Viessmann VITODENS 200-W Service Instructions Manual page 104

Troubleshooting
Fault codes
(cont.)
Dis- Const. Weath.-
played comp.
fault
code
dF X
E0 X
E4 X X
E5 X X
E8 X X
E9 X X
EA X X
104
System char- Cause
acteristics
Control mode Lead break,
without room room temper-
influence ature sensor,
heating circuit
3 (with mixer)
Control mode Fault external
LON sub-
scriber
Burner blocked Fault, supply
voltage 24 V
Burner blocked Fault, flame
amplifier
Burner in a fault The ionisa-
state tion current
lies outside
the permissi-
ble range
Burner in a fault The ionisa-
state tion current
lies outside
the permissi-
ble range dur-
ing calibra-
tion
Burner in a fault The ionisa-
state tion current
lies outside
the permissi-
ble range dur-
ing calibra-
tion
Measures
Check room tem-
perature sensor for
heating circuit 3
and remote control
settings (see
page 132)
Check connections
and LON subscrib-
ers
Replace the control
unit.
Replace the control
unit.
Check the ionisa-
tion electrode and
cable.
Press reset button
R.
Check the ionisa-
tion electrode and
cable.
Check the flue gas
system for tight-
ness.
Press reset button
R.
Check the ionisa-
tion electrode and
cable.
Press reset button
R.