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
47
3.1
Troubleshooting tasks
3.1.1
Unblocking the 600 Series 11S / 19S / 24S / 24C
Press the “reset” button (fig. 44) after rectifying each fault.
A letter “
r
” will appear on the display.
This unblocks the UBA and returns it to standby mode.
If the "reset" button is not kept pressed for long enough, the
display will first show a "
7
" and, after the Service button is
pressed, a "
C
".
Unblock by pressing the “reset” button once more and keeping
it pressed for the required time.
3.1.2
Chimney-sweep mode
Certain troubleshooting tasks must be carried out with the
600 Series 11S / 19S / 24S / 24C in heating mode.
z
Before proceeding, open the cover of the second operating
level on the UBA (fig. 45).
z
Set the chimney-sweep switch to “
1
”.
z
Remember to return the chimney-sweep switch to “
0
” once
work is complete.
z
Close the cover of the second operating level on the UBA.
CAUTION
All work on the gas supply must be carried out
by a CORGI registered engineer.
All work on water and electrical supplies must
be carried out by a competent person.
Fig. 44 "Reset" button
1 2
10
0 1
11
KW
10
1
1
1
NOTE
The system cannot be unblocked by
disconnecting at the master switch.
Fig. 45 Chimney-sweep switch
0
1
NOTE
The system cannot be used to supply hot water
while it is in chimney-sweep mode. With
chimney sweep mode activated, the boiler
heats up to its preset feed temperature.
