Replacing The 4 A Fuses On The Electrical Terminal Blocks - Potterton SIRIUS THREE FS 50 Installation Manual

10 Maintenance
Fig.129 Checking the air in the intake circuit
7
10.3

Replacing the 4 A fuses on the electrical terminal blocks

Fig.130 Location of the fuse holder
1
110
7. If necessary, check the return into circulation of any combustion
products if using coaxial pipes. The sensor will then be connected to
the outlet connected to the combustion air intake circuit.
Caution
Be sure to correctly replace the plug after taking a measurement.
For more information, see
Using the boiler according to thermal output, page 88
CO2 checking and setting values, page 61
Setting the air/gas ratio (maximum heat input), page 59
Danger of electric shock
Before any work, switch off the mains supply to the boiler.
1. Pivot the fuse-holder socket N towards you.
7609493 - v08 - 24072018