Bosch Worcester Greenstar Utility ErP+ 32/50 User manual

UK
User Instructions
Floor standing oil fired condensing boiler conventional flue and room sealed flue
Greenstar Utility ErP+ 32/50 & 50/70
6720821750-00.1Wo
For fully pumped open vent and sealed central heating systems and domestic hot water cylinders.
For use with Kerosene (Class C2) only.
6 720 821 750 (2018/04) UK

2
Preface
Greenstar Utility ErP – 6 720 821 750 (2018/04)
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 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 oil-fired condensing
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 among 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.
Contents
1 Key to symbols and safety instructions - - 3
1.1 Key to symbols - - - - - - - - - - - - - - - - - - 3
1.2 Safety instructions - - - - - - - - - - - - - - - 3
2 General Information - - - - - - - - - - - - - - - - - - - 4
2.1 Appliance identification and serial
number - - - - - - - - - - - - - - - - - - - - - - - -4
2.2 Energy efficiency - - - - - - - - - - - - - - - - 5
2.3 Servicing - - - - - - - - - - - - - - - - - - - - - - - 5
2.4 Maintaining your appliance - - - - - - - - 5
2.5 User caution - - - - - - - - - - - - - - - - - - - - 6
3 Using your boiler - - - - - - - - - - - - - - - - - - - - - - 6
3.1 Accessing the controls - - - - - - - - - - - - 6
3.2 Operating the boiler - - - - - - - - - - - - - - 6
3.2.1 Switching the boiler on/off - - - - - - - - 6
3.2.2 Setting temperature - - - - - - - - - - - - - - 6
3.2.3 Controlling central heating - - - - - - - - - 7
3.2.4 Frost protection - - - - - - - - - - - - - - - - - 7
4 Prepare for operation - - - - - - - - - - - - - - - - - 7
4.1 Open vented heating systems - - - - - - 7
4.2 Sealed heating systems - - - - - - - - - - - 7
4.2.1 Checking the system pressure - - - - - - 7
4.2.2 Constantly re-pressuring the system
pressure - - - - - - - - - - - - - - - - - - - - - - -7
4.3 Topping up the system pressure - - - - 8
5 General information - - - - - - - - - - - - - - - - - - - 9
5.1 Clearances information - - - - - - - - - - - 9
5.2 Ventilation information - - - - - - - - - - - 9
5.3 General notes - - - - - - - - - - - - - - - - - -10
5.3.1 Central heating systems - - - - - - - - - -10
5.3.2 Pluming and condensate drain - - - - -10
6 Malfunction or failure - - - - - - - - - - - - - - - - 11
6.1 Fault finding - - - - - - - - - - - - - - - - - - 12
6.2 Controls behind the front panel - - - 13
6.3 Persistent failure - - - - - - - - - - - - - - - 13
7 Energy saving - - - - - - - - - - - - - - - - - - - - - - - 14
7.1 Tips on energy saving - - - - - - - - - - - 14
8 Environment/disposal - - - - - - - - - - - - - - - - 15
9 Your guarantee - - - - - - - - - - - - - - - - - - - - - - 15
9.1 Guarantee registration - - - - - - - - - - 15

3
Key to symbols and safety instructions
Greenstar Utility ErP – 6 720 821 750 (2018/04)
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 resultin damage to
property or equipment.
•CAUTION indicates a situation that could result in minor to
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 instructions
These operating instructions are intended for the user of the
heating system.
▶ Read any operating instructions (boiler, heating controls,
etc.) carefully before operation and keep them.
▶ Observe the safety instructions and warnings.
Oil fumes or leaks from the appliance
If you smell oil fumes, observe the following rules.
▶Extinguishanynakedflames
▶ Isolate the electrical supply
▶ Isolate the fuel supply to the boiler
▶ Open windows and doors
▶ Rectify the fault
Health and safety
The appliance contains no asbestos and no substances have
been used in the construction process that contravene the
COSHH Regulations (Control of Substances Hazardous to
Health Regulations 1998). Where applicable, the CE mark
indicates compliance with relative EU Directives.
Combustion air/room air
The air in the installation room must be free of combustible or
chemically aggressive substances.
▶ Do not use or store combustible or explosive materials
(paper, propellants, thinners, paints, etc.) within the
vicinity of the appliance.
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

4
General Information
Greenstar Utility ErP – 6 720 821 750 (2018/04)
Safety of electrical devices for
domestic use and similar purposes:
The following requirements apply in
accordancewith EN 60335-1 in order to
prevent hazards from occurring when
using electrical appliances:
“This appliance can be used by children
of 8 years and older, as well as by people
with reduced physical, sensory or
mental capabilities or lacking in
experience and knowledge, if they are
supervised and have been given
instruction in the safe use of the
appliance and understand the resulting
dangers. Children shall not play with the
appliance. Cleaning and user
maintenance must not be performed by
children without supervision.”
“If the power cable is damaged, it must
be replaced by the manufacturer, its
customer service department or a
similarly qualified person, so that risks
are avoided.”
Intended use
This appliance must only be used as a heat appliance in an open
vented or sealed hot water heating system for domestic
purposes.
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.
2 General Information
2.1 Appliance identification and serial number
The data label can be found on the inside of the boiler on the
condensate trap bracket, refer to the figure below.
To access data label
Remove the front panel:
▶ To remove the front panel pull panel squarely away from
the front of the boiler.
▶ To replace, realign ball studs and push back into place.
Fig. 1
For your own records
Please ensure that the Commissioning Checklist has been
completed by your installer or service engineer.
The appliance model and serial number can be found on the
appliance data label.
Model:
Serial number:
Date of installation:
Table 2 Appliance details
Data
label
6720821750-03.1Wo

5
General Information
Greenstar Utility ErP – 6 720 821 750 (2018/04)
2.2 Energy efficiency
Energy efficiency information is given in the Installation,
Commissioning and Servicing Instructions supplied with the
appliance.
2.3 Servicing
The Service Checklist can be found at the rear of the boiler’s
installation instructions. It will be required in the event of any
guarantee work and may be required by the local Building
Control Inspector.
▶ The appliance should be serviced annually by a competent,
qualified person, such as a Worcester service engineer or
other OFTEC registered engineer, unless the installation
conditions and usage demand more frequent services.
▶ Ensure that the service engineer completes the Service
Record, at the rear of the Installation, Commissioning and
Servicing Instruction manual, after each service.
▶ Have any work carried out by a competent, qualified
person, Worcester service engineer or other OFTEC
registered engineer.
▶ Always use original spares, to help maintain the efficiency,
safety and reliability of the appliance.
2.4 Maintaining your appliance
Your new 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 servicing and maintenance checks are performed
at least once a year by an OFTEC engineer or other suitably
qualified person.
If you would like to know more about servicing options from
Worcester, Bosch Group, please visit worcester-bosch.co.uk.
Please tick the appropriate box on your warranty registration
card for further details of the Worcester, Bosch Group Service
Contract.
When your appliance requires servicing please contact a
Worcester, Bosch Group contact centre (see rear cover,
appointments).
In addition to the service contract we are pleased to offer a one-
off annual service or breakdown call out for your appliance.
Maintenance tips
• Regularly check the oil level in the oil storage tank.
• Regularly check the water pressure.
• Do not obstruct the flue outlet or the air inlet.
• Use in hard water areas:
– In exceptionally hard water areas a device to prevent
scale formation may be fitted. Installation of a scale
inhibitor assembly should be in accordance with the
requirements of the local water company. An isolating
valve should be fitted to allow for servicing.
Ensure that the service engineer completes
the Service Record after each service.
Important note:
▶Ifyouhavetoaddwater regularly in your
heating system, call a qualified
professional.

6
Using your boiler
Greenstar Utility ErP – 6 720 821 750 (2018/04)
2.5 User caution
• It is forbidden for any interference with the appliance other
than those actions allowed in this document.
3Usingyourboiler
3.1 Accessing the controls
Remove the front panel:
▶ To remove the front panel pull panel squarely away from
the front of the boiler.
▶ To replace, realign ball studs and push back into place.
Fig. 2
[A] Temperature control
[B] Reset button - flue overheat thermostat
[C] Reset button - boiler overheat thermostat
[D] Burner reset
3.2 Operating the boiler
3.2.1 Switching the boiler on/off
▶ To switch on the boiler; turn on the oil and electricity supply
to the boiler.
▶ Check the programmer/timer is correct and is set to ON.
▶ Set the room thermostat to the desired setting.
▶ Open and set thermostatic radiator valves as required.
▶ Turn the boiler water temperature control to the required
setting.
▶ To switch off the boiler; turn the programmer/timer to OFF
for heating and hot water.
If the boiler is left unused and exposed to freezing conditions;
shut off all the mains supplies, isolate the boiler and drain the
system and boiler.
3.2.2 Setting temperature
▶ Turn the control clockwise to increase the water
temperature.
▶ Turn the control anti-clockwise to reduce the water
temperature.
The minimum and maximum ranges of the temperature control
positions are approximately 60 to 82°C.
Fig. 3
CAUTION: Incorrect use
▶ Any incorrect use can result in danger to
the householder.
6720821750-01.1Wo
6 720 813 330-03.1TL

7
Prepare for operation
Greenstar Utility ErP – 6 720 821 750 (2018/04)
3.2.3 Controlling central heating
▶ Set the programmer/timer to the correct time with the
required ON/OFF periods.
▶ Turn the room thermostat to the temperature required.
▶ Set the thermostatic radiator valves to achieve the
required temperature for each room.
3.2.4 Frost protection
▶ Frost thermostats can be wired into the boiler.
▶ Frost protection should be fitted to the system where the
system is most exposed and at risk of freezing.
If there is no hot water or heating, check page 11 for fault
condition guidance.
4 Prepare for operation
4.1 Open vented heating systems
This appliance can be fitted to an open vented heating system.
Appliances that can be connected to open vented heating
systems will have the pressure maintained automatically by the
header tank feeding the system.
4.2 Sealed heating systems
This appliance can be fitted to a sealed heating system which is
pressurised. Appliances that can be connected to sealed
heating systems are pre-pressurised before operation, this
pressure must be maintained for safe use of the appliance.
Your installer will have fitted a pressure gauge and filling loop
so that the system can be monitored and adjusted as
necessary.
▶ Check regularly that the pressure is maintained.
▶ Re-charge the system if the pressure gauge reads less than
1 bar.
▶ If a permanent significant decrease or increase in pressure
is indicated on the pressure gauge, contact your installer or
maintenance engineer.
4.2.1 Checking the system pressure
Your installer will advise you of the optimum operating
pressure.
▶ Check the system pressure from the pressure gauge.
–Static pressure is when appliance is cold and has not
fired for heating or hot water. This will generally be 1 -
1.5 bar.
–Operating pressure is when the appliance is firing for
a heating or hot water demand. This will generally be 1
- 2 bar.
▶ Top up the heating water, if the pressure is too low.
Fig. 4 Pressure gauge for checking the operating pressure
[1] Static pressure range
[2] Operating pressure range
4.2.2 Constantly re-pressuring the system pressure
Constantly having to re-pressuring the heating system should
be investigated as the concentration of inhibitor protection in
the system will be reduced; this can result in corrosion within
the heating system reducing the efficiency and increasing
contaminates.
▶ Check for leaks on heating system (pipe work and radiator
valves).
▶ Contact your installer or maintenance engineer if a
permanent significant decrease or increase in pressure is
indicated on the pressure gauge.
6720821669-01.1Wo
1
2
Min
Max

8
Prepare for operation
Greenstar Utility ErP – 6 720 821 750 (2018/04)
4.3 Topping up the system pressure
External filling loop
Once the external filling loop and pressure gauge has been located, follow the instructions for re-pressurising the system.
▶ Unscrew the blanking cap [1].
▶ Attach the hose [2] to the valve.
– Usually one end of the hose is already connected to one of the system fill isolation valves.
▶ Ensure both ends [3] of the hose are screwed on hand tight.
▶ Monitor the pressure gauge.
– The system fill isolation valves [4] are in a closed position (the handle/screwdriver slot is across the valve).
▶ Turn the handle/screwdriver slot through 90° to open valves and slowly fill the system.
– The system fill isolation valves [5] are opened (the handle/screwdriver slot is in-line with the valve).
– The needle on the pressure gauge will start to rise.
▶ Set the pressure between 1 and 1.5 bar pressure.
▶ Turn the handles/screwdriver slots back, through 90°, to close the valves.
– The system fill isolation valves [6] are in a closed position (the handle/screwdriver slot is across the valve).
If the pressure drops off, below 1 bar as a result of the air bleeding:
▶ Top up the system pressure.
Once the pressure has settled between 1 and 1.5 bar.
▶ Remove the hose [2] and replace the blanking cap [1].
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.
NOTICE: System fill method
Your installer should have informed you where to find the filling system and instructed you in its use.
▶ To comply with the Water Authority regulations you must disconnect the external filling loop after re-
pressurisation.
6720821669-02.1Wo
1
2
3
4
5
6
Min
1 bar
1.5 bar
Max

9
General information
Greenstar Utility ErP – 6 720 821 750 (2018/04)
5 General information
5.1 Clearances information
Your installer will have provided adequate space around the
appliance for operation, safety and servicing/maintenance
access.
• The following detail the necessary clearance around the
appliance for service and maintenance.
Fig. 5 Appliance clearances
5.2 Ventilation information
The air supply must not be restricted or contaminated.
Conventional flued boilers
Conventional flue boilers require an adequate supply of fresh
air which must be delivered to the boiler for combustion
purposes through a permanent inlet, such as an air brick, into
the area where the boiler is situated.
If a cupboard or compartment which is to be used for storage or
airing is built around the boiler after installation there must be
a non-combustible partition around the boiler. Further
information can be found in BS 5410 which also describes
venting requirements.
Minimum area of air inlet for combustion:
• 248cm2 for 32/50kW appliances
• 358cm2 for 50/70kW appliances
Minimum air vent area (cm2) for boilers installed in a
compartment
CAUTION: Risk of damage to appliance or
property!
The appliance will overheat if the clearance
space around the appliance is restricted by
objects.
▶ Do not restrict this space with the
addition of cupboards, shelves etc. next
to or around the appliance.
▶ Do not store any combustible materials
on or next to the appliance, such as
clothes, towels, paper or plastic bags.
Clearance Dimensions (mm)
1 Overall height 1,398
2 Overall depth 1,395
3Overallwidth 618
4Above 300
5Front 600
6Side 10
Table 3 Appliance service clearances
6720821751-01.1Wo
Ventilation considerations
▶ Do not place objects to hinder the air
circulation required by the appliance.
▶ The installation premises may require
ventilation to be fitted according to its
features or use.
Conventional flue
kW Internal ventilation1)
1) Internal air to and from a space/room inside the building.
External ventilation2)
2) External air to and from directly outside the building.
High Level Low Level High Level Low Level
32/50 550 825 275 550
50/70 770 1155 385 770
Table 4
Room Sealed flue
kW Internal ventilation1) External ventilation2)
High Level Low Level High Level Low Level
32/50 550 550 275 275
50/70 770 770 385 385
Table 5

10
General information
Greenstar Utility ErP – 6 720 821 750 (2018/04)
Venting compartments
▶ Ventilation must be provided for boilers fitted into
compartments as described in BS 5410
▶ A minimum of two air vents must be fitted, one at low level
and another at high level onto the same wall using the same
air for circulation.
▶ Combustion air must not be taken from a room or internal
space containing a bath or shower and must not
communicate with a protected area such as a hall, stairway,
landing, corridor, lobby, shaft etc.
▶ Air vents must allow access for clean free air and must be
sited to comply with the flue terminal position
requirements.
▶ Air duct runs must not exceed 3m.
▶ Low level air vents must be less than 450mm from the
floor.
▶ A warning label must be attached to the vents with a
statement to the effect:
"Do not block this vent. Do not use for storage".
5.3 General notes
To get the best from your appliance. please read these
instructions carefully.
5.3.1 Central heating systems
During the first few hours of operation of the central heating
system, check that all radiators are being heated at an even
rate. If the top of a radiator is at a lower temperature than the
bottom then it should be vented by releasing air through the
venting screw at the top of the radiator. Ask your installer to
show you how this is done. Repeated venting will reduce the
quantity of water in the system and this must be replenished for
safe and satisfactory operation of the boiler.
When excessive venting or water leaks are found in the system
you must contact a service engineer to inspect the installation
and rectify any fault.
Only use additives compatible with the boiler and system. Use
of incompatible additives can cause damage and will invalidate
the boiler guarantee.
5.3.2 Pluming and condensate drain
This is a condensing appliance and the terminal will, at times
give out a plume of water vapour. This is quite normal.
The appliance also produces quantities of condensate which is
discharged regularly via a pipe to a disposal point.
This pipe must not be blocked or altered in any way.

11
Malfunction or failure
Greenstar Utility ErP – 6 720 821 750 (2018/04)
6 Malfunction or failure
If you believe there is a problem with your central heating or hot
water supply, in the first instance it is advised to carry out the
following basic checks before you contact your installer/
maintenance engineer and report the error and appliance type.
• Is the electrical power switched on to the appliance?
• Is the programmer/timer set to ON or in an ON period (if
installed)?
• Is the room thermostat (if fitted) set too high/low?
• Is the domestic hot water thermostat set too high/low?
• Is the cold water main turned on?
• Sealed heating system:
– Is the static system pressure (when appliance is cold)
between 1 - 1.5 bar?
• Is there sufficient oil in the oil storage tank?
Details of your installer should be available in the
Commissioning Checklist or can be recorded in the following
section.
Installer/maintenance engineer
Worcester, Bosch Group
The appliance is supported in the UK and Eire by Worcester,
Bosch Group.
Specialist service engineers are available to attend an
appliance breakdown.
• No charge will be made for parts and/or labour providing:
– The appliance fault is found and the appliance is within
the guarantee period. Reasonable evidence of this
must be supplied on request. i.e. a completed
Commissioning and service record and has been
regularly serviced.
• A call-out charge will be made where:
– The appliance is outside the guarantee period or has
not been serviced in accordance with the
manufacturers instructions.
– Our Field Service Engineer finds no fault with the
appliance.
– The cause of breakdown is misuse or with other parts of
your plumbing/heating system, or with equipment not
supplied by Worcester, Bosch Group.
In the event of a appliance 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 and bank
holidays) for priority breakdown situations (no hot water and/
or heating).
Installer/maintenance engineer details
Engineer
name:
Company
name:
Company
address:
Telephone:
Email:
Table 6
Invoices for attendance and repair work
carried out on this appliance by any third
party will not be accepted.
No appliance fault is found on over 30% of all
service calls.
▶ In the case of a suspected fault, refer to
the basic checks earlier in this section.

12
Malfunction or failure
Greenstar Utility ErP – 6 720 821 750 (2018/04)
6.1 Fault finding
Problem Cause Remedy
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
Low temperature setting on the room thermostat ▶ Increase settings on room thermostat
Radiators are too hot Temperature control for central heating flow on
appliance set too high
▶ Reduce central heating temperature by turning
down the Central Heating control (item [A],
figure 6) on appliance.
Note: This could prevent your property reaching
the desired temperature during cold weather
periods.
Desired room
temperature is too
high
Thermostatic radiator valve(s) are set too high ▶ Turn down thermostatic radiator valves/room
thermostat
Room thermostat is set too high ▶ Reduce central heating temperature by turning
down the Central Heating control on boiler
Heating stays on for
too long
Clock is incorrectly set ▶Checksettingandadjust
Hot water
temperature too low
Temperature set too low on cylinder thermostat
control.
▶Checksettingandadjust
Hot water
temperature too high
Temperature set too high on cylinder thermostat
control.
▶Checksettingandadjust
System pressure low
(appliance on a
sealed system)
Leak within the heating system ▶ Check system for obvious leaks.
Table 7 Fault finding

13
Malfunction or failure
Greenstar Utility ErP – 6 720 821 750 (2018/04)
6.2 Controls behind the front panel
Temperature control [A]
▶ Remove the front panel and check the thermostat control
knob [A] is turned on.
– To remove the front panel pull the panel squarely away
from the front of the boiler.
– To replace, realign ball studs and push back into place.
Reset buttons [B, C & D]
▶ Remove the front panel and locate the reset button.
– To remove the front panel pull the panel squarely away
from the front of the boiler.
– To replace, realign ball studs and push back into place.
Always keep pressure to the edges of the panels to avoid
accidental damage.
Fig. 6 Controls behind the front panel
[A] Temperature control
[B] Reset button - Flue overheat thermostat
[C] Reset button - Appliance overheat thermostat
[D] Reset button - Burner lockout
Appliance reset buttons
Automatic reset
▶ An excessive appliance operating temperature can activate
a thermostat to switch off the appliance. This thermostat
automatically resets when the appliance has cooled down
sufficiently.
Do not attempt to repeatedly start the appliance using the
manual reset buttons as persistent failure indicates a fault
requiring the attention of a service engineer.
Flue overheat [B] (manual reset)
▶ Excessive combustion gas temperatures can activate a
thermostat to switch off the appliance, indicated by button
standing proud. Press and release to reset thermostat.
Appliance overheat [C] (manual reset)
▶ Should the appliance temperature rise beyond the
automatic reset level, a high limit thermostat will switch the
appliance off, indicated by button standing proud. When
the appliance has cooled down, press and release to reset
the thermostat.
Burner lockout [D] (manual reset)
▶ Flame failure, for any reason, will cause the burner to go
safely to a lockout condition.
▶ Remove the appliance front panel and check the lockout
button. If this is illuminated it indicates a "lockout"
condition. To cancel lockout, wait 2 minutes, then press
and release the button.
6.3 Persistent failure
If the appliance fails to operate after following the previous
checks from the “Malfunction or failure” chapter 6, then a
safety device in the appliance control system may have been
activated to prevent the appliance from operating.
6720821750-01.1Wo

14
Energy saving
Greenstar Utility ErP – 6 720 821 750 (2018/04)
7 Energy saving
7.1 Tips on energy saving
Room thermostats
Reducing the setting of the room thermostat by 1°C can reduce
fuel consumption by up to 10%.
New control systems
Upgrade your heating control system with the latest equipment
available. The minimum level of control for a heating system is
a programmer, interlocking room thermostat and thermostatic
radiator valves.
Radiators
More often than not radiators will be sited underneath a
window, so the warm air from the radiator heats the colder
incoming air from the window.
The performance of the radiator will be affected if the curtains
are allowed to drape over the radiator or shelves are fitted
above it.
The positioning of furniture and tables in front of the radiator
should also be avoided.
It is advisable to manually adjust all radiator valves every 2-3
months to prevent them from sticking. It is also important that
the plastic tops of all valves are always in position and not
cracked or damaged to help prevent accidents. Care should be
taken when vacuum cleaning carpets to avoid damage to valves
and pipework.
The heating system and the outputs of the radiators have been
carefully selected by your installer. The temperature
obtainable in any given room is dependent on all radiators
being operated at the same time. If you decide to turn off
radiators in unused rooms, spare bedrooms etc., you may
experience slightly lower room temperatures in rooms adjacent
to unheated rooms.
Heating economically
The appliance is designed to provide a high level of comfort
while keeping oil consumption and the resulting environmental
effect as low as possible.
The central heating control on the appliance should be set as
low as possible while still maintaining a comfortable room
temperature.
The temperature of each room can be set individually using the
thermostatic radiator valves (except theprimary room with the
room thermostat).
Roof insulation
Around 30% of the heat loss from a property is through the
roof. Replace any old insulation with new insulation, preferably
to a minimum thickness of 200mm.
Window frames
Single glazed windows, particularly those with steel frames,
can lose a great deal of heat.
Consideration should be given to replacement with PVCu or
wooden framed double glazed units.
Curtains
Lined curtains, or heavier full length curtains can provide
excellent insulation. However, always ensure that the curtains
do not drape over radiators.
Draughts
Try to ensure that draughts around doors, windows, letter
boxes and keyholes etc. are reduced by using a suitable
draught excluder.

15
Environment/disposal
Greenstar Utility ErP – 6 720 821 750 (2018/04)
8 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.
9 Your guarantee
This appliance has a guarantee against faulty materials or
workmanship from the date of installation subject to the
following terms and conditions:
• During the period of this guarantee any components of the
appliance that 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 appliance was correctly
commissioned and, where appropriate, serviced to the
satisfaction of Bosch Thermotechnology Ltd. These should
be documented in the commissioning and service records
in the Installation, Commissioning and Servicing
Instructions.
•BoschThermotechnologyLtdwill not accept responsibility
for damage caused by faulty installation, neglect, misuse or
accidental damage and non-observance of the instructions
contained in the Installation and Users Instructions
manuals.
• The appliance has been used only for the normal domestic
purposes for which it was designed.
• This guarantee applies only to equipment purchased and
installed in mainland UK.
This guarantee does not affect your statutory rights.
9.1 Guarantee registration
Your appliance carries a guarantee against faulty material or
manufacture subject to Terms and Conditions.
Guarantee Registration can be completed:
•On-line:
– You can register on our website:
www.worcester-bosch.co.uk/guarantee
•Byphone:
– You can register by ringing 0330 123 2552.
•Bypost:
–Pleasesendyourcompleted form to:
Worcester, Bosch Group, Cotswold Way,
Warndon,Worcester,WR4 9SW.
To read full terms & Conditions please visit us on-line at
www.worcester-bosch.co.uk/guarantee.
Your statutory rights are not affected by the manufacturer’s
guarantee.

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
6 720 821 750 (2018/04)
General checks before calling a Service engi-
neer
Check the:
1. Oil level in the tank?
2. Power to the boiler?
3. Control settings?
Please read the fault section of the manual
before contacting our service team.
No boiler fault is found on over 30%
of all service call outs.