Worcester GREENSTAR HIGHFLOW 440CDI ERP User manual

UK/IE
USER INSTRUCTIONS
FLOOR STANDING RSF GAS FIRED CONDENSING COMBINATION BOILER
GREENSTAR HIGHFLOW 440CDi & 550CDi
6720648665-00.1Wo
FOR SEALED CENTRAL HEATING SYSTEMS AND MAINS FED DOMESTIC HOT WATER
6 720 815 063 (2015/05)
The appliances are for use with:
Natural Gas or L.P.G. (Cat. II 2H3P type C13, C33 & C53)
Natural Gas:
440CDi ErP, GC number 47-406-85
550CDi ErP, GC number 47-406-87
L.P.G.:
440CDi ErP, GC number 47-406-86
550CDi ErP, GC number 47-406-88
ErP ErP

2
preface
GREENSTAR HIGHFLOW CDi ErP– 6 720 815 063 (2015/05)
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,
Installation, Commissioning and Servicing Instructions and
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 50 years. This heritage means all
our products are of exceptional quality and proven reliability.
The Greenstar range in particular is extremely energy efficient,
offering you economical running costs and value for money. It
sits in SEDBUK 2005 Band A, scoring highly in SEDBUK 2009,
and is therefore amongst 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.
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
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 . . . . . . . . . . . . . . . . . . . . . . . 9
4.1 Sealed heating systems . . . . . . . . . . . 9
4.2 Locating the integral filling link . . . . 10
5 Clearances . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
6 Maintaining your Boiler . . . . . . . . . . . . . . . . 12
7 Fault Finding . . . . . . . . . . . . . . . . . . . . . . . . . 13
7.1 Error codes . . . . . . . . . . . . . . . . . . . . 14
7.2 Extreme cold weather . . . . . . . . . . . 15
8 Fault or Breakdown . . . . . . . . . . . . . . . . . . . 16
9 Tips on energy saving . . . . . . . . . . . . . . . . . . 17
10 Environment / disposal . . . . . . . . . . . . . . . . 18
11 Your guarantee . . . . . . . . . . . . . . . . . . . . . . . 18
12 Glossary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

3
Symbols and safety precautions
GREENSTAR HIGHFLOW CDi ErP – 6 720 815 063 (2015/05)
1 SYMBOLS AND SAFETY PRECAUTIONS
1.1 EXPLANATION OF SYMBOLS
WARNING SYMBOLS
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
ADDITIONAL SYMBOLS
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.
▶ Well away from the building: call the National Gas
Emergency Service on 0800 111 999.
▶ L.P.G. boilers: Call the supplier’s number on the side of the
gas tank.
BOILER OPERATION:
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.
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 engineer can remove the boiler case and
carry out any work, in accordance with the Gas Safety
(Installation and Use) Regulations.
• Do not remove the boiler case.
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.
Safety instructions in this document are
framed and identified by a
warning triangle which is printed on a grey
background.
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.
They are bordered by horizontal lines above
and below the text.
Symbol Meaning
1. a numbered step in an action sequence
▶ a step in an action sequence
a reference number to identify or refer to a part or
item
• a list entry
– a list entry (second level)
1

4
Product details
GREENSTAR HIGHFLOW CDi ErP– 6 720 815 063 (2015/05)
2 PRODUCT DETAILS
2.1 GENERAL INFORMATION
SERVICING
• The boiler must be serviced regularly by a competent,
qualified person, 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” is dispatched with every boiler and can be found
towards 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 to climate
change
2.2 PRODUCT DATA ON ENERGY CONSUMPTION
The product data on energy consumption can be found in the
installation and maintenance instructions for contractors.
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 the rear of the Installation,
Commissioning and Servicing Instructions.

5
Controls
GREENSTAR HIGHFLOW CDi ErP – 6 720 815 063 (2015/05)
3 CONTROLS
▶ To gain access to the boiler controls pull the flap down.
Fig. 1 Basic boiler controls
Boiler
Controls
1Master switch for ON/OFF 8 Not used
2Position for optional programmer 9 Hot water temperature control
3Power ON and fault indicator (blue) 10 Central heating temperature control
4Boiler display 11 Service Engineer button only
5System pressure gauge 12 Service Engineer button only
6Reset button 13 Burner ON indicator light (green)
7ECO button (Domestic Hot Water pre-heat control)
6720806267-01.1Wo
1
2
34
5
6
max
2
3
1
04
bar
1
reset
eco
1
2
34
e
6
maxmin
10
11
12
1
13
9
8
7
5
234
6

6
Controls
GREENSTAR HIGHFLOW CDi ErP– 6 720 815 063 (2015/05)
3.1 SWITCHING THE BOILER ON/OFF
3.1.1 SWITCHING ON
1. Switch on the boiler by pressing the main power button.
The power indicator light shows blue[1].
Fig. 2 Power button
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 to the desired level, between approx. 35°C and 90°C.
When the burner is lit, the green indicator light underneath the on/off switch is illuminated [1].
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.
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.
6720806267-02.1Wo
1
2
34
5
6
max
2
3
1
04
bar
1
reset
eco
1
2
34
e
6
maxmin
1
1.
1.
1
2
34
5
6
max
2
3
1
04
bar
1
reset
eco
1
2
34
e
6
maxmin
1Min
1
2
3
4
5
6
Max
---
---
---
---
---
---
---
---
40 °C
47 °C
53 °C
61 °C
68 °C
74 °C
80 °C
82 °C
6720806267-03.1Wo

7
Controls
GREENSTAR HIGHFLOW CDi ErP – 6 720 815 063 (2015/05)
3.3 FROST PROTECTION (FOR THE BOILER)
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.
▶ Turn the central heating control temperature control 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 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.
3.4 SETTING THE DOMESTIC HOT WATER TEMPERATURE
1. Turn the domestic hot water temperature control to the desired level, between approximately 40°C and 60°C.
Fig. 4 Settings for domestic hot water temperature (with approximate temperatures)
6720806267-04.1Wo
1
2
34
5
6
max
2
3
1
04
bar
1
reset
eco
1
2
34
e
6
maxmin
1.
6720806267-05.1Wo
1
2
34
5
6
max
2
3
1
04
bar
1
reset
eco
1
2
34
e
6
maxmin
1.
Min
1
2
3
4
e
6
Max
---
---
---
---
---
---
---
---
45 °C
50 °C
52 °C
54 °C
56 °C
58 °C
60 °C
65 °C

8
Controls
GREENSTAR HIGHFLOW CDi ErP– 6 720 815 063 (2015/05)
3.5 ECO INDICATOR
You can choose to run your boiler in pre-heat mode or in ECO mode. Pre-heat reduces the time taken to produce hot water at the
tap and is controlled by the ECO button. When the ECO button is illuminated, the boiler runs in ECO mode and pre-heat is not
available.
When the ECO button is lit the pre-heated tank of hot water is turned off, but the boiler will supply hot water as a normal Combi
boiler.
It will take longer to obtain hot water at the tap in ECO mode as the boiler is not maintaining a supply of hot water for immediate use.
When the ECO button is NOT lit the boiler is in pre-heat mode for hot water.
Hot water will now be available at the tap almost immediately as the boiler constantly maintains a tank of hot water ready for use.
MANUALLY OPERATING THE PRE-HEAT MODE
To activate pre-heat mode:
▶ Press the ECO button until it is no longer illuminated.
To activate ECO mode:
▶ Press the ECO button until it is illuminated.
If your boiler has an in-built fascia mounted programmer and the mains supply is interupted, the ECO button will
need to be reset by pressing and holding for three seconds.
6720806267-06.1Wo
1
2
34
5
6
max
2
3
1
04
bar
1
reset
eco
1
2
34
e
6
maxmin
1.

9
System Pressure
GREENSTAR HIGHFLOW CDi ErP – 6 720 815 063 (2015/05)
3.6 FAULT CONDITION
In the unlikely event of a fault occurring while the boiler is in operation the reset button and the main power indicator will flash.
The display will show a fault code.
To reset the boiler:
▶ Press the reset button for three seconds.
The reset button and the mains power indicator will stop flashing.
The boiler will function normally, dependent on programmer and room thermostat settings.
4 SYSTEM PRESSURE
4.1 SEALED HEATING SYSTEMS
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.
▶ 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 if a permanent significant decrease or increase in pressure is indicated on the
pressure gauge.
The filling method is a integral filling loop fitted valves and flexible hose.
If the fault cannot be cleared by pressing the reset button:
▶ Refer to the fault finding section on page 15 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 other Gas Safe registered personnel for assistance.
6720806267-07.1Wo
1
2
34
5
6
max
2
3
1
04
bar
1
reset
eco
1
2
34
e
6
maxmin
1.
1
2

10
System Pressure
GREENSTAR HIGHFLOW CDi ErP– 6 720 815 063 (2015/05)
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.
Fig. 5 Integral filling loop
6720806267-08.1Wo
1
2
3
1
2
3
P
Min
1 bar
1.5 bar
Max
1.
2.
3.
4.
5.
1.

11
Clearances
GREENSTAR HIGHFLOW CDi ErP – 6 720 815 063 (2015/05)
5 CLEARANCES
Your installer will have provided adequate space around the boiler for safety and servicing access.
SERVICE CLEARANCES
Fig. 6 Service clearances
UNVENTILATED COMPARTMENT CLEARANCES
This is a room sealed boiler and does not require any air for combustion from inside the property.
In spite of the requirements of BS 6798 and BS 5440 there is no need for ventilation openings to be provided in the compartment
because of the low heat loss from the boiler casing, if the clearances shown are maintained.
Fig. 7 Unventilated compartment clearances
[*] Space required for unventilated areas with a removable door or panel, but 600mm to a fixed surface for servicing.
[**] This space can be reduced to 50mm for one side only as long as both side clearances add up to the total of both the side
measurements shown, or more.
CAUTION: Restricted space.
The boiler may overheat.
▶ Do not restrict this space with the addition of cupboards, shelves etc. next to the boiler.
6720806267-09.1Wo
15mm
5
m
m
61
0
mm
5
m
m
1200
m
m
8
65
m
m
6
00m
m
6720806267-10.1Wo
50
mm
10
0
m
m
**
8
0
0
m
m
1
00
mm
**
8
00
m
m
9
00
m
m
20
0
mm*

12
Maintaining your Boiler
GREENSTAR HIGHFLOW CDi ErP– 6 720 815 063 (2015/05)
AIRING CUPBOARD CLEARANCES
If the boiler is fitted into an airing cupboard then the diagram opposite shows the minimum clearances required around the boiler
and also the clearances for any shelf constructed above the boiler.
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.
Fig. 8 Airing cupboard clearances
[**] This space can be reduced to 50mm for one side only as long as both side clearances add up to the total of both the side
measurements shown, or more.
[***] Space required for airing cupboards with a removable door or panel, but 600mm to a fixed surface for servicing.
6 MAINTAINING YOUR BOILER
Your new gas-fired boiler represents a long term investment in a reliable, high quality product.
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 servicing and maintenance checks from a competent person beyond the initial two year guarantee
period.
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.
6720806267-11.1Wo
8
0
0
m
m
10
0
m
m
**
10
0mm
**
62
5m
m
10
0m
m
1
05
0
m
m
2
00
m
m
2
5m
m*
**

13
Fault Finding
GREENSTAR HIGHFLOW CDi ErP – 6 720 815 063 (2015/05)
7 FAULT FINDING
In the event that the boiler stops functioning or does not perform as expected, you can carry out a few simple checks. These checks
are some of the most common causes and are listed in the table below. 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
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.
Desired room temperature is
not reached
Thermostatic radiator valve(s) set too
low
▶ Increase thermostatic radiator valve setting(s)
Temperature control for central heating
flow on boiler set too low
▶ Increase central heating flow temperature
control setting
Air trapped in heating system ▶ Bleed radiators and recharge heating system
Low system water pressure ▶ Re-pressurise the system, refer to pages 10
Low temperature setting on the boiler
controls
▶ Increase settings on boiler controls
Desired room temperature too
high
Radiators are too hot ▶ Turn down thermostatic radiator valves/room
thermostat
▶ Reduce central heating temperature by turning
down the Central Heating control on boiler
Heating stays on for too long Clock is incorrectly set ▶ Check setting and adjust
ON/OFF Indicator is not
illuminated
Momentary power failure ▶ Disconnect boiler supply, wait a few seconds
then reconnect.
Hot water temperature too low Temperature set too low on boiler
controls
▶ Check setting and adjust
Water flow at tap too high ▶ Reduce flow rate at tap
Air trapped in heating system ▶ Bleed radiators and recharge heating system
Low system water pressure ▶ Re-pressurise the system, refer to pages 10
Hot water temperature too high Temperature set too high on boiler
controls
▶ Check setting and adjust
Water flow at tap too low ▶ Increase flow rate at tap
Table 1 Fault finding

14
Fault Finding
GREENSTAR HIGHFLOW CDi ErP– 6 720 815 063 (2015/05)
7.1 ERROR CODES
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 British Gas or a competent, qualified engineer (Gas Safe registered personnel).
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.
E2 CH flow NTC sensor defective.
E9 Safety temp. limiter in CH flow has tripped.
EA Flame not detected.
Check, if it 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.

15
Fault Finding
GREENSTAR HIGHFLOW CDi ErP – 6 720 815 063 (2015/05)
7.2 EXTREME COLD WEATHER
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.
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 on:
0330 123 9339.
▶ Contact your installer in order to find a permanent solution to the problem.
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!

16
Fault or Breakdown
GREENSTAR HIGHFLOW CDi ErP– 6 720 815 063 (2015/05)
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.
• 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 first year service inspection has been carried out (i.e. an entry 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
In the event of a boiler fault or breakdown please contact Worcester, Bosch Group appointments team on 0330 123 9339.
Your advisor will arrange for an engineer to call with the minimum of delay; priority will be given to 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.
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.

17
Tips on energy saving
GREENSTAR HIGHFLOW CDi ErP – 6 720 815 063 (2015/05)
9 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
demand for heat reduces. The technical term for this process is 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 insulation, 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.
CURTAINS
Lined curtains, or heavier full length curtains can provide excellent insulation. However, always ensure that the curtains do not
drape over radiators.
WARNING: Air vents
▶ Do not block or seal any air vents that are installed to ensure that the central heating boiler operates safely.

18
Environment / disposal
GREENSTAR HIGHFLOW CDi ErP– 6 720 815 063 (2015/05)
10 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.
11 YOUR GUARANTEE
This boiler has a guarantee against faulty materials or workmanship for a period of two years from the date of installation subject to
the following terms and conditions:
• During the period of this guarantee any components of the boiler which are proven to be faulty or defective in manufacture will
be exchanged or repaired free of charge by Bosch Thermotechnology Ltd.
• The householder may be asked to prove the date of installation, that the boiler was correctly commissioned and, where
appropriate, the first year's service has been carried out to the satisfaction of Bosch Thermotechnology Ltd., when requested.
These should be documented as a part of the Benchmark Checklist.
• The boiler has been used only for the normal domestic purposes for which it was designed.
This guarantee does not affect your statutory rights.
GUARANTEE REGISTRATION
Your Greenstar boiler carries a two year guarantee against faulty material or manufacturer subject to Terms and Conditions.
To read the full Terms & Conditions please visit us on-line at www.worcester-bosch.co.uk/guarantee. The Guarantee Registration
form is available on this same page and can be completed and submitted electronically.
Alternatively, please telephone one of our Guarantee Registration advisors on 0330 123 9559.
Your statutory rights are not affected by the manufacturers guarantee.
FOR YOUR OWN RECORD:
Please ensure that the Benchmark Checklist has been completed by your installer or service engineer.
USED APPLIANCES
▶ All Greenstar gas boilers are 100% re-cycleable.
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.
Model
Serial No.1)
1) See boiler identification label on boiler fascia or Benchmark Checklist in the back of the Installation, Commissioning & Servicing
Instructions.
Type/size
Date of installation
Name of Installer
Telephone number of Installer
Table 2

19
Glossary
GREENSTAR HIGHFLOW CDi ErP – 6 720 815 063 (2015/05)
12 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 compatible 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 by a syphon within the boiler via a plastic pipe to a drain. This pipe
must not be blocked or altered in any way.
Room thermostat / programmer
A room thermostat / programmer must be fitted to control the central heating. This controls the times and temperatures of the
central heating, preventing the boiler from firing unnecessarily. Refer to the instructions supplied with the thermostat and
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.

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
Worcester, Bosch Group
Cotswold Way, Warndon, Worcester WR4 9SW.
Tel. [phone]
Worcester, Bosch Group is a brand name of
Bosch Thermotechnology Ltd.
worcester-bosch.co.uk
6 720 815 063