Worcester GREENSTAR CDi CLASSIC 29CDi GC User manual

UK/IE
USER INSTRUCTIONS
WALL HUNG RSF GAS FIRED CONDENSING COMBINATION BOILER
GREENSTAR CDi CLASSIC
FOR SEALED CENTRAL HEATING SYSTEMS AND MAINS FED DOMESTIC HOT WATER
6 720 803 600 (2012/06)
The appliances are for use with:
Natural Gas or L.P.G. (Catt II type C13 & C33)
Natural Gas: 29CDi GC number 47-406-34
34CDi GC number 47-406-36
38CDi GC number 47-406-38
42CDi GC number 47-406-10
L.P.G.: 29CDi GC number 47-406-35
34CDi GC number 47-406-37
38CDi GC number 47-406-39
42CDi GC number 47-406-11

2
PREFACE
6 720 803 600 (2012/06)
PREFACE
PLEASE READ THESE INSTRUCTIONS CAREFULLY
These instructions are applicable to the Worcester, Bosch Group boiler model stated on the front cover only.
These instructions apply in the UK/IE only and must be followed except for any statutory obligation.
After installation please leave this User Instruction manual and the Installation, Commissioning and Servicing Instructions 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 almost 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 Band A, 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.
TABLE OF CONTENTS
1 Symbols and safety precautions . . . . . . . . . . . . . . . . . 4
1.1 Explanation of symbols . . . . . . . . . . . . . . . . . . . . . 4
1.2 Safety precautions . . . . . . . . . . . . . . . . . . . . . . . . 5
2General Information . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
3 Operating the boiler . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
3.1 Controls . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
3.2 Switching the boiler on/off . . . . . . . . . . . . . . . . . . 8
3.3 Setting the central heating temperature . . . . . . . 9
3.3.1Controlling the central heating . . . . . . . . . . . . . . . 9
3.4 Setting the domestic hot water temperature . . . 10
3.5 Frost protection (for the boiler) . . . . . . . . . . . . . 11
3.5.1Frost protection (for the heating system) . . . . . 11
3.6 Domestic hot water pre-heat . . . . . . . . . . . . . . . 12
3.7 Holiday setting . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
3.8 Fault condition . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
4Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
4.1 Re-Pressuring the heating system . . . . . . . . . . . 14
4.2 Fault finding . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
4.3 Error codes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
4.4 Extreme cold weather . . . . . . . . . . . . . . . . . . . . . 18
5General notes. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
6Fault or Breakdown. . . . . . . . . . . . . . . . . . . . . . . . . . . 20
7Tips on energy saving. . . . . . . . . . . . . . . . . . . . . . . . . 21
8 Your guarantee . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
9Glossary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

3
SYMBOLS AND SAFETY PRECAUTIONS
6 720 803 600 (2012/06)
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!
•Call the National Gas Emergency Service on: 0800 111 999
•Extinguish any naked flames
•Do not smoke or strike matches
•Do not turn electrical switches on or off
•Open doors and windows
•Keep people away from the affected area
•Turn off the gas control valve at the meter
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 or 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.
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
Ba 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)
Table 1 Symbols
1

4
GENERAL INFORMATION
6 720 803 600 (2012/06)
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.
2 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. 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
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
OPERATING THE BOILER
6 720 803 600 (2012/06)
3 OPERATING THE BOILER
3.1 CONTROLS
[A] MAIN POWER ON/OFF BUTTON
[B] COVER OR POSITION FOR OPTIONAL PLUG-IN CONTROLLER
[C] DISPLAY
[D] SYSTEM PRESSURE GAUGE
[E] RESET BUTTON
[F] ECO BUTTON (DOMESTIC HOT WATER PRE-HEAT ON/OFF)
[G] HOLIDAY BUTTON
[H] DOMESTIC HOT WATER TEMPERATURE CONTROL
[I] CENTRAL HEATING TEMPERATURE CONTROL
[J] SERVICE ENGINEER BUTTON ONLY
[K] SERVICE ENGINEER BUTTON ONLY
[L] BURNER INDICATOR LIGHT
[M] POWER INDICATOR & FAULT INDICATOR (BLUE)
1
2
34
5
6
max
2
3
1
04
bar
1
reset
eco
1
2
34
e
6
maxmin
A
J
B
K
C
LD
M
E
F
G
H
I6720647361-71.1Wo

6
OPERATING THE BOILER
6 720 803 600 (2012/06)
3.2 SWITCHING THE BOILER ON/OFF
Switching on
BSwitch on the boiler by pressing the main power button.
The power button light shows blue.
Switching off
BSwitch off the boiler by pressing the main power button.
The blue power button light goes out.
3.3 SETTING THE CENTRAL HEATING TEMPERATURE
BTurn the central heating temperature control to the desired level, between approx. 35°C and 90°C.
BWhen the burner is lit, the green indicator light underneath the
on/off switch is illuminated.
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.
Position Central heating
temperature
1approx. 35°C
2approx. 43°C
3approx. 50°C
4approx. 60°C
5approx. 67°C
6approx. 75°C
max approx. 90°C
Table 2 Settings for the central heating temperature
reset
eco
max
1
2
34
5
6
max
1
2
34
e
6
6 720 614 059-20.1Wo
6 720 614 059-02.1Wo
eco
reset
max
1
2
34
e
6
max
1
2
34
5
6
min

7
OPERATING THE BOILER
6 720 803 600 (2012/06)
3.3.1 CONTROLLING THE CENTRAL HEATING
Central heating systems must be controlled effectively using a programmer or timer and a room thermostat.
BFor 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.
3.4 SETTING THE DOMESTIC HOT WATER TEMPERATURE
BTurn the domestic hot water temperature control to the desired level, between approximately 40°Cand 60°C.
3.5 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:
BLeave master switch on.
BTurn the central heating control temperature control to .
3.5.1 FROST PROTECTION (FOR THE HEATING SYSTEM)
If remote pipework is likely to be subject to freezing conditions:
BEnsure the installer has fitted a frost thermostat in the area to
protect the pipework from freezing.
BEnsure the installer has added a suitable anti-freeze fluid to the water in the central heating system.
Position Domestic hot water
temperature
min approx. 40°C
eapprox. 50°C
max approx. 60°C
Table 3 Settings for the domestic hot water temperature
eco
reset
max
1
2
34
5
6
max
1
2
34
e
6
6 720 614 059-03.1Wo
eco
reset
max
1
2
34
e
6
max
1
2
3
5
6
min
6 720 614 059-04.1W
o

8
OPERATING THE BOILER
6 720 803 600 (2012/06)
3.6 DOMESTIC HOT WATER PRE-HEAT
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.
To activate pre-heat mode:
BPress the ECO button until it is no longer illuminated.
To activate ECO mode:
BPress the ECO button until it is illuminated.
3.7 HOLIDAY SETTING
Activating the holiday setting will turn off the central heating system.
Frost protection and heating of domestic hot water will stay activated.
To activate the holiday setting:
BPress the holiday button until it is illuminated.
To deactivate the holiday setting:
BPress the holiday button until it is no longer illuminated.
eco
reset
max
1
2
34
5
6
max
1
2
34
e
6
6 720 614 059-06.1Wo
eco
reset
max
1
2
34
5
6
max
1
2
34
e
6
6 720 614 059-05.1Wo

9
OPERATING THE BOILER
6 720 803 600 (2012/06)
3.8 FAULT CONDITION
In the unlikely event of a fault occuring 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:
BPress 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.
If the fault cannot be cleared by pressing the reset button:
BRefer to the fault finding section on page 12 of this user guide.
BCall 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.
reset
eco
max
1
2
34
5
6
max
1
2
34
e
6
6 720 614 059-07.1Wo

10
MAINTENANCE
6 720 803 600 (2012/06)
4 MAINTENANCE
4.1 RE-PRESSURING THE HEATING SYSTEM
To re-pressurise the heating system:
1. Remove the bottom panel to gain access to the filling key and filling link.
The fillink link is situated as indicated below:
2. Insert the filling key into the bottom of the charging link and push it upwards. The arrow on the key shaft must be in line with the
open padlock symbol on the charging link.
3. Turn the filling key clockwise to the closed padlock position.
It is important to regularly check the pressure gauge on your combination boiler to keep it running efficiently. The
pressure should be at an optimum level of 1.5 bar. If the pressure falls below 1 bar the boiler may stop working
and require re-pressurising & resetting.