112
Dis-
played
fault
code
Const.
Weath.-
comp.
System char-
acteristics
Cause
Measures
EF
X
X
Burner in a fault
state
Flame is lost
after flame
has built.
Check the gas sup-
ply (gas pressure
and gas flow lim-
iter), check the flue
gas/ventilation air
system for flue gas
recirculation,
check the ionisa-
tion electrode
(replace if
required).
Press reset button
R.
F0
X
X
Burner blocked Internal fault
Replace the control
unit.
F1
X
X
Burner in a fault
state
Flue gas tem-
perature lim-
iter has
responded
Check the heating
system fill level.
Vent the system.
Press reset button
R
after the flue sys-
tem has cooled
down.
F2
X
X
Burner in a fault
state
The tempera-
ture limiter
has respon-
ded
Check the heating
system fill level.
Check the circula-
tion pump. Vent the
system. Check the
temperature limiter
and connecting
cables
Press reset button
R.
F3
X
X
Burner in a fault
state
Flame signal
is already
present at
burner start
Check the ionisa-
tion electrode and
connecting cable.
Press reset button
R.
Troubleshooting
Fault codes
(cont.)
5457 552 GB
Summary of Contents for FS2B
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