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USER INSTRUCTIONS
6720648665-00.1Wo
FLOOR STANDING RSF GAS FIRED CONDENSING COMBINATION BOILER
Greenstar Highflow 440CDi
ErP
& 550CDi
FOR SEALED CENTRAL HEATING SYSTEMS AND MAINS FED DOMESTIC HOT WATER
The appliances are for use with:
Natural Gas or L.P.G. (Cat. II 2H3P type C13, C33 & C53)
Natural Gas:
Highflow 440CDi
Highflow 550CDi
L.P.G.:
Highflow 440CDi
Highflow 550CDi
ErP
, GC number 47-406-89
ErP
, GC number 47-406-91
ErP
, GC number 47-406-90
ErP
, GC number 47-406-92
ErP
6 720 818 076 (2015/12)
UK/IE
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Preface
Preface
Please read these instructions carefully
These instructions are applicable to the Worcester, Bosch
Group boiler model stated on the front cover only.
These instructions apply in the UK/IE only and must be followed
except for any statutory obligation.
After installation please leave this User instruction Manual and
the Installation, Commissioning and Servicing Instructions
including the completed Benchmark Checklist with the user.
Dedicated to heating comfort
Thank you for purchasing a Greenstar gas-fired condensing
combination boiler manufactured by 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 our products are of exceptional quality and proven
reliability.
The Greenstar range in particular is extremely energy e fficient,
offering you economical running costs and value for money.
It sits in SEDBUK 2005 Band A, scoring highly in SEDBUK
2009, and is therefore among the top energy rated boilers
available.
There is also the reassurance of our no-nonsense 2 years parts
and labour guarantee, backed up by Worcester Total Cover, an
optional complete maintenance scheme to keep your boiler
operating at peak condition and efficiency.
3 Controls . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
3.1 Switching the boiler ON/OFF . . . . . . . 6
3.1.1 Switching ON . . . . . . . . . . . . . . . . . . . 6
3.2 Setting the central heating
temperature . . . . . . . . . . . . . . . . . . . . 6
3.2.1 Controlling the central heating . . . . . 6
3.3 Frost protection (for the boiler) . . . . 7
3.3.1 Frost protection (for the heating
system) . . . . . . . . . . . . . . . . . . . . . . . 7
3.4 Setting the domestic hot water
temperature . . . . . . . . . . . . . . . . . . . . 7
3.5 ECO indicator . . . . . . . . . . . . . . . . . . . 8
3.6 Fault condition . . . . . . . . . . . . . . . . . . 9
4 System pressure . . . . . . . . . . . . . . . . . . . . . . 10
4.1 Sealed heating systems . . . . . . . . . . 10
4.2 Locating the integral filling link . . . . 10
5 Boiler/compartment clearances . . . . . . . . 11
5.1 Boiler clearances . . . . . . . . . . . . . . . 11
5.2 Airing cupboard clearances . . . . . . . 12
5.3 Vented compartments . . . . . . . . . . . 12
6 Maintaining your Boiler . . . . . . . . . . . . . . . . 13
Contents
1 Symbols and safety precautions . . . . . . . . . 3
1.1 Explanation of symbols . . . . . . . . . . . 3
1.2 Safety precautions . . . . . . . . . . . . . . . 3
2 Product details . . . . . . . . . . . . . . . . . . . . . . . . 4
2.1 General information . . . . . . . . . . . . . . 4
2.2 Product data on energy consumption 4
2
7 Fault Finding . . . . . . . . . . . . . . . . . . . . . . . . . 13
7.1 Error codes . . . . . . . . . . . . . . . . . . . . 14
7.2 Extreme cold weather . . . . . . . . . . . 14
8 Fault or breakdown . . . . . . . . . . . . . . . . . . . 15
9 Environment / disposal . . . . . . . . . . . . . . . . 15
10 Tips on energy saving . . . . . . . . . . . . . . . . . 16
11 Glossary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
12 Guarantee . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
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1 Symbols and safety precautions
1.1 Explanation of symbols
Warning symbols
Safety instructions in this document are
framed and identified by a
warning triangle which is printed on a grey
background.
Signal words indicate the seriousness of the hazard in terms of
the consequences of not following the safety instructions.
• NOTICE indicates possible damage to property or
equipment, but where there is no risk of personal injury.
• CAUTION indicates possible personal injury.
• WARNING indicates possible severe personal injury.
Important information
Notes contain important information in cases
where there is no risk of personal injury or
material losses and are identified by the symbol
shown on the left.
Additional symbols
Symbol Meaning
1. a numbered step in an action sequence
▶ a step in an action sequence
•a list entry
– a list entry (second level)
1.2 Safety precautions
If you smell gas
A gas leak could potentially cause an explosion. If you smell gas,
observe the following rules.
▶ Prevent flames or sparks:
– Do not smoke, use a lighter or strike matches.
– Do not operate any electrical switches or unplug any
equipment.
– Do not use the telephone or ring doorbells.
▶ Turn off the gas at the meter or regulator
▶ Open windows and doors
▶ Warn your neighbours and leave the building
▶ Prevent anyone from entering the building.
▶ Move well away from the building: call Emergency Services
▶ LPG boilers: Call the supplier’s number on the side of the
gas tank
Symbols and safety precautions
Boiler Operation
This appliance can be used by children aged
from 8 years and above and persons with
reduced physical, sensory or mental capabilities
or lack of experience and knowledge, if they
have been given supervision or instruction
concerning use of the appliance in a safe way
and understand the hazards involved. Children
shall not play with the appliance. Cleaning and
user maintenance shall not be made by children
without supervision.
Combustible and Corrosive Materials
Chemically aggressive substances can corrode the boiler and
invalidate any guarantee.
• Do not store or use any combustible materials (paper,
thinners, paints, propellants, cleaning agents etc.) inside
the cupboard containing the boiler or within the vicinity of
the appliance.
Fittings and Modifications
Only a competent registered gas engineer, such as a Gas Safe
registered engineer or British gas engineer can remove the
boiler’s inner combustion chamber cover and carry out any
work, in accordance with the Gas Safety (Installation and Use)
Regulations.
• Do not remove the inner combustion chamber cover.
Any misuse or unauthorised modifications to the boiler, flue or
associated accessories and heating system will invalidate the
guarantee.
• Do not modify the boiler or flue system in any way.
Worcester, Bosch Group accepts no liability arising from any
such actions. This does not affect your statutory rights.
Cleaning the boiler case
Use a damp, soft cloth to clean the outer painted metal case of
the boiler, do not use chemicals or abrasive materials.
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Product details
2 Product details
2.1 General information
Servicing
Ensure that the service engineer completes the
Service Record in the Benchmark Checklist
after each service. The Benchmark Checklist
and service interval record can be found at th e
back of the Installation, Commissioning and
Servicing Instructions.
• The boiler must be serviced annually by a competent,
registered gas engineer, such as a Worcester service
engineer, or other Gas Safe registered engineer.
• Always use original spares, to help maintain the efficiency,
safety and reliability of the boiler and have the Service
Record completed in the Benchmark Checklist.
The completed Benchmark Checklist will be required in the
event of any guarantee work and may be required by the local
Building Control Inspector.
BENCHMARK STANDARD
The Benchmark initiative is a
code of practice to encourage
the correct installation,
commissioning and servicing of
domestic central heating boilers
and system equipment.
A checklist/logbook is supplied with every boiler and can be
found at the back of the Installation, Commissioning and
Servicing Instructions. This is a vital document that needs to be
completed by the installer at the time of installation. It confirms
that the boiler has been installed and commissioned according
to the manufacturer's instructions.
The log book provides space for the recording of regular
servicing of the boiler/heating system and this can become a
valuable document when, for example, you wish to sell the
property. The log book will show a potential purchaser that the
heating system has received regular professional maintenance
and servicing during its lifetime.
The Benchmark initiative aims to:
• Raise standards among professional installers
• Build and maintain high safety standards in the industry
• Improve customer satisfaction levels
• Make a contribution to the nation's commitment t o climate
change
2.2 Product data on energy consumption
The product data on energy consumption can be found in the
Installation, Servicing and Maintenance manual instructions for
contractors.
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3 Controls
▶ To gain access to the controls, pull the flap towards you and swing down.
Controls
1
13
12
11
10
Fig. 1 Basic boiler controls
1
Master switch for ON/OFF 8 Not used
2
Boiler
Controls
Position for optional programmer 9 Hot water temperature control
3
Power ON and fault indicator (blue) 10 Central heating temperature control
4
Boiler display 11 Service Engineer button only
5
System pressure gauge 12 Service Engineer button only
6
Reset button 13 Burner ON indicator light (green)
7
ECO button (Domestic Hot Water pre-heat control)
2
3
4
2
1
3
bar
04
reset
eco
5
6
7
4
3
2
1
5
6
max
4
3
2
1
e
6
maxmin
8
9
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Controls
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1
2
3
4
5
6
max
2
3
1
04
bar
reset
eco
1
2
3
4
e
6
maxmin
3
1
1.
1
2
3
4
5
6
max
2
3
1
04
bar
reset
eco
1
2
3
4
e
6
maxmin
13
Min
1
2
3
4
5
6
Max
---
---
---
---
---
---
---
---
40 °C
47 °C
53 °C
61 °C
68 °C
74 °C
80 °C
82 °C
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3.1 Switching the boiler ON/OFF
3.1.1 Switching ON
1. Switch on the boiler by pressing the main power button [1].
The power indicator light shows blue[3].
Fig. 2 Power button
The boiler runs for 15 minutes at minimum heating output to fill the condensate trap. The display alternates
between and the central heating flow temperature. This occurs every time the mains supply has been
interrupted.
Switching off
▶ Switch off the boiler by pressing the main power button.
The blue power button light goes out.
3.2 Setting the central heating temperature
1. Turn the central heating temperature control [10] to the desired level, between approximately 40 and 82 °C.
When the burner is lit, the green indicator light [13] underneath the on/off switch is illuminated.
Fig. 3 Settings for the central heating temperature (with approximate temperatures)
3.2.1 Controlling the central heating
Central heating systems must be controlled effectively using a programmer or timer and a room thermostat.
▶ For further information on how to control your central heating system please refer to the individual user guides for the
programmer or timer installed in your home.
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3.3 Frost protection (for the boiler)
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1
2
3
4
5
6
max
2
3
1
04
bar
reset
eco
1
2
3
4
e
6
maxmin
10
1
Activating frost protection will turn off the central heating system.
Heating of domestic water will stay activated.
If the temperature within the boiler drops to 5 °C the boiler will fire to avoid the possibility of freezing.
To activate frost protection:
▶ Leave master switch on [1].
▶ Turn the central heating temperature control [10] to .
3.3.1 Frost protection (for the heating system)
If remote pipework is likely to be subject to freezing conditions:
▶ Ensure the installer has fitted a frost/pipe thermostat in the area to protect the pipework from freezing.
▶ Ensure the installer has added a suitable anti-freeze fluid to the water in the central heating system.
Controls
3.4 Setting the domestic hot water temperature
▶ Turn the domestic hot water temperature control [9] to the desired level, between approximately 45 and 65°C.
This is the temperature of the water produced at the boiler, not at the tap.
This a guide only, it depends on the length of the pipe run to the taps as to the temperature that is deli vered to the tap.
2
1
45 °C
Min
Max
Fig. 4 Settings for domestic hot water temperature (with approximate temperatures)
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50 °C
---
1
52 °C
---
2
54 °C
---
3
56 °C
---
4
---
e
---
6
---
2
1
4
3
58 °C
60 °C
65 °C
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9
5
6
max
4
3
2
1
e
reset
eco
1.
6
maxmin
3
bar
04
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Controls
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1
2
3
4
5
6
max
2
3
1
04
bar
reset
eco
1
2
3
4
e
6
maxmin
7
3.5 ECO indicator
By default the boiler is set to ECO mode, so if the mains supply to the boiler is interrupted, the ECO mode will
become active.
Press the ECO button until the light goes out if you require the boiler to be in Pre-heat mode.
Refer to the explanation below for ECO and Pre-heat modes
You can choose to run your boiler in Pre-heat mode or in ECO mode.
To activate pre-heat mode:
▶ Press the ECO button [7] until it is no longer illuminated.
When the ECO button [7] is NOT lit the boiler is in pre-heat mode for hot water.
Pre-heat will ensure the storage tank temperature is maintained and will allow high flow rates of hot water to be drawn off at taps.
Hot water will now be available at the tap almost immediately as the boiler constantly maintains a tank of hot water ready for use.
To activate ECO mode:
▶ Press the ECO button [7] until it is illuminated.
When the ECO button is illuminated, the boiler runs in ECO mode and pre-heat is not available.
When the ECO button [7] is lit the storage tank pre-heat function is turned off, but the boiler will supply hot water as a normal Combi
boiler.
This means that the flow rates at taps may have to be reduced to obtain satisfactory hot water temperatures.
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Controls
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1
2
3
4
5
6
max
2
3
1
04
bar
reset
eco
1
2
3
4
e
6
maxmin
4
3
6
3.6 Fault condition
In the unlikely event of a fault occurring while the boiler is in operation the reset button [6] and the main power indicator [3] will
flash.
The display [4] will show a fault code.
To reset the boiler:
▶ Press the reset button [6] for three seconds.
The reset button [6] and the mains power indicator [3] will stop flashing.
The boiler will function normally, dependent on programmer and room thermostat settings.
If the fault cannot be cleared by pressing the reset button [6]:
▶ Refer to the fault finding section on page 13 of this user guide.
▶ Call Worcester, Bosch Group, giving a description of the fault and, if possible, the fault code from the seven
segment display. Alternatively contact a competent registered gas engineer, such as a Gas Safe registered
engineer or British Gas engineer for assistance.
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System pressure
4System pressure
4.1 Sealed heating systems
This boiler is fitted to a sealed heating system which will have
been pressurised by your installer. Your instal ler will advise you
of the minimum and maximum pressure indicated on the
pressure gauge.
▶ Check regularly that the pressure is maintained.
▶ If the pressure gauge reads less than 1 bar then the system
requires re-charging.
▶ Contact your installer or maintenance engineer, such as a
Gas Safe registered engineer, if a permanent significant
decrease or increase in pressure is indicated on the
pressure gauge.
The filling method is an integral filling loop fitted with nonreturn valves and flexible hose.
1.
1.
2.
4.2 Locating the integral filling link
To access the filling loop connection:
1. Pull the upper edges of the front panel forwards.
2. Lift front panel.
Using the filling loop:
3. Unscrew the tank drain cap from the Tank drain valve.
4. Connect the integral filling loop from the Flow valve [1]
using the hose [2] to the Tank drain valve [3].
5. Open the flow and tank drain valves.
▶ Fill the system to a pressure up to 1.5 bar.
▶ Close the flow valve.
▶ Close the tank drain valve.
▶ Disconnect the integral filling loop.
▶ Refit tank drain cap.
1.5 bar
Max
1 bar
P
Min
1
2
Fig. 5 Integral filling loop
10
3.
3
1
2
4.
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5 Boiler/compartment clearances
6720818077-08.1Wo
Your installer will have provided adequate space around the boiler for safety and servicing access.
CAUTION: Restricted space.
The boiler may overheat.
▶ Do not restrict this space with the addition of cupboards, shelves etc. next to the boiler.
5.1 Boiler clearances
item Minimum distance requirements for compartments
1 Overall height of compartment
2 Overall depth of compartment
3 Overall width of compartment
4 Height above the boiler to top of compartment
5 Depth to front of boiler (or shelf)
6 Gap between sides of boiler and compartment
7 Gap between shelf and back of compartment
CLEARANCES
Refer to the figure above and the table below for the minimum
clearances to service the boiler and for an unventilated
compartment.
Boiler/compartment clearances
Compartment clearances (mm)
item Servicing Unventilated
1865 900
2 1200 800
3610 800
415 50
1)
5600
65 100
200
2)
3)
1) Can be reduced to 25mm to removable
surface
2) Space required with removable door or
panel
3) Ca n be reduced to 50mm on one side, but
maintaining the overall 200 minimum
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Boiler/compartment clearances
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1
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2
1
3
5.2 Airing cupboard clearances
The dimensions below show the minimum space required to install and service the boiler within an airing cupboard.
If a compartment is built around the boiler after installation, then the compartment must be separated from the boiler space by a
noncombustible partition as described in BS 6798.
item Minimum clearances (mm)
1 2300
2 625
3 800
4 200
1)
5 25
6 100
7 100
1) From the front of the boiler and the front of the shelf
5.3 Vented compartments
If the clearances available are less than those stated for an unventilated compartment or an airing cupboard then ventilation must
be provided as described in BS 5440.
A minimum of two air vents of equal size must be fitted, one at low level and another at high level on the same wall using the same
air for circulation.
# Boiler Air source Vent area
1
2
440CDi
550CDi
440CDi
550CDi
Internal room or
ErP
space
ErP
Outside 155cm
ErP
220cm
310cm
440cm
ErP
3 All 100mm space between the
boiler and vent
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2
2
2
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Maintaining your Boiler
6 Maintaining your Boiler
Your new gas-fired boiler represents a long term investment in a reliable, high quality product.
To clean, wipe the boiler casing with a soft clean cloth. Please do not use chemical cleaning products which may damage the paint
finish.
In order to realise its maximum working life, and to ensure it continues to operate at peak efficiency and performance, it is essential
that your boiler receives regular annual servicing and maintenance checks during and beyond the guarantee period from a
competent registered gas engineer, such as a Worcester service engineer or other Gas Safe registered engineer.
If your Greenstar gas-fired boiler should fail to operate correctly or requires servicing, please contact the Worcester, Bosch Group
Appointments Team (see rear cover for details).
Details of the boiler including the Gas Council number can be found on the front cover of these User Instructions and on the boiler
identification label on the boiler fascia.
The Gas Council number is also listed on the front cover of your Installation, Commissioning and Servicing Instructions.
7Fault Finding
In the event that the boiler stops functioning or does not perform as expected, you can carry out a few simple checks. The checks
listed in the table below detail some of the possible causes. Should the problem persist or if other fault codes are displayed, then it
will be necessary to contact the Worcester, Bosch Group.
This table gives information on basic operating system problems.
Problem Cause Remedy
EA fault code flashing on
display
Desired room
temperature is not
reached
Desired room
temperature too high
Heating stays on for too
long
ON/OFF Indicator is not
illuminated
Hot water temperature
too low
Hot water temperature
too high
Table 1 Fault finding
No gas supply/low gas supply pressure ▶ Contact your gas supplier.
Condensate outlet blocked
▶ If it is safe to do so, check your condensate pipe
outlet for blockages, such as ice or foreign objects.
Flue blocked
▶ If it is safe to do so, check your flue outlet for
damage or blockages.
Thermostatic radiator valve(s) set too low ▶ Increase thermostatic radiator valve setting(s)
Temperature control for central heating flow
on boiler set too low
Air trapped in heating system
Low system water pressure
Boiler temperature controls set too low
▶ Increase central heating flow temperature control
setting
▶ Bleed radiators and recharge heating system
▶ Re-pressurise the system, refer to page 10
▶ Increase settings on boiler controls
Radiators are too hot ▶ Turn down thermostatic radiator valves/room
thermostat
▶ Reduce central heating temperature by turning
down the Central Heating control on boiler
Timer or programmer is incorrectly set ▶ Check setting and adjust
Momentary power failure ▶ Disconnect boiler supply, wait a few seconds then
reconnect.
Temperature set too low on boiler controls ▶ Check setting and adjust
Water flow at tap too high
Air trapped in heating system
Low system water pressure
▶ Reduce flow rate at tap
▶ Bleed radiators and recharge heating system
▶ Re-pressurise the system, refer to page 10
Temperature set too high on boiler controls ▶ Check setting and adjust
Water flow at tap too low
▶ Increase flow rate at tap
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Fault Finding
7.1 Error codes 7.2 Extreme cold weather
When calling Worcester, Bosch Group, you
may be asked for the error code. This table is
for you to help identify the possible cause of
the fault.
▶ Do not try to rectify any of the faults listed
below by yourself.
▶ Contact a Worcester, Bosch Group service
engineer, or other Gas Safe registered
engineer.
Error code Description
A7 Hot water NTC sensor defective.
A8 Break in communication to weather
compensating clip-in control or Greenstar
Comfort II RF
b1 Code plug not detected.
C6 Fan speed too low.
d5 Condensate pump fault
E2 CH flow NTC sensor defective.
E9 Safety temp. limiter in CH flow has tripped.
EA Flame not detected.
Check, if it is safe to do so:
• if gas is on in the house
• for frozen condensate pipe
• for blocked flue outlet
F0 Internal error.
F7 Flame detected even though boiler switched
off.
FA Flame detected after gas shut off.
Fd Reset button pressed by mistake.
SE Service required
U1 Boiler flow temperature is too high,
the boiler will shut down until it has cooled
U2
down
U3
In some instances where the condensate pipe work is run
externally or in an unheated area, such as a garage, the
condensate pipe work can be at risk of freezing, even if well
insulated.
A frozen/blocked condensate pipe will cause the boiler to shut
down.
WARNING: Falling hazard!
Failure to follow this guidance may result in
personal injury.
▶ Only attempt to thaw a condense pipe that
is at ground level, and that is easily
accessible.
▶ Never attempt to thaw a condense pipe
that is at height.
CAUTION: Pipe damage
▶ DO NOT use boiling water to thaw the
condensate pipe!
CAUTION: Slip hazard
▶ Ensure that the subsequent freezing of any
water does not result in a slip hazard
If the condensate pipe has frozen:
▶ Locate the blockage.
It is likely that the pipe is frozen at the most exposed point
outside the building or where there is an obstruction to
flow.
This could be the open end of the pipe, at a bend or elbow,
or where there is a sag in the pipe in which condensate can
collect.
The location of the blockage should be identified as closely
as possible before taking further action.
▶ Thaw the frozen pipe.
The pipe can be thawed by applying a hot water bottle, a
microwaveable heating pack (the sort used for muscular
aches and pains) or a cloth soaked in hot water to the
exterior of the pipe, close to the point of blockage.
Hot water, but not boiling, can also be poured onto the pipe
from a watering can or similar container.
▶ Once the pipe has been thawed the boiler must be reset,
press the reset button for five seconds and wait two to
three minutes for the boiler to restart.
▶ If the boiler does not restart, contact Worcester, Bosch
Group Appointments Team (see back cover for details).
▶ Contact your installer in order to find a permanent solution
to the problem.
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Fault or breakdown
8 Fault or breakdown
This boiler is supported in the UK and Eire by Worcester, Bosch
Group.
Specialist service engineers are available to attend a
breakdown occurring on this boiler.
Invoices for attendance and repair work
carried out on this boiler by any third party will
not be accepted.
• No charge will be made for parts and/or labour providing:
A boiler fault is found and the boiler is within the guarantee
period. Reasonable evidence of this must be supplied on
request. i.e. the Benchmark Checklist.
• A call-out charge will be made where:
– The boiler is outside the guarantee period.
– Evidence cannot be provided that the annual service
inspections have been carried out (i.e. entries in the
Benchmark Checklist).
– Our Field Service Engineer finds no fault with the
boiler.
– The cause of breakdown is misuse or with other parts of
your plumbing/heating system, or with equipment not
supplied by Worcester, Bosch Group.
Technical support
No boiler fault is found on over 30% of all
service calls.
In the case of a suspected fault, refer to the
fault finding section of this guide.
In the event of a boiler fault or breakdown please contact
Worcester, Bosch Group appointments team (see back cover
for details)
Your advisor will arrange for an engineer to call with the
minimum of delay.
9 Environment / disposal
Environmental protection is a fundamental corporate strategy
of the Bosch Group.
The quality of our products, their economy 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 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 compatible
and can be recycled.
USED APPLIANCES
▶ Greenstar gas boilers are 100% recyclable.
The various assemblies can be easily
dismantled and synthetic materials are
marked accordingly.
Assemblies can therefore be sorted by
composition and passed on for recycling.
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Tips on energy saving
10 Tips on energy saving
Heating economically
The boiler provides a high level of comfort whilst keeping gas
consumption low and so minimising the environmental impact.
The gas supply to the boiler‘s burner is regulated according to
the demand for heat. The boiler operates with a low flame if the
dem and for h eat redu ces . The tec hnic al te rm f or th is p roce ss i s
modulating control.
Modulating control reduces temperature fluctuations and
provides an even distribution of heat throughout the home.
This means that the boiler may stay on for relatively long
periods of time but will use less gas than a boiler that
continually switches on and off.
Central heating systems with room thermostat/ thermostatic radiator valves
With modern heating systems designed around a 20 °C heat
loss across the system, the optimum setting for a condensing
boiler will be approximately between the first and second
segment on the central heating temperature control. The
system must be balanced correctly and the radiators may need
upgrading.
The temperature of each room can be set individually (except
primary room with the room thermostat) using the
thermostatic radiator valves.
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 if necessary with the
latest equipment available.
Roof insulation
Around 30% of the heat loss from a property is through the
roof. Replace any old insulation with new insulati on, preferably
of around 200mm thickness or more.
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.
Radiators
If a radiator is sited underneath a window, its performance will
be affected if the curtains are allowed to drape over the
radiator. Shelves fitted above or in front of the radiator should
also be avoided.
It is advisable to manually adjust all thermostatic radiator
valves every 2 - 3 months to prevent them sticking. Ensure
radiator valves are correctly set and not damaged.
Draughts
Try to ensure that draughts around doors, windows, letter
boxes and keyholes etc. are reduced by using a suitable
draught excluder.
WARNING: Air vents
▶ Do not block or seal any air vents that are
installed to ensure that the cent ral heating
boiler operates safely.
Curtains
Lined curtains, or heavier full length curtains can provide
excellent insulation. However, always ensure that the curtains
do not drape over radiators.
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11 Glossary
Central heating systems
All radiators must be heated at an even rate. If the top of a
radiator is at a lower temperature than the bottom then it
should be bled by releasing air through the bleed screw at the
top of the radiator.
Ask your installer to show you how this is done.
This boiler is fitted to a sealed system. Should water leaks be
found or if excessive bleeding is required, then a service
engineer must be contacted to inspect the installation and
rectify any fault.
Only additives that are co mpatible with aluminium may be used
in the system. Any incompatible additive used will invalidate
the guarantee.
Pluming and condensate drain
This is a condensing boiler and the flue terminal will, at times
give out a plume of water vapour. This is quite normal.
The boiler produces condensate which is discharged regularly
from within the boiler via a plastic pipe to a drain point. This
pipe must not be blocked or altered in any way.
Room thermostat / programmer
A room thermostat and a twin channel programmer must be
fitted to control the central heating and hot water. This controls
the timing of the central heating and hot water, preventing the
boiler from firing unnecessarily. If pre-heat mode is used, then
this mode can be timed to be on during times of high demand.
Refer to the instructions supp lied with the thermostat and twin
channel programmer for further information.
Thermostatic radiator valves
Thermostatic radiator valves must be fitted in sleeping
accommodation. It is recommended that this type of valve is
fitted to all but one of the radiators. The remaining radiator,
where the room thermostat is located, must be uncontrolled
and left open.
Pump over run function
After the boiler has finished a demand for central heating or hot
water, the pump may continue to run for a short while to
dissipate the heat from within the boiler.
Pump anti-seizure
If there has been no heating demand for 24 hours, the boiler
will run the system pump for a few seconds to reduce the
possibility of pump seizure during long periods of inactivity.
SEDBUK
Seasonal Efficiency of Domestic Boilers in the UK.
Glossary
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Guarantee
12 GUARANTEE
Guarantee Terms and Conditions
This appliance is guaranteed against faulty materials or
workmanship for a period of 24 calendar months from the date
of installation subject to the following conditions and
exceptions;
(i) that 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,
(ii) the product must be maintained in accordance with the
manufacturer's instructions and serviced annually, by a
Gas Safe registered engineer. Proof of servicing will be
required to validate a guarantee
(iii) invoices for attendance and repair of this appliance by
third parties will not be accepted for payment by Bosch
Thermotechnology Ltd,
(iv) that the householder may be asked to prove the date of
installation and that the appliance was correctly
commissioned,
(v) the guarantee must be registered within 30 days of
installation.
(vi) that any product or part thereof r eturned for servicing
under the guarantee must be accompanied by a claim
stating the Model, Serial Number, Date of Installation,
(vii) that Bosch Thermotechnology Ltd will not accept
responsibility for damage caused by faulty installation,
neglect, misuse or accidental damage or the nonobservance of the instructions contained in the
Installation and Users Instructions leaflets,
(viii) that the appliance has been used only for normal
domestic purposes for which it was designed,
(ix) that this guarantee applies only to equipment purchased
and used in the United Kingdom of Great Britain and
Northern Ireland, the Republic of Ireland, the Isle of Man or
the Channel Islands.
'For full terms and conditions, please visit:
worcester-bosch.co.uk/guarantee-terms-and-conditions.
Guarantee registration
Your Greenstar appliance carries a guarantee against faulty
material or manufacture subject to Terms and Conditions.
Guarantee Registration can be completed:
• Via the Worcester, Bosch Group guarantee app:
– By scanning the appliance label QR code, all the
appliance information is populated in the app, so you
just need to fill out the property and installer details
•On-line:
– You can register on our website:
www.worcester-bosch.co.uk/guarantee
•By post:
– Fill out the guarantee card and return it to Worcester,
Bosch Group
• By telephone:
– Please call one of our Guarantee Registration advisors
on 0330 123 9559
The guarantee app can be downloaded to your
smart device from Apple iTunes, Google Play or
via the Worcester, Bosch Group website
For your own records
Please ensure that the Benchmark Checklist has been
completed by your installer or service engineer.
Model
Serial No.
Type/Size
Date of installation
Name of installer
Telephone number of installer
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NOTES
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Worcester, Bosch Group
Cotswold Way, Warndon, Worcester WR4 9SW.
Tel. 0330 123 9559
Worcester, Bosch Group is a brand name of
Bosch Thermotechnology Ltd.
worcester-bosch.co.uk
6 720 818 076 (2015/12)
WORCESTER, BOSCH GROUP:
TECHNICAL SUPPORT: 0330 123 3366
APPOINTMENTS: 0330 123 9339
SPARES: 0330 123 9779
LITERATURE: 0330 123 9119
TRAINING: 0330 123 0166
SALES: 0330 123 9669
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