111
Dis-
played
fault
code
Const.
Weath.-
comp.
System char-
acteristics
Cause
Measures
Eb
X
X
Burner in a fault
state
Heat draw-off
repeatedly
too low during
calibration
Initiate a heat
draw-off. Switch
the boiler OFF and
ON again.
Press reset button
R.
EC
X
X
Burner in a fault
state
Parameter
fault during
calibration
Press reset button
R
or
replace boiler cod-
ing card and press
reset button
R
.
Ed
X
X
Burner in a fault
state
Internal fault
Replace the control
unit.
EE
X
X
Burner in a fault
state
Flame signal
is not present
or too weak at
burner start
Check the ionisa-
tion electrode and
connecting cable,
measure the ioni-
sation current,
check the gas sup-
ply (gas pressure
and gas flow lim-
iter), check the gas
train, ignition, igni-
tion module, igni-
tion electrodes and
the condensate
drain.
Press reset button
R.
Troubleshooting
Fault codes
(cont.)
5457 552 GB
Service