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Contents
Greenstar Heatslave II 2022+ – 6 721 843 979 (2022/01)
User instructions & customer care guide
Please read these instructions carefully before operating
your boiler.
These instructions are applicable to the Worcester,
Bosch Group boiler model(s) stated on the front cover of this
manual only and must not be used with any other make or
model of boiler.
The instructions apply in mainland UK only and should be
followed except for any statutory obligation.
If you are in any doubt contact the Worcester, Bosch Group
technical support.
This boiler must be installed by a competent person, e.g. an
OFTEC registered engineer, failure to install correctly could
lead to prosecution.
Please leave this guide, the installation instructions and
the completed checklist with the user.
Abbreviations
Dedicated to heating comfort
Thank you for purchasing a Greenstar oil fired condensing
boiler from Worcester, Bosch Group. The company prides itself
on manufacturing boilers to the strictest quality control
standards throughout every stage of production.
Worcester, Bosch Group has led the field in innovative boiler
design and performance for more than 50 years. This heritage
means all products are of exceptional quality and proven
reliability.
The condensing range in particular, is extremely energy
efficient, converting more of the fuel consumed into heat
offering you economical running costs and value for money.
It sits in ErP heating efficiency, band A, at the top of the energy
rated boilers available.
There is also the assurance of our no-nonsense parts and
labour guarantee - backed up by an optional servicing and
maintenance contract to keep your boiler operating at peak
condition and efficiency.
To find out more about Worcester, Bosch Group, log onto
www.worcester-bosch.co.uk.
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 Energy efficiency - - - - - - - - - - - - - - - 4
2.2 Servicing - - - - - - - - - - - - - - - - - - - - - - 4
2.3 User caution - - - - - - - - - - - - - - - - - - - 4
3 Using your boiler - - - - - - - - - - - - - - - - - - - - - - 5
3.1 Controls - - - - - - - - - - - - - - - - - - - - - - - 5
3.2 Operating the boiler - - - - - - - - - - - - - 6
3.2.1 Switching the boiler on/off - - - - - - - 6
3.2.2 Setting central heating temperature 6
3.2.3 Controlling central heating - - - - - - - - 7
3.2.4 Setting the hot water temperature - 7
3.2.5 Domestic hot water (DHW) - - - - - - - 7
3.2.6 Eco mode - - - - - - - - - - - - - - - - - - - - - 7
3.2.7 Frost protection - - - - - - - - - - - - - - - - 8
3.2.8 System pressure - - - - - - - - - - - - - - - - 8
4 Maintenance - - - - - - - - - - - - - - - - - - - - - - - - - 9
4.1 Troubleshooting - - - - - - - - - - - - - - - - 9
4.2 Servicing - - - - - - - - - - - - - - - - - - - - - - 9
4.3 Fault finding - - - - - - - - - - - - - - - - - - 10
4.4 System gassing - - - - - - - - - - - - - - - - 10
4.5 Maintaining your boiler - - - - - - - - - 11
5 General information - - - - - - - - - - - - - - - - - - 12
5.1 Ventilation information - - - - - - - - - 12
5.2 General notes - - - - - - - - - - - - - - - - - 12
6 Energy saving - - - - - - - - - - - - - - - - - - - - - - - 13
6.1 Tips on energy saving - - - - - - - - - - - 13
7 Guarantee - - - - - - - - - - - - - - - - - - - - - - - - - - 14
7.1 Fault or breakdown - - - - - - - - - - - - 14
7.2 Guarantee registration - - - - - - - - - - 15
7.3 Your guarantee - - - - - - - - - - - - - - - - 15
A checklist and service interval record can be
found at the rear of the Installation,
Commissioning and Servicing Instruction
manual.
SEDBUK Seasonal Efficiency for Domestic Boilers in
the United Kingdom.
OFTEC Oil Firing Technical Association for the
Petroleum Industry.
2


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