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Contents
Contents
Safety precautions 3
Symbols 3
1 Layout of Appliance (ZSBR/ZWBR) 4
2 Operation 5
2.1 Standard display 5
2.2 Displaying service functions 5
2.3 Setting service functions 5
2.4 Resetting service functions to factory settings 5
2.4.1 Resetting service functions 0.0 to 4.9 to their
factory settings (Reset 1): 5
2.4.2 Resetting service functions 0.0 to 9.9 to the
factory setting (Reset 2): 5
3 Boiler service functions 6
3.1 Summary 6
3.2 Explanation of service functions 9
4 Rectifying faults 14
4.1 Boiler failure codes indication 14
4.1.1 ... on the boiler 14
4.1.2 ... on the programmer (optional accessory) 14
4.2 Summary 14
4.2.1 Appliance faults 14
4.2.2 Faults that are not indicated on any display 14
4.3 How to use the fault tables 16
4.4 Faults indicated on display 17
4.5 Faults that are not displayed 36
4.5.1 Appliance faults 36
4.5.2 Programmer faults 41
5 Appendix 45
5.1 NTC values 45
5.1.1 Outside temperature sensor 45
5.1.2 CH flow NTC sensor, heat store NTC
sensor, constant hot water NTC sensor
and hot water NTC sensor 45
5.2 Electronic schemes 46
5.3 List of most important replacement parts 47
5.4 Approved corrosion inhibitors and
anti-freeze fluids for central heating water 48
5.5 Detecting corrosion by CFCs 49
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