Troubleshooting
3
Subject to modifications resulting from technical improvements!
Buderus Ltd. • http://www.buderus-domestic.co.uk
Servicing manual for wall-mounted condensing gas boiler 600 Series 11S/19S/24S/24C • Issued 02/2006
63
3.1.29 Measuring the ionisation current
z
Disconnect the system from the power supply.
z
Loosen the plug-and-socket connector of the monitoring
cable and connect the measuring device in series.
Select the µA direct current range on the multimeter.
The multimeter must have a resolution of at least 1 µA.
z
Reconnect the system to the power supply and turn the
chimney-sweep switch to “
1
”.
z
Measure the ionisation current.
The ionisation current must be > 2 µA DC.
z
Enter the reading on the report form.
z
Disconnect the system from the power supply.
z
Remove the measuring device and restore the
plug-and-socket connection to its original state.
z
Turn the chimney-sweep switch to position “
0
”.
z
Refit the cover for 2nd control level.
z
Reconnect the system to the power supply. When the
display shows “
7
”, press the service button to display “
c
”.
Press the "reset" button. The display shows “
r
”.
3.1.30 Replacing the ionisation electrode
z
Remove the CombiVENT
air combination unit
as described
in “Replacing the gas burner fitting” on page 60.
z
Loosen the plug-and-socket connection of the ionization
electrode.
z
Loosen screw (fig. 84, item 1) by a half-turn and slide bar
to remove.
z
Pull electrode to remove, and fit new unit.
z
Reassemble by following the above procedure in reverse.
Fig. 83 Measuring the ionisation current
Fig. 84 Replacing the ionisation electrode
1
