CONTENTS
TR05A140.B1107
5.7 Control parameter adjustment 36
5.7.1 Accessing the parameters menu 36
5.7.2 Adjusting the parameters 37
5.8 Gas data 42
5.8.1 Technical reference tables 42
6 MAINTENANCE 43
6.1 General warnings 43
6.2 Boiler inspection 43
6.3 Accessing the boiler 44
6.3.1 Front panel removal 44
6.3.2 Side panel removal 44
6.3.3 Control panel access 44
6.4 Draining the central heating system 45
6.5 Flushing the central heating system 45
6.6 Maintenance operations 46
6.6.1 Primary heat exchanger and burner unit 47
6.6.2 Ignition and ionisation electrodes 48
6.6.3 Safety thermostat 48
6.6.4 Heating sensor 48
6.6.5 Gas valve 49
6.6.6 Circulating pump motor body 49
6.6.7 Electric fan 50
6.6.8 Expansion vessel 50
6.6.9 Modulation circuit board 51
6.6.10 Electric fan circuit board 51
6.6.11 Primary heat exchanger replacement 51
6.7 Wiring diagram 52
6.8 Troubleshooting 53
6.8.1 Error codes 53
6.9 Parts lists 54
6.9.1 Main components 54
7 OPTIONAL CONTROLS 55
7.1 External controls, programmers and room thermostats 55
7.1.1 Appliance connections 55
7.1.2 S-Plan wiring schematic 56
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