Potterton SIRIUS FS Installation & Servicing Instructions Manual page 54

7.3 REMOVAL, INSPECTION AND CHANGING OF COMPONENTS
None of the controls or electronic components are repairable, if they are defective they
must be replaced
In all cases, before work commences turn off the Mains Electricity and Gas Supply.
The following major components can be replaced and the methods for removal are listed in
the following sections:
Sirius FS
7.3.1 - HMI display screen
7.3.2 - Heat engine boiler control PCB (LMS14)
7.3.3 - LPB communications bus
7.3.4 - LMS14 Interface PCB
7.3.5 - Relays
7.3.6 - Flow and return temperature sensors
7.3.7 - Water pressure transmitter
7.3.8 - Flow high temperature limit thermostat
7.3.9 - Rear High temperature thermal fuse
7.3.10 - High temperature door limit thermostat
7.3.11 - Spark generator
7.3.12 - Spark and ionisation electrodes
7.3.13 - Combustion fan
7.3.14 - Gas valve
7.3.15 - Air control valve
7.3.16 - Burner head removal with fan removed
7.3.17 - Burner head removal with air control valve removed
7.3.18 - Combustion chamber inspection & cleaning
7.3.19 - Rear heat exchanger insulation replacement
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GB/IE