71
Fault code dis-
played
System characteristics
Cause
Measures
DA
Control mode without room
influence
Short circuit, room tem-
perature sensor, heating
circuit 1 (without mixer)
Check room temperature sensor,
heating circuit 1.
DB
Control mode without room
influence
Short circuit, room tem-
perature sensor, heating
circuit 2 (with mixer)
Check room temperature sensor,
heating circuit 2.
DC
Control mode without room
influence
Short circuit, room tem-
perature sensor, heating
circuit 3 (with mixer)
Check room temperature sensor,
heating circuit 3.
DD
Control mode without room
influence
Lead break, room temper-
ature sensor, heating cir-
cuit 1 (without mixer)
Check room temperature sensor
for heating circuit 1 and the remote
control settings.
DE
Control mode without room
influence
Lead break, room temper-
ature sensor, heating cir-
cuit 2 (with mixer)
Check room temperature sensor
for heating circuit 2 and the remote
control settings.
DF
Control mode without room
influence
Lead break, room temper-
ature sensor, heating cir-
cuit 3 (with mixer)
Check room temperature sensor
for heating circuit 3 and the remote
control settings.
E0
Control mode
External LON subscriber
error
Check connections and LON sub-
scribers.
E1
Burner in a fault state
Ionisation current too high
during calibration
Check gap between ionisation
electrode and burner gauze as-
sembly (see page 24).
In open flue operation, prevent
high levels of dust in the combus-
tion air.
Press reset button
R
.
E3
Burner in a fault state
Heat transfer too low dur-
ing calibration.
Temperature limiter has
shut down.
Ensure adequate heat transfer.
Press reset button
R
.
E4
Burner blocked
24 V power supply fault
Replace control unit.
E5
Burner blocked
Flame amplifier fault
Replace control unit.
E7
Burner in a fault state
Ionisation current too low
during calibration
Check ionisation electrode for the
following:
■
Distance to burner gauze assem-
bly (see page 24)
■
Contamination on electrode
■
Connecting cable and plug-in
connections
Check flue system; remove flue
gas recirculation if required.
Press reset button
R
.
Troubleshooting
Fault codes
(cont.)
5839829
Diagnosis