Bosch GREENSTAR HEATSLAVE II EXTERNAL 12/18 User manual

GREENSTAR HEATSLAVE II EXTERNAL
12/18, 18/25 & 25/32
FLOOR STANDING OIL FIRED CONDENSING BOILER
CONVENTIONAL FLUE & ROOM SEALED FLUE
FOR SEALED CENTRAL HEATING SYSTEMS WITH MAINS FED DOMESTIC
HOT WATER
THE BOILER IS FOR USE WITH
KEROSENE (28 SECOND OIL) ONLY
UK
USER INSTRUCTIONS & CUSTOMER CARE GUIDE

USER INSTRUCTIONS &
CUSTOMER CARE GUIDE
GREENSTAR HEATSLAVE II EXTERNAL 12/18, 18/25 & 25/32
6 720 805 212a (07.2013)
CONTACT INFORMATION
WORCESTER, BOSCH:
TECHNICAL: 0844 892 3366
SERVICE: 0844 892 3000
SERVICE (EIRE) 01494 0099
LITERATURE: 0844 892 9800
SALES: 01905 752640
WEBSITE: worcester-bosch.co.uk
NOTE: NO BOILER FAULT IS FOUND ON
OVER 30% OF ALL SERVICE CALL OUTS.
Please read the fault section of the manual
before contacting our service team.
USER INSTRUCTIONS &
CUSTOMER CARE GUIDE
PLEASE READ THESE
INSTRUCTIONS CAREFULLY BEFORE
OPERATING YOUR BOILER
THESE INSTRUCTIONS ARE
APPLICABLE TO THE WORCESTER,
BOSCH GROUP BOILER MODEL(S)
STATED ON THE FRONT COVER OF
THIS MANUAL ONLY AND MUST NOT
BE USED WITH ANY OTHER MAKE OR
MODEL OF BOILER.
THE INSTRUCTIONS APPLY IN
MAINLAND UK ONLY AND SHOULD
BE FOLLOWED EXCEPT FOR ANY
STATUTORY OBLIGATION.
IF YOU ARE IN ANY DOUBT CONTACT
THE WORCESTER, BOSCH GROUP
TECHNICAL SUPPORT.
THIS BOILER MUST BE INSTALLED BY
A OFTEC REGISTERED, COMPETENT
PERSON. FAILURE TO INSTALL
CORRECTLY COULD LEAD TO
PROSECUTION.
PLEASE LEAVE THIS GUIDE, THE
INSTALLATION INSTRUCTIONS AND
THE COMPLETED CHECKLIST WITH
THE USER.
NOTE: A CHECKLIST AND SERVICE
INTERVAL RECORD CAN BE FOUND
AT THE REAR OF THE INSTALLATION,
COMMISSIONING AND SERVICE
INSTRUCTIONS.
ABBREVIATIONS:
SEDBUK Seasonal Efficiency for Domestic
Boilers in the United Kingdom.
OFTEC Oil Firing Technical Association for the
Petroleum Industry.

CONTENTS
GREENSTAR HEATSLAVE II EXTERNAL 12/18, 18/25 & 25/32
6 720 805 212a (07.2013)
1
INTRODUCTION
USING YOUR
BOILER
GENERAL
INFORMATION MAINTENANCE
ENERGY
SAVING
GUARANTEENOTES
CONTENTS
INTRODUCTION
SAFETY PRECAUTIONS 2
USING YOUR BOILER
CONTROLS 3
OPERATING THE BOILER
Switching the boiler on/off 5
Setting the heating temperature 5
Controlling central heating 5
Setting the hot water temperature 6
Domestic hot water (DHW) 6
Eco mode 7
Frost protection 7
Boiler Alert state 8
System pressure & filling loop 9
Fault finding 10
MAINTENANCE
MAINTAINING YOUR BOILER 11
SERVICING 12
GENERAL INFORMATION
IMPORTANT INFORMATION 13
GENERAL NOTES 14
ENERGY SAVING
TIPS ON ENERGY SAVING 15
GUARANTEE
FAULT OR BREAKDOWN 16
YOUR GUARANTEE AND REGISTRATION 17
Dedicated to heating comfort
Thank you for purchasing a Greenstar oil fired condensing boiler from Worcester,
Bosch Group. The company prides itself on manufacturing boilers to the strictest
quality control standards throughout every stage of production.
Worcester, Bosch Group has led the field in innovative boiler design and
performance for more than 50 years. This heritage means all products are of
exceptional quality and proven reliability.
The condensing range in particular, is extremely energy efficient, converting more
of the fuel consumed into heat offering you economical running costs and value
for money. It sits in SEBUK band A, at the top of the energy rated boilers
available.
There is also the assurance of our no-nonsense parts and labour guarantee -
backed up by an optional servicing and maintenance contract to keep your boiler
operating at peak condition and efficiency.
To find out more about Worcester, Bosch Group, log onto
www.worcester-bosch.co.uk.

SAFETY PRECAUTIONS GREENSTAR HEATSLAVE II EXTERNAL 12/18, 18/25 & 25/32
6 720 805 212a (07.2013)
2
INTRODUCTION
SAFETY PRECAUTIONS
OIL FUMES OR LEAKS FROM THE BOILER:
✔Extinguish any naked flames.
✔Switch off the boiler electricity supply.
✔Isolate the fuel supply to the boiler.
✔Contact installer/service engineer.
IMPORTANT:
This boiler must only be operated by a responsible adult who has been instructed in,
understands and is aware of the boiler’s operating conditions and effects.
HEALTH & SAFETY:
The appliance contains no asbestos and no substances have been used in the construction
process that contravene the COSHH Regulations (Control of Substances Hazardous to Health
Regulations 1988). Where applicable, the CE mark indicates compliance with relative
EU Directives.
COMBUSTIBLE AND CORROSIVE MATERIALS:
Do not store or use any combustible materials (paper, thinners, paints etc.) inside or within the
vicinity of the boiler.
The combustion air must be kept clear of chemically aggressive substances which can corrode
the boiler and invalidate any warranty.
FITTING & MODIFICATIONS:
Fitting the boiler and any controls to the boiler may only be carried out by a competent
engineer in accordance with the relevant Installation Regulations.
Flue systems must not be modified in any way other than as described in the fitting instructions.
Any misuse or unauthorised modifications to the boiler, flue or associated components and
systems could invalidate the warranty. The manufacturer accepts no liability arising from any such
actions, excluding statutory rights.
This boiler is suitable for use with kerosene only, no other fuel may be used.
DO NOT OPERATE THE APPLIANCE WHEN:
The appliance, flue or system is incorrectly fitted, faulty or damaged.
The flue terminal outlet is obstructed or damaged.
There are fumes, fuel leaks or fuel smells from the fuel supply, appliance or internal flue system.
The system is empty, frozen or unpressurised (sealed systems).
The condensate pipe is blocked or restricted.
The appliance clearances are inadequate.
The air supply is restricted or vents damaged.

CONTROLS
GREENSTAR HEATSLAVE II EXTERNAL 12/18, 18/25 & 25/32
6 720 805 212a (07.2013)
TO ACCESS CONTROLS:
To access controls first remove the front panel:
4Unscrew the two screws (A) on the bottom
of the front panel using the tool (B) provided.
The panel will drop down and can be
carefully removed.
4Pull control drawer (C) fully forwards.
To r e p l a c e :
4Push control drawer (C) firmly back into place.
4Push the front panel up behind the top panel,
push in and secure in place with the screws (A)
using tool (B).
CONTROLS:
CONTROLS
USING YOUR
BOILER
3
A B C D E F G H I J K L M
N
A Spanner/return button
B Reset button
C ECO button
D Boiler LCD display
E Central heating temperature control
F Scroll up button
G OK - Select/confirmation button
H Scroll down button
I Demand/fault indicator (blue)
J Position for optional programmer
K Hot water temperature control
L Diagnostic port (service engineer)
M System pressure guage
N Burner service mode button (service engineer)
C
A
A
B

CONTROLS GREENSTAR HEATSLAVE II EXTERNAL 12/18, 18/25 & 25/32
6 720 805 212a (07.2013)
USING YOUR
BOILER
4
CONTROLS
DISPLAY SYMBOLS:
SCREEN DISPLAY DESCRIPTION EXPLANATION
All possible screen
symbols (including
greyed out symbols)
All possible screen symbols are
displayed briefly during start up. The
greyed out symbols are not required for
the operation of this appliance.
Numerical display Displays a temperature setting or boiler
status code.
Text display Displays ECO or Alert code
Hot water Displays during a hot water demand
and when the heat store is reheating.
Central heating Displays during central heating demand.
Alert Displays during a fault condition
with diagnostic and status code.
Service mode Displays when in the service menus.
Centigrade indication Displays next to temperature reading.
Confirmation Confirms a manual change.
Weather Compensation Displays only if Weather Compensation
sensor is fitted and is active.

OPERATING THE BOILER
GREENSTAR HEATSLAVE II EXTERNAL 12/18, 18/25 & 25/32
6 720 805 212a (07.2013)
5
USING YOUR
BOILER
OPERATING THE BOILER
SWITCHING THE BOILER ON/OFF:
4To switch on the boiler; turn on the water, oil and electricity supply to the boiler.
4Check the programmer/timer is correct and is set to ON.
4Set the room thermostat to the desired setting.
4Open and set thermostatic radiator valves as required.
4Turn the boiler water temperature control to the required setting.
4To switch off the boiler; turn the programmer/timer to OFF for heating and hot water.
SETTING CENTRAL HEATING TEMPERATURE:
1. Turn the central heating temperature control knob to the desired flow temperature between 50
and 82°C, this will be indicated on the digital display. This is not the room temperature but the flow
temperature through the radiators.
2. The radiator symbol will be displayed to confirm that the a central heating setting is being
changed.
3. The value is displayed during this process, press to exit or after five seconds of inactivity
the boiler display will return to the default screen.
CONTROLLING CENTRAL HEATING:
4Set the programmer/timer to the correct time with the required ON/OFF periods.
4Turn the room thermostat to the temperature required.
4Set thermostatic radiator valves to the required temperature for each room.
TURNING THE CENTRAL HEATING OFF DURING THE SUMMER:
4Turn your programmer/timer to the off position.
4Please refer to the programmer/timer manufacturer's instructions.

OPERATING THE BOILER GREENSTAR HEATSLAVE II EXTERNAL 12/18, 18/25 & 25/32
6 720 805 212a (07.2013)
USING YOUR
BOILER
6
CD
B
OPERATING THE BOILER
SETTING THE HOT WATER TEMPERATURE:
The hot water temperature control knob sets the temperature of the heat store. A high setting will
give a higher hot water temperature and greater quantities of hot water.
1. Turn the hot water temperature control knob to the desired level between 1 and 8, this will be
shown on the digital display.
2. The tap symbol will be displayed to confirm that the hot water setting is being changed.
3. The value is displayed during this process, press to exit or after five seconds of inactivity
the boiler display will return to the default screen.
DOMESTIC HOT WATER (DHW):
The GREENSTAR HEATSLAVE II is microprocessor controlled and at low DHW flow rates
(washing hands etc), the burner will not fire up when the tap is opened as the heat store will meet
the demand, but at high flow rates (filling a bath for example) the burner will fire up to boost the heat
store and meet the demand.
If DHW is OFF on the programmer, the appliance will still supply DHW using heat stored in the
tank, but it will not reheat the tank, therefore the amount of water available is limited but is adequate
for washing up, filling basins etc.
We recommend that DHW is timed off overnight and when the home is unoccupied to save energy.
The timer should be set for at least half an hour before normal hot water demands are expected to
reheat the heat store.
When reheating the heat store the controls will scavenge heat from the boiler for the tank, this
means that the pump will run (and the blue light will be on) for some time after the burner has
turned off whilst heat scavenging takes place.
WARNING: care should be taken when washing your hands as in some circumstances the
combination of low water flow rate and high setting of the hot water control thermostat can result in
very hot water at the tap at the start of the demand.

OPERATING THE BOILER
GREENSTAR HEATSLAVE II EXTERNAL 12/18, 18/25 & 25/32
6 720 805 212a (07.2013)
7
USING YOUR
BOILER
OPERATING THE BOILER
DOMESTIC HOT WATER ECO MODE:
Eco mode is an energy saving feature which alters the cycling function of the burner for heating the
heat store tank. In normal operation the burner will fire more frequently between demands in order to
maintain a stored temperature close to the hot water set point you have entered. In Eco mode, the
burner fires less frequently between demands meaning that the heat store temperature is maintained
at a lower average level, but the tank set point remains the same.
By selecting Eco mode you will be using less energy as the tank is allowed to cool a little more
before reheating to the set point.
SELECTING ECO MODE:
1. Press and hold for at least four seconds to enter the energy saving Eco mode, when Eco
mode is active, “Eco” will be displayed.
EXIT ECO MODE:
4To exit ECO mode, press and hold for at least four seconds, ‘Eco’ will disappear.
FROST PROTECTION:
4The boiler has built in frost protection to protect the boiler, the boiler must have power for this
to operate.
4If you are leaving the property unoccupied during cold weather, please leave your programmer
on constant and your room thermostat set to 15°C.
4If the temperature within the boiler falls below 8°C the pump will run to circulate water and
prevent the system freezing.
4If the temperature within the boiler falls below 4.5°C the boiler will fire immediately, bringing the
boiler temperature up to 12°C to avoid the possibility of the system freezing.
4This process will be repeated until such time that the boiler temperature does not drop below
4.5°C.
If there is no hot water or heating, check page 8 and 10 for fault condition guidance.

OPERATING THE BOILER GREENSTAR HEATSLAVE II EXTERNAL 12/18, 18/25 & 25/32
6 720 805 212a (07.2013)
USING YOUR
BOILER
8
OPERATING THE BOILER
BOILER ALERT STATE:
Should a fault develop with this boiler (or the system), the boiler will enter into a Locking or Blocking
condition. In the event of a Lockout condition, the blue operation/fault light and the alert triangle
symbol will flash, an alpha numeric fault code and a 3 digit cause code will be displayed.
BOILER RESET:
1. Press the button on the fascia to clear the fault.
4‘Reset’ and the spanner symbol are briefly displayed.
4If the reset was successful the boiler will return to normal operation.
4If the reset was not successful then the alert code will be displayed again, and the blue
operation/fault light will continue to flash.
Should the boiler enter into a Blocking condition, the boiler will stop operating and no fault
code will be displayed. In most cases the condition will clear automatically when the associated fault
clears e.g. waiting for an area to cool. In some cases a Blocking error has a defined time duration prior
to changing to a Locking condition.
If the fault remains and cannot be cleared by pressing the reset button, contact Worcester, Bosch
Group for assistance on 0844 892 3000.

9
USING YOUR
BOILER
OPERATING THE BOILER
SYSTEM PRESSURE:
This boiler is fitted to a sealed heating system which is pre-pressurised. Your installer will advise you
of the minimum and maximum pressure indicated on the pressure gauge.
4Check regularly that the pressure is maintained.
Optimum system pressure when your boiler is cold
(area A) and the pump is off. The indicated
pressure will change as the pump switches on, for
more accurate readings check pressure when the
pump is not running.
4Contact your installer or maintenance engineer if
a permanent significant decrease or increase in
pressure is indicated on the pressure gauge.
FILLING LOOP:
If the sealed system pressure within your system drops to below 0.5 bar (shown on the pressure
gauge) you will need to increase the pressure to ensure your boiler continues to run without
problems. Your installer should have informed you where to find the filling system and instructed
you in its use.
Once the external filling loop has been located, follow the instructions for re-pressurising the
system.
1. Unscrew blanking cap.
2. Attach the hose to the valves,
screw on hand-tight.
3. Turn the handle/screwdriver slot
through 90° to open valves.
4. The handle/screwdriver slot will
be in line with the valves.
5. When the pressure reaches
between the 1 and 1.5 bar marks
(zone A), turn the
handle/screwdriver slot back,
through 90°, to close the valve.
6. The handle/screwdriver slot will
be at 90° to the valves.
7. Remove the hose and replace
the blanking caps.

FAULT FINDING
10 FAULT FINDING GREENSTAR HEATSLAVE II EXTERNAL 12/18, 18/25 & 25/32
6 720 805 212a (07.2013)
MAINTENANCE
Problem Cause Remedy
Switch off boiler at master
switch, wait a few
seconds then switch on
again
Check setting
Check programmer
settings
Desired room temperature
is not reached
Thermostatic radiator
valve(s) set too low
Room thermostat set too Increase room thermostat
low setting
Temperature control for
CH flow on boiler set too
low
Air trapped in heating
system
Desired room temperature
exceeded by large amount
Temperature rises instead
of falling
No display or display unit
does not respond
Hot water temperature too
low
Radiators are too hot
Clock is incorrectly set
Momentary power failure
Hot water temperature set
too low
Hot water not in timed
period on the programmer
Increase thermostatic
radiator valve setting(s)
Increase CH flow
temperature control
setting
Turn down thermostatic
radiator valves / room stat
Check setting
Bleed radiators and
recharge heating system
if system pressure is low

MAINTAINING YOUR BOILER
Your new boiler represents a long term investment in a reliable, high quality product.
In order to realise its maximum working life and to ensure it continues to operate at peak
efficiency and performance, it is essential that servicing and maintenance checks are performed at
least once a year by an OFTEC engineer or other suitably qualified person.
If you would like to know more about servicing options from Worcester, Bosch Group, please visit
worcester-bosch.co.uk. Please tick the appropriate box on your warranty registration card for
further details of the Worcester, Bosch Group Service Contract .
When your boiler requires servicing please contact a Worcester, Bosch Group contact centre
(see inside front cover for details).
In addition to the service contract we are pleased to offer a one-off annual service or breakdown
call out for your boiler.
Maintenance tips:
Regularly check the oil level in the tank.
Do not obstruct the flue outlet or the air inlet.
USE IN HARD WATER AREAS:
In exceptionally hard water areas a device to prevent scale formation may be fitted. Installation of
a scale inhibitor assembly should be in accordance with the requirements of the local water
company. An isolating valve should be fitted to allow for servicing.
MAINTAINING YOUR BOILER
GREENSTAR HEATSLAVE II EXTERNAL 12/18, 18/25 & 25/32
6 720 805 212a (07.2013)
11
MAINTENANCE

SERVICING
SERVICING:
You must have the boiler regularly serviced by a competent, qualified OFTEC registered
engineer using approved spares, to help maintain the economy, safety and reliability of the
boiler.
The boiler should be serviced once each year after installation unless the installation
conditions and usage demand more frequent services.
IMPORTANT:- Ensure that the service engineer completes the Service Record in
the checklist after each service.
The completed checklist will be required in the event of any warranty work
and may be required by the local Building Control Inspector.
NOTE: The checklist and service interval record can be found at the rear of the
Installation, Commissioning and Servicing Instructions.
12 SERVICING GREENSTAR HEATSLAVE II EXTERNAL 12/18, 18/25 & 25/32
6 720 805 212a (07.2013)
MAINTENANCE

IMPORTANT INFORMATION
GREENSTAR HEATSLAVE II EXTERNAL 12/18, 18/25 & 25/32
6 720 805 212a (07.2013)
13
GENERAL
INFORMATION
IMPORTANT INFORMATION
WARNING:
External equipment operating at 230 Volts
must not be serviced or repaired during
adverse weather conditions.
Do not use pressure washers or steam
cleaners on this appliance or cabinet.
FUEL:
This appliance is designed to use 28 second
kerosene, no other fuel must be used.
BOILER LOCATION:
WARNING:
This boiler must not be installed where there
is a potential for excessive ground water
coverage.
To prevent “wetting” it is recommended that the
flue terminal faces away from walls.
Never allow the flue terminal or air inlet to
become obstructed by plants or any other
objects.
This boiler is only suitable for installing externally
at a suitable location onto a fixed, permanent,
rigid surface capable of supporting the boiler
weight. Wood and tarmac hardstandings are not
recommended.
The boiler must be installed on a flat level
surface to ensure that condensate does not
enter the primary heat exchanger.
The cabinet is not load bearing, and only
provides weather protection for the boiler inside.
There must be sufficient hard standing and
access around the boiler for servicing.
INSTALLATION & SERVICING
CLEARANCES
FRONT
FRONT
FRONT
BASE
Plan
view
Plan
view
2500mm
2500mm
2500mm
600mm
600mm
600mm
600mm
50mm
10mm
85mm 45mm
The same applies
for right hand flue
installation where
right and left
clearances are
mirrored.

GENERAL NOTES
14 GREENSTAR HEATSLAVE II EXTERNAL 12/18, 18/25 & 25/32
6 720 805 212a (07.2013)
GENERAL
INFORMATION
GENERAL NOTES
To get the best from your boiler. please read these instructions carefully.
CENTRAL HEATING SYSTEMS
During the first few hours of operation of the central heating system, check that all radiators are
being heated at an even rate. If the top of a radiator is at a lower temperature than the bottom then it
should be vented by releasing air through the venting screw at the top of the radiator. Ask your
installer to show you how this is done. Repeated venting will reduce the quantity of water in the
system and this must be replenished for safe and satisfactory operation of the boiler.
When excessive venting or water leaks are found in the system you must contact a service engineer
to inspect the installation and rectify any fault.
Only use additives compatible with the boiler and system. Use of incompatible additives can cause
damage and will invalidate the boiler guarantee.
CONDENSATE DRAIN
This is a condensing boiler and the terminal will, at times give out a plume of water vapour. This is
quite normal.
The boiler also produces quantities of condensate which is discharged regularly via a pipe to drain.
This pipe must not be blocked or altered in any way.
CLEARANCES - SERVICE
Your installer will have provided adequate space around the boiler for safety and servicing access.
Do not restrict this space with the addition of cupboards, shelves etc. next to the boiler.
ROOM THERMOSTAT
A room temperature controller must be fitted to control the central heating. Refer to instructions
supplied with the thermostat for information on siting and setting.
TH ERMOSTATIC RADIATOR VALVE S
It is recommended that this type of valve is fitted to all but one of the radiators (or at least those in
the sleeping accommodation). The remaining radiator, which must be where the room thermostat is
located, should be un-controlled and must be left open.

TIPS ON ENERGY SAVING
GREENSTAR HEATSLAVE II EXTERNAL 12/18, 18/25 & 25/32
6 720 805 212a (07.2013)
15
ENERGY
SAVING
TIPS ON ENERGY SAVING
Room thermostats:
Reducing the setting of the room thermostat by 1°C can reduce fuel consumption by up to 10%.
New control systems:
Upgrade your heating control system with the latest equipment available. The minimum level of control
for a heating system is a programmer, interlocking room thermostat and thermostatic radiator valves.
Radiators:
More often than not radiators will be sited underneath a window, so the warm air from the radiator
heats the colder incoming air from the window.
The performance of the radiator will be affected if the curtains are allowed to drape over the radiator or
shelves are fitted above it.
The positioning of furniture and tables in front of the radiator should also be avoided.
It is advisable to manually adjust all radiator valves every 2-3 months to prevent them from sticking. It is
also important that the plastic tops of all valves are always in position and not cracked or damaged to
help prevent accidents. Care should be taken when vacuum cleaning carpets to avoid damage to
valves and pipework.
The heating system and the outputs of the radiators have been carefully selected by your installer. The
temperature obtainable in any given room is dependent on all radiators being operated at the same
time. If you decide to turn off radiators in unused rooms, spare bedrooms etc., you may experience
slightly lower room temperatures in rooms adjacent to unheated rooms.
Heating economically:
The boiler is designed to provide a high level of comfort while keeping oil consumption and the
resulting environmental effect as low as possible.
The central heating control on the boiler should be set as low as possible while still maintaining a
comfortable room temperature.
The temperature of each room can be set individually using the thermostatic radiator valves (except the
primary room with the room thermostat).
Roof insulation:
Around 30% of the heat loss from a property is through the roof. Replace any old insulation with new
insulation, preferably to a minimum thickness of 200mm.
Window frames:
Single glazed windows, particularly those with steel frames, can lose a great deal of heat.
Consideration should be given to replacement with PVCu or wooden framed double glazed units.
Curtains:
Lined curtains, or heavier full length curtains can provide excellent insulation. However, always ensure
that the curtains do not drape over radiators.
Draughts:
Try to ensure that draughts around doors, windows, letterboxes and keyholes etc., are reduced by
using a suitable draught excluder.
Warning: Do not block or seal any air vents that are installed to ensure
the central heating boiler (or other appliance) operate safely.

13
16
GUARANTEE
BOILER DATA LABEL
The data label can be found on the inside of the
right hand side panel.
To access first remove the front panel:
4Unscrew the two screws (A) on the bottom
of the front panel using the tool (B)
provided.
The panel will drop down and can be
carefully removed.
To replace:
4Push the front panel up behind the top
panel, push in and secure in place with the
screws (A) using tool (B).
(You can record this information on the inside
back cover of this manual.)
FAULT OR BREAKDOWN
This boiler is supported in mainland UK by
Worcester, Bosch Group, part of Bosch
Thermotechnology Ltd.
Specialist trained, Worcester, Bosch Group Service
Engineers are available to attend in the unlikely event
that a breakdown occurs on this boiler.
No charge will be made for parts and/or
labour providing:
4A boiler fault is found and the boiler has
been installed within the guarantee period.
Reasonable evidence of this must be
supplied on request
A call-out charge will be made where:
4The boiler has been installed for longer than
the guarantee period. OR
4Our Field Service Engineer finds no fault
with the boiler (see Note). OR
4Evidence cannot be provided that the first
year service inspection has been carried out.
(i.e. an entry in the service interval record
found at the rear of the boiler installation
and servicing manual). OR
4The cause of breakdown is misuse or with
other parts of your plumbing/heating system,
or with equipment not supplied by Bosch
Thermotechnology Ltd.
NOTE: NO BOILER FAULT IS FOUND ON
OVER 30% OF ALL SERVICE CALL OUTS.
Please read this guide carefully to gain a good
understanding of the operation of your boiler. In
the case of a suspected fault, refer to the fault
finding section of this guide.
If in doubt contact our Technical Support
In the event of an boiler fault or breakdown
please contact our Service Department. Your
service administrator will arrange for an Engineer
to call with the minimum of delay. Under normal
circumstances this will be from 1 to 3 working
days (excluding weekends) for priority
breakdown situations (no hot water and/or
heating).
Invoices for attendance and repair work carried
out on this boiler by any third party will not be
accepted.
DATA LABEL
A
A
B
FAULT OR BREAKDOWN GREENSTAR HEATSLAVE II EXTERNAL 12/18, 18/25 & 25/32
6 720 805 212a (07.2013)

Model
Serial No.
(See identity label inside boiler casing)
Type / size
Date of installation
Installer details
GUARANTEE REGISTRATION
You should complete and return the postpaid
Guarantee Registration Card within 30 days of
installation.
Returning your card will register you as the
owner of your new boiler and will assist us in
maintaining an effective and efficient customer
service by establishing a reference and
permanent record for your boiler.
This does not affect your statutory rights.
For your own record:
YOUR GUARANTEE
This boiler is guaranteed against faulty materials
or workmanship for a period of 24 calendar
months (60 months for the primary heat
exchanger) from the date of installation subject
to the following conditions:
4That during the period of this guarantee any
components of the unit which are proved to
be faulty or defective in manufacture will be
exchanged or repaired free of material
charges and free of labour charges if
repaired directly by
Bosch Thermotechnology
Ltd. Please be aware that invoices
for attendance and repair of this
boiler by third parties will not be
accepted for payment by Bosch
Thermotechnology Ltd.
4That the householder may be asked to
prove, when requested, the date of
installation, that the boiler was correctly
commissioned and, where appropriate, that
the 12 month service inspection has been
carried out to the satisfaction of Bosch
Thermotechnology Ltd, when requested.
The guarantee card must then be returned
within 30 days of installation.
4That any product or part thereof returned for
servicing under the guarantee must be
accompanied by a claim stating the Model,
Serial Number and Date of Installation.
4That Bosch Thermotechnology Ltd will not
accept responsibility for damage caused by
faulty installation, neglect, misuse or
accidental damage and non-observance of
the instructions contained in the Installation
and Users Instructions leaflets.
4That the boiler has been used only for
normal domestic purposes, for which it was
designed.
4This guarantee applies only to equipment
purchased and installed in mainland UK.
This guarantee is given in addition to all your
normal statutory rights.
Worcester, Bosch Group is a brand name of
Bosch Thermotechnology Ltd.
17
GUARANTEE REGISTRATION
YOUR GUARANTEE
GREENSTAR HEATSLAVE II EXTERNAL 12/18, 18/25 & 25/32
6 720 805 212a (07.2013)
GUARANTEE

Dedicated to heating comfort
Worcester, Bosch Group
Cotswold Way, Warndon, Worcester WR4 9SW.
Tel. [phone] Fax. [phone]
worcester-bosch.co.uk
Worcester, Bosch Group is a brand name of Bosch Thermotechnology Ltd.
6 720 805 212a (07.2013)
If the boiler fails to give
complete satisfaction,
please check the following
before calling for a service
engineer:-
General checks
1. Oil level in the tank
2. Power to the boiler
3. All control settings
NOTE: NO BOILER FAULT IS FOUND ON
OVER 30% OF ALL SERVICE CALL OUTS.
Please read the fault section of the manual before con-
tacting our service team.