Worcester Greenstar i System Compact ErP Series User manual

UK/IE
User instructions
Wall hung RSF gas fired condensing system boiler
Greenstar i System Compact ErP
6720643358-00.1Wo
For central heating systems and indirect mains fed domestic hot water
6 720 813 281 (2014/09)
If you smell gas:
▶ 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.
These appliances are for use with :
Natural Gas or L.P.G.
(Cat. II 2H 3P type C13, C33 & C53)
Model GC Number
Natural Gas 27i System Compact ErP 41-406-58
30i System Compact ErP 41-406-60
L.P.G. 27i System Compact ErP 41-406-59
30i System Compact ErP 41-406-61

2
Preface
Greenstar i System ErP - 6 720 813 281 (2014/09)
Preface
Please read these instructions carefully
These instructions are applicable to the Worcester, Bosch
Group appliance 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 appliance manufactured by Worcester, Bosch
Group. The company prides itself on manufacturing appliances
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 over 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 is
amongst the top energy rated appliances available.
There is also the reassurance of our parts and labour guarantee
- backed up by Worcester Total Cover, an optional complete
maintenance scheme to keep your appliance operating at peak
condition and efficiency.

3
Contents
Greenstar i System ErP - 6 720 813 281 (2014/09)
Contents
1 Key to symbols and safety instructions 4
1.1 Key to symbols 4
1.2 Safety precautions 4
2 General information 5
2.1 Energy efficiency 5
2.2 Servicing 5
2.3 Benchmark standard 5
2.4 User caution 5
3Controls6
3.1 Operating the boiler 8
3.1.1 Boiler display 8
3.1.2 Setting the boiler flow temperature for the
system 8
3.1.3 Turning the central heating off during the
summer 8
3.1.4 Boiler frost protection 9
3.1.5 No Integral diverter valve fitted: Cylinder
temperature adjustment 9
3.1.6 Optional integral diverter valve kit fitted:
Setting the cylinder hot water temperature. 9
3.1.7 Domestic hot water eco and preheat modes
10
3.1.8 Domestic hot water: switching between Eco
and Preheat modes 10
3.1.9 Turn off the Operation/fault diagnostic light
(blue) 10
4SystemPressure11
4.1 Sealed heating systems 11
4.2 External filling loop 12
5 Service Clearances 13
6 Maintaining your appliance 14
7FaultFinding15
7.1 Boiler alert state 16
7.2 Boiler reset 16
7.3 Extreme cold weather 17
8 Fault or Breakdown 18
9 Tips on energy saving 19
10 Environment / disposal 20
11 Your guarantee 20
12 Glossary 21

4
Key to symbols and safety instructions
Greenstar i System ErP - 6 720 813 281 (2014/09)
1 Key to symbols and safety instructions
1.1 Key to symbols
Warnings
The following keywords are defined and can be used in this
document:
•NOTICE indicates a situation that could result indamage to
property or equipment.
•CAUTION indicates a situation that could result in minorto
medium injury.
•WARNING indicates a situation that could result in severe
injury or death.
•DANGER indicates a situation that will result in severe
injury or death.
Important information
Additional symbols
Examples of additional symbols used
A numbered step in an action sequence
A sequence of numbered steps or actions carried out in a
specific order to complete a task.
1. First action
2. Second action
3. Third action
etc.
A step in an action sequence
A sequence of defined actions or steps carried out in order to
complete a task.
▶Action
▶Nextaction
▶etc
A reference to a related part in the document or to other
related documents.
To refer the reader to a specific figure/table/section within the
manual.
e.g. figure 1.
A reference number to identify or refer to a part or item.
In a related figure, items or parts identified by a sequential
number.
List entries, first and second levels
• A single component/item
• A component/list, made up of multiple parts/items.
– Sub component or sublist of main component/list.
–etc.
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.
Appliance 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 the 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.
Safety instructions in this document are
framed and identified by a
warning triangle which is printed on a grey
background.
This symbol indicates important information
where there is no risk to people or property.
Symbol Meaning
1. a numbered step in an action sequence
▶ a step in an action sequence
a reference to a related part in the document or to
other related documents
a reference number to identify or refer to a part or
item
•alistentry
– a list entry (second level)
Table 1
1

5
General information
Greenstar i System ErP - 6 720 813 281 (2014/09)
Combustible and corrosive materials:
Chemically aggressive substances can corrode the appliance
and invalidate any guarantee.
• Do not store or use any combustible materials (paper,
thinners, paints, propellants, cleaning agents etc.) inside
the cupboard containing the appliance or within the vicinity
of the appliance.
Fittings and modifications:
Only a competent engineer can remove the appliance case and
carry out any work, in accordance with the Gas Safety
(Installation and Use) Regulations.
• Do not remove the appliance case.
Any misuse or unauthorised modifications to the appliance,
flue or associated accessories and heating system will
invalidate the guarantee.
• Do not modify the appliance 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 appliance case:
Use a damp, soft cloth to clean the outer painted metal case of
the appliance, do not use chemicals or abrasive materials.
2 General information
2.1 Energy efficiency
Energy efficiency information is given in the Installation,
Commissioning and Servicing Instructions supplied with the
appliance.
2.2 Servicing
• The appliance 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 appliance 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.
2.3 Benchmark standard
The Benchmark initiative is a
code of practice to encourage
the correct installation,
commissioning and servicing of
domestic central heating
appliances and system
equipment.
A “checklist” is dispatched with every appliance 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 appliance has been installed and commissioned
according to the manufacturer's instructions.
The service record provides space for the recording of regular
servicing of the appliance/heating system and this can become
a valuable document when, for example, you wish to sell the
property. The service record 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
2.4 User caution
• It is forbidden for any interference with the appliance other
than those actions allowed in this document.
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.
CAUTION: Incorrect use
▶ Any incorrect use can result in danger to
the householder.

6
Controls
Greenstar i System ErP - 6 720 813 281 (2014/09)
3Controls
▶ To gain access to the boiler controls pull the flap down using the curved flap handle.
Fig. 1 Basic boiler controls
Boiler
Controls
1Service menu/back button 9 Scroll down button
2Service engineer symbol = boiler is set to maximum
or minimum output for service
10 The blue light is ON when the boiler is in an
operational mode.
It will also flash to indicate a fault.
3Eco button*
4Reset button 11 Position for optional programmer
5Boiler display 12 Hot water temperature control*
6Central heating temperature control 13 Diagnostic port**
7Scroll up button
8OK - Select/confirmation button 14 Central heating system pressure gauge
* Requires optional integral diverter kit to be functional ** for Worcester service engineer use only
6720643358-02.1Wo
1 3 65 7 8 9 10 11 12 13 1442

7
Controls
Greenstar i System ErP - 6 720 813 281 (2014/09)
Display symbols
SCREEN DISPLAY BRIEF DESCRIPTION EXPLANATION
All possible screen symbols This screen is displayed briefly during boiler start
up and shows all the symbols that could be
displayed on the screen.
Numerical display Displays a temperature setting or boiler status
code.
Text display Display PreHeat or Eco, or the Alert code
Hot water Displays this symbol during a DHW demand, if the
optional integral diverter valve kit is fitted.
Central Heating Displays this symbol during central heating
demand.
Service engineer mode Displays during service when the boiler is set to
maximum or minimum output.
Alert Displays along with the boiler status code and
diagnostic code during a fault condition.
Service mode Displays when a qualified service engineer is in
the service menus.
Burner on The boiler is in operation and the flame is alight.
Centigrade indication Displays next to the temperature reading.
Confirmation This symbol confirms a manual change.
Maintenance codes A code displayed with an H and a number relates
to a maintenance issue. This is not a boiler fault
but an indication that something will need
attention concerning the boiler.
The example shown is H13 Service interval
reached, the boiler requires servicing.
Call your installer or Worcester Bosch Group to
organise a service visit.
°C
°
F
°C
°C
°F
H 13

8
Controls
Greenstar i System ErP - 6 720 813 281 (2014/09)
3.1 Operating the boiler
3.1.1 Boiler display
This is typical of the display when the boiler is not supplying a heat demand.
The display will not be backlit and the internal temperature of the boiler is indicated.
3.1.2 Setting the boiler flow temperature for the system
1. Turn the central heating temperature control knob to the desired flow temperature between 30 and 82°C, this will be indicated
on the digital display. This is not the room temperature but the flow temperature through the system.
The “e” point provides guidance for the maximum temperature setting for optimum energy efficiency.
2. The radiator symbol will be displayed to confirm that the a heating setting is being changed.
3. The value is displayed during this process, press to exit or after five seconds of inactivity the boiler display will return to
the default screen.
▶ Comfort levels within rooms should be controlled by your thermostatic radiator valves and/or room thermostat.
3.1.3 Turning the central heating off during the summer
▶ Turn your programmer/timer to the off position.
▶ Please refer to the programmer/timer manufacturer's instructions.
max
min
2
3
1
04
bar
1
ok
eco
reset
e
max
min
°C
°F
°C
°F
6720807727-01.1Wo
ok
max
min
2
3
1
04
bar
1
ok
eco
reset
e
max
min
°C
°F
Eco
1.
6720643358-03.1Wo
°C
°F
Eco
2.
3.
Do not switch the appliance off at the mains fused spur.

9
Controls
Greenstar i System ErP - 6 720 813 281 (2014/09)
3.1.4 Boiler frost protection
If you are leaving your property unoccupied during cold weather, please leave your programmer on constant and your room
thermostat set to 15°C.
▶ If the temperature within the boiler falls below 8°C the pump will run to circulate water and prevent the system freezing.
– If the temperature does not rise to 9°C within 30 minutes of the pump operating, the boiler will fire up to provide heat to
bring the temperature up.
▶ If the temperature within the boiler falls below 5°C the boiler will fire immediately, bringing the boiler temperature up to 15°C
to avoid the possibility of the system freezing.
▶ This process will be repeated until such time that the boiler temperature does not drop below 5°C.
3.1.5 No Integral diverter valve fitted: Cylinder temperature adjustment
If a heat demand occurs, the radiator and flame symbols will be displayed
If the domestic hot water control is adjusted or the “eco” button is pressed:
▶ N/A is displayed briefly.
▶ This function will not affect the cylinder hot water temperature.
To adjust the water temperature of the cylinder:
▶ Adjust the cylinder temperature thermostat on the cylinder.
3.1.6 Optional integral diverter valve kit fitted: Setting the cylinder hot water temperature.
1. Turn the hot water temperature control knob to the desired level between 40 and 70°C, this will be shown on the digital display.
Fig. 2 Hot water temperature
▶ The tap symbol will be displayed to confirm that the hot water is being adjusted.
▶ After five seconds the boiler display will return to the default screen.
NOTICE: The boiler must be switched on with a gas supply in order for the built -in auto frost protection to work as
described.
An internal or external timer/programmer coupled with the optional integral diverter valve kit with cylinder
temperature sensor is required to be able to set the hot water temperature.
If an FR110, FW100 and Sense II controller is also fitted, in conjunction with the diverter valve, they assume control
over the delivered temperatures, reducing the effect of the temperature controls. Set both to maximum.
An external timer may be fitted instead of an internal timer.
max
min
2
3
1
04
bar
1
ok
eco
reset
e
max
min
°C
°F
°C
°F
1.
6720807727-03.1Wo

10
Controls
Greenstar i System ErP - 6 720 813 281 (2014/09)
3.1.7 Domestic hot water eco and preheat modes
• Eco mode is an energy saving feature which disables the Preheat function:
– Eco is enabled by default, during the initial appliance start up and “Eco” [2] will be displayed to confirm this state.
– During the ON periods [1] set by the time control, Eco mode will use less energy, because the boiler will maintain a slightly
lower average temperature.
• Preheat mode, the appliance heats the cylinder more frequently. This tops up the cylinder temperature for quicker heat up
times, this is useful for large/longer demand periods during the hot water ON periods, “PreHeat” [3] will be displayed to confirm
this state.
– During the ON periods [1]set by the time control, the cylinder is heated more regularly to reduce the time taken to deliver
hot water.
3.1.8 Domestic hot water: switching between Eco and Preheat modes
1. Press and hold the Eco button for at least four seconds to enter the energy saving Eco mode, when Eco mode is active,
“Eco” will be displayed.
To exit Eco mode and return to PreHeat
2. Press and hold the Eco button for at least four seconds and “PreHeat” will be displayed.
Fig. 3 Switching between Eco & Preheat mode
3.1.9 Turn off the Operation/fault diagnostic light (blue)
You may choose to deactivate the operation/fault diagnostic light. Please ask your installer to set-up this feature.
The light will still flash to alert you to a possible fault, but will not activate during a heat requirement demand for heating or hot water.
6720813281-01.1Wo
°C
°F
Eco
°C
°F
PreHeat
1 1
2 3
ok
ok
6720813281-02.1Wo
max
min
2
3
1
04
bar
1
ok
eco
reset
e
max
min
°C
°F
Eco 1.
°C
°F
Eco
°C
°F
PreHeat

11
System Pressure
Greenstar i System ErP - 6 720 813 281 (2014/09)
4SystemPressure
4.1 Sealed heating systems
This appliance 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.
Fig. 4 Optimum system pressure when your boiler is cold (area A)
▶ Use the external filling loop to re-pressurise your boiler, refer to the following section 4.2.
NOTICE: To comply with the Water Authority regulations you must remove the “filling key” or disconnect the
external filling loop after re-pressurisation.
6720643356-11.1Wo
2
3
1
04
bar
1
A
Min
1 bar
1.5 bar
Max

12
System Pressure
Greenstar i System ErP - 6 720 813 281 (2014/09)
4.2 External filling loop
Once the external filling loop has been located, follow the instructions for re-pressurising the system.
1. Unscrew blanking cap.
2. Attach the hose to the valves, screw on hand-tight.
3. Turn the handle/screwdriver slot through 90° to open the valves.
4. The handle/screwdriver slot will be in-line with the valves
Fig. 5 External filling loop
5. When the pressure reaches between the 1 and 1.5 bar marks (zone A), turn the handle/screwdriver slot back, through 90°, to
close the valve.
6. The handle/screwdriver slot will be at 90° to the valves
7. Remove the hose and replace the blanking caps.
NOTICE: External filling loops
▶ If the filling loop does not look like the one shown in the figure below or you cannot find your filling loop, contact
your installer.
▶ To comply with Water Authority regulations you must disconnect the external filling loop after re-
pressurisation.
If the pressure gauge reads more than 1.5 bar as a result of over filling, bleed one radiator until the pressure gauge
returns to between 1 and 1.5 bar.
2
3
1
04
bar
1
A
Min
1 bar
1.5 bar
Max
6720806947-01.1Wo
1. 2.
7.
4. 4.
3.
3.
6. 6.
5.
5.

13
Service Clearances
Greenstar i System ErP - 6 720 813 281 (2014/09)
5 Service Clearances
Your installer will have provided adequate space around the boiler for safety and servicing access.
Fig. 6 Service clearances
[*] Minimum clearances to removable door
[**] Minimum clearances required for servicing
[***] Height for either 60/100 flue or 80/125 flue
CAUTION: Restricted space.
The boiler may overheat.
▶ Do not restrict this space with the addition of cupboards, shelves etc. next to the boiler.
NOTICE: Combustible and corrosive materials:
Chemically aggressive substances can corrode the appliance and invalidate any guarantee.
▶ Do not store or use any combustible materials (paper, thinners, paints, propellants, cleaning agents etc.)
inside the cupboard containing the appliance or within the vicinity of the appliance.
1060/1100mm***
880mm
300mm
400mm
170/210mm***
600mm**
5mm
5mm
200mm
20mm*
6720646608-122.1Wo

14
Maintaining your appliance
Greenstar i System ErP - 6 720 813 281 (2014/09)
6 Maintaining your appliance
Your new gas-fired appliance represents a long term investment in a reliable, high quality product.
Wipe the appliance 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 appliance receives regular servicing and maintenance checks from a competent person beyond the initial guarantee
period.
If your Greenstar gas-fired appliance should fail to operate correctly or requires servicing, please contact the Worcester, Bosch
Group Appointments Team (see rear cover for details).
Details of the appliance including the Gas Council number can be found on the front cover of these User Instructions and on the
appliance identification label on the appliance facia.
The Gas Council number is also listed on the front cover of your Installation, Commissioning and Servicing Instructions.

15
Fault Finding
Greenstar i System ErP - 6 720 813 281 (2014/09)
7FaultFinding
In the event that the appliance stops functioning or does not perform as expected, please see table below These problems are some
of the most common causes. Should the problem persist or if other fault codes are displayed, then it will be necessary to contact
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
appliance set too low
▶ Increase central heating flow temperature control
setting
Low temperature setting on the room thermostat ▶ Increase setting on the room thermostat.
Air trapped in heating system ▶ Bleed radiators and re-pressurise the heating system
Low system water pressure ▶ Re-pressurise the system, refer to page 12
Desired room
temperature too
high
Thermostatic radiator valves are set to high ▶ Turn down thermostatic radiator valves.
Room thermostat is set too high ▶ Turn down room thermostat.
Radiators are too
hot
Temperature control on appliance set too high ▶ Reduce central heating temperature by turning down
the Central Heating control on appliance.
Note: This could prevent your property reaching the
desired temperature during cold weather periods.
Heating stays on
for too long
Clock is incorrectly set ▶ Check clock setting and adjust
No blue
Operation/Fault
Indicator
Momentary power failure ▶ Disconnect boiler supply, wait a few seconds then
reconnect.
Energy saving feature is activated ▶ Ask your installer to reset the blue light
Hot water
temperature too
low
Temperature set too low:
• Cylinder thermostat control.
• Appliance hot water control (this feature is
only available if the option integral diverter
valve has been fitted)
▶ Check setting and adjust
Air trapped in heating system ▶ Bleed radiators and re-pressurise the heating system
Low system water pressure ▶ Re-pressurise the system, refer to page 12
Hot water
temperature too
high
Temperature set too high:
• Cylinder thermostat control.
• Appliance hot water control (this feature is
only available if the option integral diverter
valve has been fitted)
▶ Check setting and adjust
Table 2 Fault finding

16
Fault Finding
Greenstar i System ErP - 6 720 813 281 (2014/09)
7.1 Boiler alert state
In the event of an alert, a fault code and an alert symbol will be displayed on the boiler display, and the blue operation/fault
light will flash, e.g. EA, reset your boiler.
7.2 Boiler reset
1. To reset the boiler, press .
2. “Reset” and are briefly displayed.
▶ If the reset was successful the boiler will return to normal operation.
▶ If the reset was not successful then the alert code will be displayed again, and the blue operation/fault light will continue to flash.
Due to the internal safety systems of your Greenstar CDi Compact boiler, some codes cannot be cleared by a simple reset. Please
contact Worcester, Bosch Group for further assistance.
When calling Worcester, Bosch Group about a fault, it will be useful to quote the alert code and three digit number under the alert
code, e.g. EA and 227. If there is a fault that cannot be reset by you, the user, then a service engineer visit will be necessary.
max
min
2
3
1
04
bar
1
ok
eco
reset
e
max
min
°C
°F
227
°C
°F
227
6720643358-14.1Wo
reset
max
min
2
3
1
04
bar
1
ok
eco
reset
e
max
min
°C
°F
Reset
6720643358-09.2Wo
°C
°F
Reset
1.
2.

17
Fault Finding
Greenstar i System ErP - 6 720 813 281 (2014/09)
7.3 Extreme cold weather
In certain 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. Worcester, Bosch Group have available on our website helpful
videos in the Customer service section.
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.
▶Thawthefrozenpipe.
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. Care must be taken at
pedestrian areas where this water may freeze and create a slip hazard.
▶ Worcester, Bosch Group have available on our website helpful videos in the Customer service section to aid in thawing a frozen
pipe.
▶ 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 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!

18
Fault or Breakdown
Greenstar i System ErP - 6 720 813 281 (2014/09)
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 appliance has been installed within the last 24 months. Reasonable evidence of this must be
supplied on request. i.e. the Benchmark Checklist.
• A call-out charge will be made where:
– The boiler has been installed for over 24 months.
– 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; under normal circumstances this will be from 1 - 3
working days (excluding weekends) for priority breakdown situations (no hot water and/or heating).
Invoices for attendance and repair work carried out on this boiler by any third party will not be accepted.
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.

19
Tips on energy saving
Greenstar i System ErP - 6 720 813 281 (2014/09)
9 Tips on energy saving
Heating economically
The appliance provides a high level of comfort whilst keeping gas consumption low and so minimising the environmental impact.
The gas supply to the appliance‘s burner is regulated according to the demand for heat. The appliance 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 appliance may stay on for relatively long periods of time but will use less gas than a appliance 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 appliance
as described on section 3.1.2, Setting the boiler flow temperature for the system. 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 manuallyadjust all thermostatic radiator valvesevery 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 appliance operates safely.

20
Environment / disposal
Greenstar i System ErP - 6 720 813 281 (2014/09)
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 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 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 2552.
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% recycleable.
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 3