Viessmann VITODENS 333 Operations Instructions Page 83

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Fault
code
on the
display
Const. weath.-
comp.
System char-
acteristics
Cause Measures
dd X Control mode
without room
influence
Room tem-
perature
sensor, heat-
ing circuit A1
lead broken
Check the room
temperature sen-
sor, heating cir-
cuit A1 and the
remote control
DIP switch set-
tings (see
page 114)
dE X Control mode
without room
influence
Room tem-
perature
sensor, heat-
ing circuit
with mixer
M2 lead bro-
ken
Check the room
temperature sen-
sor, heating cir-
cuit with mixer M2
and the remote
control DIP switch
settings (see
page 114)
E4 X X Burner
blocked
Fault, supply
voltage 24 V
Replace the con-
trol unit.
E5 X X Burner
blocked
Fault flame
amplifier
Replace the con-
trol unit.
E6 X X Burner
blocked
System
pressure too
low
Top up with water.
E8 X X Burner in a
fault state
The ionisa-
tion current
lies outside
the permissi-
ble range
Check the ionisa-
tion electrode and
cable.
Press "E
RESET".
E9 X X Burner in a
fault state
The ionisa-
tion current
lies outside
the permissi-
ble range
during cali-
bration
Check the ionisa-
tion electrode and
cable.
Check the flue
gas system for
tightness.
Press "E
RESET".
Fault codes (cont.)
83
Troubleshooting
5692 682 GB
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