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
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