Fault code
on the dis-
play
System character-
istics
Cause
Measures
dA
Control mode with-
out room influence
Room tempera-
ture sensor, heat-
ing circuit A1
shorted out
Check the room tem-
perature sensor, heating
circuit A1.
db
Control mode with-
out room influence
Room tempera-
ture sensor, heat-
ing circuit with
mixer M2 shorted
out
Check the room tem-
perature sensor, heating
circuit with mixer M2.
dd
Control mode with-
out room influence
Room tempera-
ture sensor, heat-
ing circuit A1 lead
broken
Check the room tem-
perature sensor, heating
circuit A1 and the re-
mote control DIP switch
settings (see page 126)
dE
Control mode with-
out room influence
Room tempera-
ture sensor, heat-
ing circuit with
mixer M2 lead
broken
Check the room tem-
perature sensor, heating
circuit with mixer M2
and the remote control
DIP switch settings (see
page 126)
E4
Burner blocked
Internal fault
Replace the control unit.
E5
Burner blocked
Internal fault
Check the ionisation
electrode and cables.
Check the flue gas sys-
tem for soundness.
Press "
E
RESET"; re-
place the control unit, if
required.
E8
Burner in a fault
state
The ionisation
current lies out-
side the permissi-
ble range
Check the ionisation
electrode and cable.
Press "
E
RESET".
E9
Burner in a fault
state
The ionisation
current lies out-
side the permissi-
ble range during
calibration
Check the ionisation
electrode and cable.
Press "
E
RESET".
Fault codes
(cont.)
96
Troubleshooting
5592
883
GB
Summary of Contents for VITODENS 343-F WS4A
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