| 7 | 170 905 / E67-489 | Burner | | |
| 8 | 173 520 | Combustion chamber insulation | | |
| 10 | 170 908 / E67-492 | Injector and housing | | |
| 12 | 172 625 | Fan assembly | | |
| 14 | 170 988 / E69-286 | Automatic air vent | | |
| 16 | 173 151 | Gas control valve Honeywell VK4115V | | |
| 19 | 170 916 / E67-500 | Flue thermistor | | |
| 20 | 170 917 / E67-501 | Control/Return thermistor | | |
| 21 | 170 918 / E67-502 | Overheat thermostat | | |
| 22 | 173 528 | Ignition electrode | | |
| 23 | 173 529 | Flame detection electrode | | |
| 27 | 170 926 / E67-511 | Condensate 'S' trap | | |
| 29 | 173 160 | User control (display unit) | | |
| 30 | 170 930 | PCB primary controls (includes plastic housing) | | |
| 31 | 170 931 / E67-519 | Fuse PCB (T3.15AT L250V) | | |
| 33 | 173 161 | Mains switch | | |
| 34 | 173 538 | Spark generator | | |
| 34A | 173 510 | Ignition lead | | |
| 38 | 170 938 / E67-527 | Gasket kit (servicing) | | |
| 44 | 171 014 / E68-376 | Seal kit (sealing panel) | | |
| 81 | 173 193 | DHW expansion vessel | | |
| 82 | 173 194 | CH expansion vessel | | |
| 83 | 173 195 | Pump | | |
| 85 | 173 197 | Diverter valve complete | | |
| 90 | 173 202 | Temp & pressure relief valve | | |
| 91 | 173 203 | CH pressure relief valve | | |
| 92 | 173 204 | DHW pressure relief valve | | |
| 97 | 173 209 | Thermistor cylinder | | |
| 101 | 173 213 | Pressure gauge | | |
