Worcester Greenstar Heatslave 12/18kW User manual

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

USER INSTRUCTIONS &
CUSTOMER CARE GUIDE
GREENSTAR HEATSLAVE 12/18 - 18/25 - 25/32
8 716 106 253c (11.07)
CONTACT INFORMATION
Worcester, Bosch Group:
Service call centres:
UK TEL: [phone]
FAX: [phone]
SCOTLAND ONLY FAX: [phone]
Other enquiries: TEL: FAX:
MAIN RECEPTION: 01905 754624 754619
TECHNICAL: 08705 266241
LITERATURE: 01905 752556
SALES: 01905 752640
WEBSITE: www.worcester-bosch.co.uk
WATER TREATMENT:
FERNOX 01799 550811
www.fernox.com
SENTINEL 0151 420 9595
www.betzdearborn.com/sentinel
FLUE TERMINAL GUARDS:
WORCESTER, BOSCH GROUP
OIL FIRING TECHNICAL ASSOCIATION:
OFTEC 0845 6585080
www.oftec.org
USER INSTRUCTIONS &
CUSTOMER CARE GUIDE
PLEASE READ THESE INSTRUCTIONS
CAREFULLY BEFORE OPERATING YOUR
APPLIANCE.
THESE INSTRUCTIONS ARE APPLICABLE
TO THE WORCESTER, BOSCH GROUP
APPLIANCE MODEL(S) STATED ON THE
FRONT COVER OF THIS MANUAL ONLY AND
MUST NOT BE USED WITH ANY OTHER
MAKE OR MODEL OF APPLIANCE.
IF YOU ARE IN ANY DOUBT CONTACT THE
WORCESTER, BOSCH GROUP TECHNICAL
HELPLINE.
PLEASE KEEP THESE INSTRUCTIONS WITH
THE INSTALLATION AND SERVICING
INSTRUCTIONS IN A SAFE PLACE OR WITH
THE APPLIANCE AFTER INSTALLATION OR
SERVICING.
DO NOT INTERFERE WITH ANY SEALED
COMPONENTS.
ABBREVIATIONS:
SEDBUK Seasonal Efficiency for Domestic
Boilers in the United Kingdom.
OFTEC Oil Firing Technical Association for the
Petroleum Industry.

CONTENTS
GREENSTAR HEATSLAVE 12/18 - 18/25 - 25/32
8 716 106 253c (11.07)
1
CONTENTS
INTRODUCTION
SAFETY PRECAUTIONS 2
EXCELLENCE COMES AS STANDARD 3
GENERAL INFORMATION 4-6
USING YOUR APPLIANCE
CONTROLS 7
OPERATING THE APPLIANCE
Switching the boiler on/off 8
Setting the heating temperature 8
Controlling central heating 8
Setting the hot water temperature 9
Frost protection 9
Pressure gauge 10
Filling loop 11
Fault conditions 12/18 and 18/25 models 12
Fault conditions 25/32 model 13
ENERGY SAVING
TIPS ON ENERGY SAVING 14-15
MAINTENANCE
MAINTAINING YOUR APPLIANCE 16
FAULT FINDING 17
FAULT OR BREAKDOWN 18
GUARANTEE
YOUR GUARANTEE 19
GUARANTEE REGISTRATION 20
INTRODUCTION
USING YOUR
APPLIANCE
MAINTENANCE ENERGY
SAVING
GUARANTEE
NOTES

EXCELLENCE COMES AS STANDARD GREENSTAR HEATSLAVE 12/18 - 18/25 - 25/32
8 716 106 253c (11.07)
2
SAFETY PRECAUTIONS
FITTING & MODIFICATIONS:
Fitting the appliance and any controls to the
appliance 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 appliance, flue or associated
components and systems could invalidate
the warranty. The manufacturer accepts no
liability arising from any such actions,
excluding statutory rights.
SERVICING:
You must have the system regularly
serviced by a competent, qualified OFTEC
registered engineer using approved spares,
to help maintain the economy, safety and
reliability of the appliance.
The appliance should be serviced once each
year after installation unless the installation
conditions and usage demand more frequent
services.
DO NOT OPERATE THE APPLIANCE WHEN:
The appliance, flue or system is incorrectly
fitted, faulty or damaged.
The flue terminal outlet fitted on the outside
wall or roof is obstructed or damaged.
There are fumes, fuel leaks or fuel smells
from the fuel supply, appliance or 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.
INTRODUCTION
OIL SMELLS, LEAKS OR FUMES FROM THE
APPLIANCE:
Extinguish any naked flames.
Open windows and doors.
Switch off the appliance electricity supply.
Isolate the fuel supply to the boiler.
Contact installer/service engineer.
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 appliance.
The combustion air must be kept clear of
chemically aggressive substances which can
corrode the appliance and invalidate any
warranty.

EXCELLENCE COMES AS STANDARD
GREENSTAR HEATSLAVE 12/18 - 18/25 - 25/32
8 716 106 253c (11.07)
3
INTRODUCTION
EXCELLENCE COMES AS
STANDARD
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 appliance design and performance for
more than 40 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
appliances 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, use the 'Contact Information' shown on
the inside front cover.

GENERAL INFORMATION
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.
THERMOSTATIC RADIATOR VALVES:
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.
SHOWERS, BIDETS, TAPS/MIXING VALVES:
Standard hot and cold taps and mixing valves
must be suitable for operating at the water mains
supply pressure. Only thermostatically controlled
showers are suitable for use with this appliance.
Hot and cold mains fed water can be supplied
directly to an over-rim flushing bidet subject to
local water company requirements.
WATER FLOW:
With all mains fed systems the flow of water
from individual taps will vary with the number of
outlets operated simultaneously and the cold
water supply pressure to the property. Flow
balancing using 'ball-o-fix' type valves is
recommended to avoid an excessive reduction in
flow to individual outlets.
The flow of water demanded from both hot and
cold service outlets is dependent on the mains
water supply, it may not be possible in some
installations to operate all outlets simultaneously.
MAINS WATER FAILURE:
Central heating:
The appliance will operate in central heating mode.
Hot water will not be available until the water
supply is restored.
GENERAL INFORMATION GREENSTAR HEATSLAVE 12/18 - 18/25 - 25/32
8 716 106 253c (11.07)
4
INTRODUCTION
Read these instructions carefully to get the best
from your appliance.
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 appliance.
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 appliance
and system. Use of incompatible additives can
cause damage and will invalidate the appliance
guarantee.
Sealed heating systems:
Where the appliance is fitted to a sealed heating
system your installer will inform you of the
minimum and maximum pressure which must be
indicated on the pressure gauge.
Regularly check the pressure is maintained and
contact your installer or maintenance engineer if
there is a noticeable, permanent drop in
pressure. If the system loses pressure it should
be repressurised and the cause of the loss
investigated.
CONDENSATE:
This is a high efficiency appliance using
condensing technology which will under normal
operation produce a regular discharge of
condensate to drain and at times, give out a
plume of water vapour from the flue terminal.

GENERAL INFORMATION
GREENSTAR HEATSLAVE 12/18 - 18/25 - 25/32
8 716 106 253c (11.07)
5
INTRODUCTION
GENERAL INFORMATION
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.
CIRCULATING PUMP:
The pump is pre-set and must not be adjusted.
BOILER LOCATION:
This boiler is only suitable for installing internally
within a property at a suitable location onto a
fixed rigid non-combustible surface at least the
same size as the boiler and capable of
supporting the boiler weight.
Roof space installations must fully conform to
BS 5410 part 1 section 4.6.9.
**The boiler can be installed under a worktop as
long as:
The worktop above the boiler is removable
for maintenance.
There is at least 10mm clearance above the
boiler.
The front of the boiler is not enclosed.
The boiler is not suitable for external installation
unless a suitable enclosure is provided.
VENTILATION:
Air vents must be functional at all times and the
air supply must not be restricted or
contaminated.
The appliance clearances must meet the
minimum shown opposite for servicing and
venting purposes.
* If this clearance is less than 75mm the flue
'knock-out' panel sections must be removed to
improve air circulation and cooling.
Do not place clothes or objects to hinder the air
circulation required by the appliance.
SERVICE CLEARANCES
600mm
300mm**
5mm*
5mm*
530mm
1200mm
1155mm

GENERAL INFORMATION GREENSTAR HEATSLAVE 12/18 - 18/25 - 25/32
8 716 106 253c (11.07)
6
GENERAL INFORMATION
Conventional flue appliances require an
adequate supply of fresh air which must be
delivered to the boiler for combustion purposes
through a permanent inlet, such as an air brick,
into the area where the boiler is situated.
If a cupboard or compartment which is to be
used for storage or airing is built around the
appliance after installation there must be a
non-combustible partition around the boiler.
Further information can be found in BS 5410
which also describes venting requirements.
Venting compartments:
Ventilation must be provided for boilers fitted
into compartments as described in BS 5410
A minimum of 2 air vents must be fitted, one
at low level and another at high level onto
the same wall using the same air for
circulation.
Combustion air must not be taken from a
room or internal space containing a bath or
shower and must not communicate with a
protected area such as a hall, stairway,
landing, corridor, lobby, shaft etc.
Air vents must allow access for clean free air
and must be sited to comply with the flue
terminal position requirements.
Air ducting runs must not exceed 3m.
Low level air vents must be less than
450mm from the floor.
A warning label must be added to the vents
with a statement to the effect: ''Do not block
this vent. Do not use for storage''.
Conventional flued appliances:
Minimum area of of air inlet for combustion:
kW Area (cm2)
12/18 99
18/25 138
25/32 176
MINIMUM AIR VENT AREA (cm2) FOR
APPLIANCES INSTALLED IN A COMPARTMENT:
1Internal air to and from a space/room inside the building.
2External air to and from directly outside the building.
Conventional flue:
Room Sealed flue:
kW
12/18
18/25
25/32
kW
12/18
18/25
25/32
Internal1ventilation External2 ventilation
High
Level
Low
Level
High
Level
Low
Level
Internal1ventilation External2 ventilation
High
Level
Low
Level
High
Level
Low
Level
198 279 99 198
275 413 138 275
352 528 176 352
198 198 99 99
275 275 138 138
352 352 176 176
INTRODUCTION

CONTROLS
GREENSTAR HEATSLAVE 12/18 - 18/25 - 25/32
8 716 106 253c (11.07)
A Hot water temperature control.
B Central heating temperature control.
C Lock-out indicator.
D Power on indicator.
E Heating system water pressure gauge.
F Optional programmer (see instructions
supplied with programmer for details).
G Reset button - lock-out (behind front
panel)* for 12/18 and 18/25 models only.
*On the 25/32 model the reset is
accessed by removing the top panel on
the appliance and pressing the reset
button on the control box of the burner
(see diagram below).
H Reset button - flue thermostat (behind
front panel).
J Reset button - heating (behind front
panel).
K Holder for User Guide.
L Front panel.
Lockout reset button locations
25/32 Model
Remove top panel to access Burner
Reset Button (A).
12/18 and 18/25 Models
Remove front panel (pull bottom of
panel out and lift to remove) to
access Burner Reset Button (A)
Thermostat Reset Buttons (B and
C) are common to all models.
CONTROLS
USING YOUR
APPLIANCE
OFF
TIMED
ONCE
ON
OFF
TIMED
ONCE
ON
HOT WATER CENTRAL HEATING
ADVANCE SET ? ADVANCE
SELECT SELECTYES
DCEF
AB
GHJK L
bar
7

OPERATING THE APPLIANCE GREENSTAR HEATSLAVE 12/18 - 18/25 - 25/32
8 716 106 253c (11.07)
USING YOUR
APPLIANCE
OPERATING THE APPLIANCE
SWITCHING THE BOILER ON/OFF:
To switch on the boiler; turn on the water,
oil and electricity supply to the boiler.
Check the programmer/timer is correct and
it is set to ON.
Set the room thermostat to the desired
setting.
Open and set thermostatic radiator valves as
required.
Turn the boiler water temperature control to
the required setting.
To switch off the boiler; turn the
programmer/timer to OFF for heating and
hot water. If the appliance is left unused and
exposed to freezing conditions; shut off all
the mains supplies, isolate the boiler and
drain the system and boiler.
SETTING HEATING TEMPERATURE:
Turn the control clockwise to increase the
water temperature.
Turn the control anti-clockwise to reduce the
water temperature.
The minimum and maximum ranges of the
heating control positions are approx. 55°C to
81°C.
CONTROLLING CENTRAL HEATING:
Set the programmer/timer to the correct time
with the required ON/OFF periods.
Turn the room thermostat to the temperature
required.
Set thermostatic radiator valves to the
required temperature for each room.
CENTRAL HEATING TEMPERATURE CONTROL:
8

OPERATING THE APPLIANCE
GREENSTAR HEATSLAVE 12/18 - 18/25 - 25/32
8 716 106 253c (11.07)
9
OPERATING THE APPLIANCE
SETTING THE HOT WATER TEMPERATURE:
Turn the control clockwise to increase the
water temperature.
Turn the control anti-clockwise to reduce the
water temperature.
A high setting will give a higher hot water
temperature and greater quantities of hot water.
WARNING: care should be taken when
washing your hands as 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.
FROST PROTECTION:
A frost thermostat can be wired into the
appliance.
Frost protection should be fitted to the
system where the system is most exposed
and at risk of freezing.
HOT WATER TEMPERATURE CONTROL:
USING YOUR
APPLIANCE

OPERATING THE APPLIANCE GREENSTAR HEATSLAVE 12/18 - 18/25 - 25/32
8 716 106 253c (11.07)
USING YOUR
APPLIANCE
10
OPERATING THE APPLIANCE
PRESSURE GAUGE:
The pressure gauge indicates the boiler/heating
system water pressure and has two pointers:
Red (external) pointer is set manually to indicate
the normal system pressure (1 to 1.5 bar for
sealed systems, 0 to 0.5 bar for open vent
systems).
Grey (internal) pointer shows the actual system
pressure (on sealed systems the pressure will
rise when the boiler/system heats up from cold).
Please check with your installer what type of
system you have.
On sealed systems the red pointer should be set
to the normal operating pressure (1 to 1.5 bar)
and the grey ponter will fluctuate around this
pressure depending on whether the system is
hot or cold. If a sealed system pressure drops
below 1 bar the system should be repressurised
to between 1 and 1.5 bar and the cause of the
drop investigated. If the pressure rises to more
than 2.5 bar please contact your installer for
advice.
Regularly check that the pressure is maintained
and contact your installer or maintenance
engineer if a permanent significant drop in
pressure occurs.
On open vent systems the pressure gauge is not
used and the grey needle will remain at the
bottom of its scale. If the presure rises to more
than 1 bar please contact your installer for
advice.
bar
0
1
2
3
4
Sealed System pressure when
boiler is operating CH

OPERATING THE APPLIANCE
GREENSTAR HEATSLAVE 12/18 - 18/25 - 25/32
8 716 106 253c (11.07)
11
USING YOUR
APPLIANCE
OPERATING THE APPLIANCE
FILLING LOOP: Sealed systems only
A filling loop is a set of manually operated valves
and a flexible pipe that allow water to be added
to the system when the valves are opened. This
device must be WRAS approved. To comply with
local water authority by-laws the flexible pipe
should only be connected when topping up the
system and disconnected when not in use.
Should the sealed system pressure within your
system have dropped to below 0.5 bar (shown
on the pressure gauge) you will need to increase
this 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.
Should this have been overlooked you can
increase the pressure by following these
instructions:
1. The boilers integral pressure gauge should be
visible from the filling link.
2. Connect the flexible hose across the two
valves, one leading from the boiler and the other
from the mains supply. The connecting nuts need
only to be hand tight.
3. Slowly open both valves ensuring that water
does not leak from either end of the flexible
hose.
4. You will start to hear water passing across the
hose and valves and the grey needle on the
pressure guage will rise.
5. When the needle rises between 1 and 1.5 bar
close both valves, the needle should now remain
fixed.
6. The hose should then be disconnected from
at least one valve, a small amount of water will
emit from the hose, this is normal. If water
continues to issue from the hose the valve has
not been fully closed or is passing. If it is
passing you will need to contact your installer to
resolve the problem.

OPERATING THE APPLIANCE GREENSTAR HEATSLAVE 12/18 - 18/25 - 25/32
8 716 106 253c (11.07)
12
USING YOUR
APPLIANCE
OPERATING THE APPLIANCE
FAULT CONDITIONS: 12/18 AND 18/25
MODELS
The Power on and Lockout lights can indicate
some basic fault conditions.
(1) Normal operation:
Light ON
Mains power supply to boiler.
(2) Both lights on:
Boiler not firing
Check the level in the oil tank.
Remove the front white panel on the
appliance (see Ebelow) and press the
Reset button (G). The boiler should fire.
If there is no response, wait 2 minutes and
press the Reset Button (G) again.
If Lockout light stays on, do not attempt
further resets. Contact your service
engineer for advice.
(3) Power on light on, lockout light off:
Boiler not on -
No heating/hot water
Check the programmer is set to ON and
roomstat is calling for heat.
Press Reset Button (H), press Reset Button
(J) both are below the fascia, behind the
front white panel (see Ebelow).
If the boiler remains off, contact your service
engineer for advice.
(4) Both lights off:
Boiler not on -
No heating/hot water
Ensure there is power supply to the boiler.
If there is power supply to the boiler contact
your service engineer for advice.
(5) Accessing Reset Buttons:
To access the Reset Buttons pull
the bottom of the front white panel and lift to
remove.
H
GJ
J
G
H
H
GJ
J
G
H
(1) NORMAL OPERATION:
(2) BOTH LIGHTS ON:
(3) POWER ON LIGHT ON LOCKOUT LIGHT OFF:
(5) ACCESSING RESET BUTTONS:
G
H J
GH
J

OPERATING THE APPLIANCE
GREENSTAR HEATSLAVE 12/18 - 18/25 - 25/32
8 716 106 253c (11.07)
13
USING YOUR
APPLIANCE
OPERATING THE APPLIANCE
FAULT CONDITIONS: 25/32 MODEL
The Power on and Lockout lights can indicate
some basic fault conditions”
(1) Normal operation:
Light ON
Mains power supply to boiler.
(2) Both lights on:
Boiler not firing
Check the level in the oil tank.
Remove the top panel on the appliance and
press the Reset button (A) on the control
box of the burner (see Ebelow).
If there is no response, wait 2 minutes and
press the Reset Button (A) again.
If Lockout light stays on, do not attempt
further resets. Contact your service
engineer for advice.
(3) Power on light on lockout light off:
Boiler not on -
No heating/hot water
Check the programmer is set to ON and
roomstat is calling for heat.
Press Reset Button (B), press Reset Button
(C) both are below the fascia, behind the
front white panel (see Ebelow).
If the boiler remains off, contact your service
engineer for advice.
(4) Both lights off:
Boiler not on -
No heating/hot water
Ensure there is power supply to the boiler.
If there is power supply to the boiler contact
your service engineer for advice.
(5) Accessing Reset Buttons:
To access the Reset Button (A) remove top
panel.
To access Reset Buttons (B) and (C) pull
the bottom of the front white panel and lift to
remove.
(1) NORMAL OPERATION:
(2) BOTH LIGHTS ON:
(3) POWER ON LIGHT ON LOCKOUT LIGHT OFF:
(5) ACCESSING RESET BUTTONS:

TIPS ON ENERGY SAVING GREENSTAR HEATSLAVE 12/18 - 18/25 - 25/32
8 716 106 253c (11.07)
14
ENERGY
SAVING
TIPS ON ENERGY SAVING
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.

GREENSTAR HEATSLAVE 12/18 - 18/25 - 25/32
8 716 106 253c (11.07)
15
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.
TIPS ON ENERGY SAVING
ENERGY
SAVING

MAINTAINING YOUR APPLIANCE GREENSTAR HEATSLAVE 12/18 - 18/25 - 25/32
8 716 106 253c (11.07)
16
MAINTENANCE
MAINTAINING YOUR APPLIANCE
Your new appliance 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 a competent person.
If you would like to know more about sevicing
options from Worcester, Bosch Group, please
visit www. 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 appliance 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 cover.
Maintenance tips:
Regularly check the oil level in the tank.
Regularly check the system pressure, ask your
installer for guidance.
Do not obstruct the flue outlet or the air inlet.

FAULT FINDING
Problem Cause Remedy
Switch off appliance 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
Bleed radiators, if fitted to
a sealed system recharge
heating system
Turn down thermostatic
radiator valves / room stat
Check setting
FAULT FINDING
GREENSTAR HEATSLAVE 12/18 - 18/25 - 25/32
8 716 106 253c (11.07)
17
MAINTENANCE

FAULT OR BREAKDOWN GREENSTAR HEATSLAVE 12/18 - 18/25 - 25/32
8 716 106 253c (11.07)
18
MAINTENANCE
APPLIANCE
DATA LABEL
days (excluding weekends) for priority
breakdown situations (no hot water and/or
heating).
Invoices for attendance and repair work carried
out on this appliance by any third party will not
be accepted.
APPLIANCE DATA LABEL
The data label can be found on the inside of the
appliance on top of the control box.
To access:
Lift top panel to release lugs.
To replace top panel:
Replace the top panel and gently push down
(from the edges so as not to damage the
panel) until it clips back into place.
FAULT OR BREAKDOWN
This appliance is supported in the UK by
Worcester, Bosch Group, part of BBT
Thermotechnology UK Ltd.
Specialist factory trained Service Engineers are
available to attend in the unlikely event that a
breakdown occurs on this appliance.
No charge will be made for parts and/or
labour providing:
An appliance fault is found and the
appliance has been installed within the past
24 months. Reasonable evidence of this
must be supplied on request
A call-out charge will be made where:
The appliance has been installed for over 24
months. OR
Our Field Service Engineer finds no fault
with the appliance (see Note). OR
Evidence 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 appliance installation
and servicing manual). OR
The cause of breakdown is misuse or with
other parts of your plumbing/heating system,
or with equipment not supplied by BBT
Thermotechnology UK Ltd.
Note: NO APPLIANCE 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 appliance.
In the case of a suspected fault, refer to the fault
finding section of this guide.
If in doubt contact Worcester, Bosch Group
quoting the boiler serial and model number.
These numbers are printed on a Data Label
which is located as shown opposite. (You can
record this information on the inside back cover
of this manual.)
In the unlikely event of an appliance fault or
breakdown please call the contact centre (see
inside front cover for details). 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