Key to symbols and safety instructions
6 720 811 922 (2014/07) 3
11 Displays . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
12 Fault finding . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
12.1 Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
12.2 Faults that are displayed . . . . . . . . . . . . . . . . . . . . . . . . 48
12.3 Faults that are not displayed . . . . . . . . . . . . . . . . . . . . . 49
12.4 Sensor values . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
12.4.1 Flow temperature sensor . . . . . . . . . . . . . . . . . . . . . . . 49
12.4.2 DHW temperature sensor . . . . . . . . . . . . . . . . . . . . . . . 49
12.5 Code plug . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
1 KEY TO SYMBOLS AND SAFETY INSTRUCTIONS
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 injury.
• CAUTION indicates possible injury.
• WARNING indicates possible severe injury.
• DANGER indicates possible risk to life.
IMPORTANT INFORMATION
ADDITIONAL SYMBOLS
SYMBOLS USED IN THIS MANUAL
PLEASE READ THESE INSTRUCTIONS CAREFULLY BEFORE
STARTING INSTALLATION.
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)
Table 1 Symbols
Domestic Hot Water
Central Heating
Hot Water Storage Cylinder
Domestic Cold Water Supply
Electrical Supply
Gas Supply
Table 2 Commonly used symbols
These instructions are applicable to the Worcester appliance model(s)
stated on the front cover of this manual only and must not be used with
any other make or model of appliance.
These instructions apply in the UK and Ireland only and must be
followed except for any statutory obligations.
This appliance must be installed by a GAS SAFE registered,
competent person. Failure to install correctly could lead to
prosecution.
If you are in any doubt, contact the Worcester Technical helpline
(0844 892 3366).
Please leave these instructions with the completed BENCHMARK
CHECKLIST, (or a certificate confirming compliance with IS 813, Eire
only) and the user manual with the owner or at the gas meter after
installation or servicing.
Distance learning and training courses are available from Worcester.
The BENCHMARK CHECKLIST can be found in the back of this
Installation manual.
Table 3
ØDiameter
NG Natural Gas
LPG Liquid Petroleum Gas
CH Central Heating
DHW Domestic Hot Water
DCW Domestic Cold Water
PRV Pressure Relief Valve
NTC Negative Temperature Coefficient (sensor)
IP Ingress Protection
RCD Residual Current Device
TRV Thermostatic Radiator Valve
ECV Emergency Control Valve
WRAS Water Regulations Advisory Scheme
SEDBUK Seasonal Efficiency of Domestic Boilers in the United
Kingdom
Table 4 Abbreviations used in this manual
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