Viessmann VITODENS 200-W Service Instructions Manual page 69

Fault codes
(cont.)
Fault Const. Weath.-
code on comp.
the dis-
play
9C X X
9F X X
A7 X
b0 X X
b1 X X
b4 X X
b5 X X
b7 X X
System char- Cause
acteristics
Control mode Lead break,
temperature
sensor; con-
nects to the
Vitosolic at
S2
Control mode Solar control
unit fault; dis-
played if a
fault without
fault code
occurs at the
solar control
unit
Control mode Faulty pro-
as per deliv- gramming
ered condition unit
Burner blocked Short circuit,
flue gas tem-
perature sen-
sor
Control mode Communica-
as per deliv- tion fault, pro-
ered condition gramming
unit (internal)
Controls as if Internal fault
the outside
temperature
were 0 °C
Control mode Internal fault
as per deliv-
ered condition
Burner blocked Boiler coding
card missing,
faulty or
incorrect
boiler coding
card
Troubleshooting
Measures
Check the sensor
at the Vitosolic.
Check the solar
control unit (see
solar control unit
service instruc-
tions).
Replace the pro-
gramming unit.
Check the flue gas
temperature sen-
sor (see
page 82).
Check connections
and replace the
programming unit if
required.
Replace the control
unit.
Replace the control
unit.
Plug in boiler cod-
ing card or replace
it, if faulty.
69