and 2,2 VRMS AC. In this way, there is no need for
batteries.
5.6 Gas connection
CAUTION:
Ensure that the extremity of the evacuation
pipe is placed between the ledge and the ring
of the flue.
Heater Minimum useful area
WR8G 60 cm2
WR11G
Table 7 Useful areas for air intake
CAUTION:
Never support the gas heater on the water or
gas connections.
It is advisable to install a non-return valve on
the supply side of the heater to avoid problems
caused by sudden changes in supply pressure.
DANGER:
Iflocalregulationsarenot followexactly,afire
or explosion may result causing property
damage, personal injury or loss of life.
Only use accessories recommended in this
manual.

6 720 607 845 (2015/05)
Adjustments (must be carried out only by qualified technicians) | 13
Any local by-laws and regulations pertaining to installation and
use of gas-heated appliances must be observed.
Please refer to the laws that should be attended in your
country.
5.7 Inlet/exhaust pipe installation
Pipes should be installed according to the instructions in the
relevant manual.
▶ Once connected, the pipe should be inspected and the seal
guaranteed.
5.8 Startup
▶Openthewaterandgasflowvalves and check that all
connections are leak-tight.
▶ Check the flue gas safety device is functioning correctly,
proceed as explained in “ 7.3 Combustion gas probe”.
6 Adjustments (must be carriedoutonlyby
qualified technicians)
6.1 Factory regulations
Natural gas
Heaters designedfor Natural gas H(G20) are factorysealed for
delivery after the values on the characteristics panel have been
checked.
Liquid gas
Propane/butane heaters (G31/G30) are factory sealed for
delivery after the values on the characteristics panel have been
checked.
Power may be tuned according to the burner pressure process,
for which a manometer with U-shaped connecting tubes is
required.
6.2 Conversion to a different type of gas
Only use the original conversion kits.
The conversion must only be performed by a qualified
technician. The original conversion kits are supplied with
assembly instructions.
7 Maintenance (must be carried out only
by qualified technicians)
To ensure that gas consumption and the environmental load
(pollution, etc.) remain as negligible as possible over a longer
period of time, we recommend that you assure to have the
appliance maintained on an annual basis (inspection) or if
necessary (maintenance).
These jobs can only be done by a Bosch Technical Assistance
delegate.
▶ Only use original spare parts.
▶ Order the spare parts according to the spare parts
catalogue for the heater.
▶ Replace the joints and removed O-rings with new ones.
▶ Only the following lubricants must be used:
– Hydraulic part: Unisilikon L 641 (8 709 918 413)
– Threaded joints: HFt 1 v 5 (8 709 918 010).
DANGER: Make sure that all flue connections
are tighten sealed.
▶ Failure to follow this requirement may
cause dangerous exhaust gases to enter
living space which may result causing
personal injury or loss of life.
Sealed parts must not be interfered with.
Heaters should not be ignited when the
connectionspressureisless than1,7 kPamore
than 2,5 kPa.
Heaters should not be ignited when the
connections pressure is:
- Propane: less than 2,5 kPa more than 4,5 kPa.
- Butane: less than 2,0 mbar more than 3,5
kPa.
DANGER:
Explosion!
▶ Always turn off the gas cock before
carrying out any work on components
which carry gas.
CAUTION: Leaking water may damage the
appliance!
▶ Always empty the system before
disassembly of any hydraulic system part.

6 720 607 845 (2015/05)
14 | Maintenance (must be carried out only by qualified technicians)
7.1 Periodic maintenance work
Functional check
▶ Check the operation of all safety, adjustment and
monitoring elements.
Heat exchanger
▶ Check the heat exchanger is clean.
▶Incaseofdirt:
– Remove the heat exchanger and take out the limiter.
– Clean the chamber with a powerful jet of water.
▶ If dirt persists: Soak the plates in hot water with detergent
and clean thoroughly.
▶ If necessary: De-lime the interior of the heat exchanger and
the connection pipes.
▶ Install the heat exchanger using new joints.
▶ Install the limiter on the support.
Burner
▶ Check the burner annually and clean it if necessary.
▶ If it is very dirty (grease, soot): Remove the burner, soak it
in hot water with detergent and clean it thoroughly.
Water filter
▶ Replace the water filter installed in the water valve entry.
Burner and pilot injector
▶ Remove and clean the pilot burner.
▶ Remove and clean the pilot injector.
7.2 Startup after maintenance work
▶ Tighten all connections once more.
▶ Read chapter 3 “Use” and chapter 6 “Adjustments”.
7.3 Flue gas safety device
Operation and safety precautions
The flue gas safety device checks the effectiveness of flue gas
extractionbytheflue.Ifitis inadequate,theapplianceswitches
off automatically so that the combustion fumes do not escape
into the room in which the appliance has been installed. The
flue gas safety device resets after a cooling-down period.
If the appliance shuts down while in operation:
▶ ventilate the room.
▶ Wait about 10 minutes then restart the appliance.
If the problem recurs, call an engineer.
Maintenance
If faults occur on the flue gas safety device, proceed as follows:
▶ Undo flue gas safety device fixing screw.
▶ Loosen temperature limiters connectors.
▶ Undo magnetic unit connector.
▶ Remove thermocouple.
▶ Replace damaged component with new one and refit using
the reverse of the procedure set out in the table above.
Function check
Flue gas safety device function check:
▶ Disconnect flue pipe;
▶ Replace with pipe (about 50 cm long) with sealed end;
▶Fitpipevertically;
▶ Start up appliance at rated output and set temperature
control to maximum temperature;
Under those conditions, the appliance should shut down
after two minutes. Remove temporary pipe and reconnect
flue pipe.
WARNING:
Is forbidden to start up the appliance without
water filter correctly assembled.
DANGER:
The flue gas safety device must not under any
circumstances be switched off, simulated or
replaced by any other component.
DANGER:
The user must never make any modifications
to the flue gas safety device.

6 720 607 845 (2015/05)
Problems | 15
8Problems
Assembly, maintenance and repairs must be performed by qualified technicians only. The following chart offers solutions to
possible problems (solutions followed by an * must be undertaken by qualified technicians only).
Problem Cause Solution
The heater does not ignite.
Slow and difficult ignition of the burner.
Red LED flashes.
Switch turned off.
Reduced water flow.
Flat batteries.
▶ Check switch position.
▶ Check and correct.
▶ Replace batteries.
Water at low temperature. ▶ Check the temperature selector
position and adjust it according to the
desired water temperature.
Water is not heated, no flame. Insufficient gas supply. ▶ Check reducer, and if inadequate or
malfunctioning, replace it.
▶ Check if the bottles (butane) freeze
during operation, and if so, move
them to a warmer place.
The burner turns off the heater is
operating.
Temperature limiter has tripped.
Flue gas safety device has tripped.
▶ Wait 10 minutes and restart the
heater. If the problem persists, call a
qualified technician.
▶ Vent the area. Wait 10 minutes and
restart the heater. If the problem
persists, call a qualified technician.
Reduced water flow. Insufficient water supply pressure.
Dirty taps or mixers.
Gas valve blocked.
Heat exchanger blocked (limescale).
▶ Check and correct. *
▶ Check and clean.
▶Cleanfilter.*
▶ Clean and de-lime if necessary.*
Table 8

6 720 607 845 (2015/05)
16 | Environment / disposal
9 Environment / disposal
Environmental protection is a fundamental corporate strategy
of the Bosch Group.
The quality ofour products, their efficiency and environmental
safety are all of equal importance to us and all environmental
protection legislation and regulations are strictly observed.
We use the best possible technology and materials for
protecting the environment taking into account of economic
considerations.
Packaging
We participate in the recycling programmes of the countries in
which our products are sold to ensure optimum recycling.
All of our packaging materials are environmentally friendly and
can be recycled.
Used appliances
Used appliances contain valuable materials that should be
recycled.
The various assemblies can be easily dismantled and synthetic
materials aremarked accordingly. Assembliescan therefore be
sorted by composition and passed on for recycling or disposal.

6 720 607 845 (2015/05)
| 17
Notes

Bosch Thermotechnik GmbH
Sophienstrasse 30-32
D-35576 Wetz ar
www.bosch-thermotechno ogy.com

Bosch Thermotechnik GmbH
Sophienstrasse 30-32
D-35576 Wetz ar
www.bosch-thermotechno ogy.com

6 720 607 845 (2015/05)
| 17
Notizen