Viessmann VITODENS 200-W Service Instructions Manual page 72

Troubleshooting
Fault codes
(cont.)
Fault Const. Weath.-
code on comp.
the dis-
play
dd X
dE X
E4 X X
E5 X X
E8 X X
E9 X X
EA X X
72
System char- Cause
acteristics
Control mode Lead break,
without room room temper-
influence ature sensor,
heating circuit
A1
Control mode Lead break,
without room room temper-
influence ature sensor,
heating circuit
with mixer
M2
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 the room
temperature sen-
sor, heating circuit
A1 and the remote
control DIP switch
settings (see
page 101).
Check the room
temperature sen-
sor, heating circuit
with mixer M2 and
the remote control
DIP switch settings
(see page 101).
Replace the control
unit.
Replace the control
unit.
Check the ionisa-
tion electrode and
cable.
Press "E
RESET".
Check the ionisa-
tion electrode and
cable.
Check the flue gas
system for tight-
ness.
Press "E
RESET".
Check the ionisa-
tion electrode and
cable.
Press "E
RESET".