Viessmann VITODENS 200-W Service Instructions Manual page 70

Troubleshooting
Fault codes
(cont.)
Fault Const. Weath.-
code on comp.
the dis-
play
b8 X X
bA X
bC X
bd X
bE X
bF X
C2 X X
70
System char- Cause
acteristics
Burner blocked Lead break,
flue gas tem-
perature sen-
sor
Mixer M2 regu- Communica-
lates to 20 °C tion fault,
flow tempera- extension kit
ture for heating
circuit with
mixer M2
Control mode Communica-
without remote tion fault,
control Vitotrol
remote con-
trol, heating
circuit A1
Control mode Communica-
without remote tion fault,
control Vitotrol
remote con-
trol, heating
circuit with
mixer M2
Control mode Vitotrol
remote con-
trol incor-
rectly pro-
grammed
Control mode Incorrect
LON commu-
nication mod-
ule
Control mode Communica-
tion fault,
solar control
unit
Measures
Check the flue gas
temperature sen-
sor (see
page 82).
Check extension
kit connections and
code. Start the
extension kit.
Check connec-
tions, cable, coding
address "A0" and
remote control DIP
switches (see
page 101)
Check connec-
tions, cable, coding
address "A0" and
remote control DIP
switches (see
page 101)
Check remote con-
trol DIP switch set-
tings (see
page 101).
Replace the LON
communication
module.
Check connections
and coding
address "54".