Viessmann VITODENS 200-W Service Instructions Manual page 98

Troubleshooting
Fault codes
(cont.)
Dis- Const.
played
fault
code
dd
dE
dF
E0
E1 X
98
Weath.- System char-
comp. acteristics
X Control mode
without room
influence
X Control mode
without room
influence
X Control mode
without room
influence
X Control mode
X Burner in a fault
state
Cause Measures
Lead break, Check room tem-
room temper- perature sensor for
ature sensor, heating circuit 1
heating circuit and remote control
1 (without settings (see
mixer) page 127)
Lead break, Check room tem-
room temper- perature sensor for
ature sensor, heating circuit 2
heating circuit and remote control
2 (with mixer) settings (see
page 127)
Lead break, Check room tem-
room temper- perature sensor for
ature sensor, heating circuit 3
heating circuit and remote control
3 (with mixer) settings (see
page 127)
Fault external Check connections
LON sub- and LON subscrib-
scriber ers
Ionisation Check gap
current too between ionisation
high during electrode and
calibration burner gauze
assembly (see
page 21).
In open flue mode,
prevent very dusty
conditions for the
combustion air.
Press reset button
R.