80
Displayed
fault code
Const.
Weath.-
comp.
System characteris-
tics
Cause
Measures
dF
X
Control mode without
room influence
Lead break, room
temperature sen-
sor
heating circuit 3
(with mixer)
Check room temperature
sensor heating circuit 3
and remote control set-
tings (see page 101)
E0
X
Control mode
Fault, external LON
subscriber
Check connections and
LON subscribers
E1
X
X
Burner in a fault state Ionisation current
too high during cal-
ibration
Check gap between ioni-
sation electrode and burn-
er gauze assembly (see
page 31).
In open flue operation,
prevent high incidence of
dust in the combustion air.
Press reset button
R
.
E3
X
X
Burner in a fault state Heat transfer too
low during calibra-
tion.
Temperature limiter
caused shutdown.
Ensure adequate heat
transfer.
Press reset button
R
.
E4
X
X
Burner blocked
Fault, 24 V supply
voltage
Replace control unit.
E5
X
X
Burner blocked
Fault, flame ampli-
fier
Replace control unit.
E7
X
X
Burner in a fault state Ionisation current
too low during cali-
bration
Check ionisation elec-
trode:
■
Distance to burner
gauze assembly (see
page 31)
■
Electrode contaminated
■
Connecting lead and
plug-in connections
Check flue system; reme-
dy flue gas recirculation if
required.
Press reset button
R
.
E8
X
X
Burner in a fault state The ionisation cur-
rent lies outside
the permissible
range
Check gas supply (gas
pressure and gas flow
switch), gas train and
connecting lead.
Check allocation of gas
type (see page 25).
Check ionisation elec-
trode:
■
Distance to burner
gauze assembly (see
page 31)
■
Electrode contaminated
Press reset button
R
.
Troubleshooting
Fault codes
(cont.)
5772 980 GB
Service