| 1 | 173 854 | Main heat exchanger + o rings | | |
| 2 | 173 856 | Fan | | |
| 5 | 173 861 | Recuperator | | |
| 6 | 173 862 | Burner | | |
| 8 | 173 866 | Injectors | | |
| 9 | 173 868 | Detection electrode | | |
| 10 | 173 869 | Ignition electrode LH & RH | | |
| 17 | 173 203 / H07 717 | Safety Valve | | |
| 19 | 173 877 | Pump head | | |
| 20 | 173 879 | Diverter Valve Actuator | | |
| 21 | 173 880 | Auto air vent valve | | |
| 25 | 173 884 | Casing Controls Door | | |
| 26 | 173 885 | Controls Fascia | | |
| 27 | 173 886 | Knob potentiometer | | |
| 28 | 173 887 | Panel Control Cover | | |
| 29 | 173 888 | Panel Control Support | | |
| 30 | 173 889 | Panel User Wiring Cover | | |
| 31 | 173 890 | Main PCB | | |
| 33 | 173 892 | Pressure Gauge | | |
| 34 | 173 893 | Lens Clear | | |
| 35 | 173 894 | Expansion PCB | | |
| 36 | 173 161 | Mains Switch | | |
| 40 | 173 901 | Ignition Unit - NAC | | |
| 41 | 173 902 | Air pressure switch | | |
| 42 | 173 905 | Panel Front Sealing | | |
| 43 | 173 906 | Casing LH Side Panel | | |
| 44 | 173 907 | Casing RH Side Panel | | |
| 45 | 173 908 | Casing Front Panel | | |
| 46 | 173 913 | Casing Bottom Panel | | |
| 50 | 173 925 | Gas valve & gaskets | | |
| 51 | 173 926 | Condensate Blockage Thermistor | | |
| 52 | 173 927 | Overheat thermostat | | |
| 53 | 173 928 | Expansion vessel | | |
| 56 | 173 910 | Combustion Chamber Insulation Pack | | |
| 57 | 173 932 | Thermistor - Waterset CH & DHW | | |
| 58 | 173 544 / H07 781 | DHW plate heat exchanger | | |
| 59 | 173 936 | Gasket Kit (servicing) | | |
| 60 | 173 937 | Fixings Kit (servicing) | | |
| 61 | 174 051 | Fan Suppressor | | |
