C Safety Sensor Exceeds 100 °C - Buderus 24C Servicing Manual

3 Troubleshooting
2
Safety sensor temp. exceeds
100 °C
Wait approx. 30 sec for the boiler to return
automatically to normal operation
New fault warning message
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
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)?
Remove the casing (page 48)
Check safety sensor and wiring
(page 55)
Safety sensor OK?
Check circulation pump (page 54)
Circulation pump OK?
Filter to catch dirt fitted?
If yes, is it unclogged?
page 46
Fig. 7 Fault warning message 2C: Safety sensor temp. exceeds 100 °C
Subject to modifications resulting from technical improvements!
10 Servicing manual for wall-mounted condensing gas boiler 600 Series 11S/19S/24S/24C • Issued 02/2006
C
No
2C?
Yes
Yes
Yes
Yes
Yes
Yes
A
No
Open maintenance shutoff valves
Fill up with water as indicated in the
No
installation and servicing instruc-
tions, and purge the system of air
No
Open one thermostatic valve
No
Replace safety sensor (page 55)
No
Replace circulation pump (page 54)
Fit the casing (page 48)
"reset"
600 Series 11S / 19S / 24S / 24C
OK
Buderus Ltd. • http://www.buderus-domestic.co.uk