Troubleshooting
3
Subject to modifications resulting from technical improvements!
Buderus Ltd. • http://www.buderus-domestic.co.uk
10
Servicing manual for wall-mounted condensing gas boiler 600 Series 11S/19S/24S/24C • Issued 02/2006
Fig. 7
Fault warning message 2C: Safety sensor temp. exceeds 100 °C
Yes
A
No
Check safety sensor and wiring
Fit the casing (page 48)
"reset"
600 Series 11S / 19S / 24S / 24C
OK
Safety sensor temp. exceeds
100 °C
2
C
Check circulation pump (page 54)
New fault warning message
2C
?
Check system and heat exchanger, as
indicated in the installation and servicing
instructions, for signs of airlocks and dirt -
purge and/or clean as required
Circulation pump OK?
Remove the casing (page 48)
Safety sensor OK?
Open maintenance shutoff valves
Fill up with water as indicated in the
installation and servicing instruc-
tions, and purge the system of air
Open one thermostatic valve
Replace safety sensor (page 55)
Replace circulation pump (page 54)
No
No
No
No
No
Wait approx. 30 sec for the boiler to return
automatically to normal operation
Yes
Yes
Yes
Yes
Yes
Filter to catch dirt fitted?
If yes, is it unclogged?
Are all
maintenance shutoff
valves open?
Is the water
pressure in the system at
least 1 bar?
Is at least one
thermostatic valve open (to
control the amount of water
circulating)?
