Viessmann Vitodens 333 Service Instructions Manual page 73

Fault codes
(cont.)
Fault Const. Weath.-
code in comp.
the dis-
play
92 X X
93 X X
94 X X
9A X X
9b X X
9C X X
9F X X
A7 X
b0 X X
b1 X X
System char- Cause
acteristics
Control mode Collector
temperature
sensor
shorted out
Control mode Solar: Sen-
sor S3
shorted out
Control mode Solar: Cylin-
der primary
temperature
sensor
shorted out
Control mode Collector
temperature
sensor lead
broken
Control mode Solar: Sen-
sor S3 lead
broken
Control mode Solar: Cylin-
der primary
temperature
sensor lead
broken
Control mode Solar control
unit fault
message
Control opera- Faulty pro-
tion as per the gramming
delivered con- unit
dition
Burner Flue gas
blocked temperature
sensor short
circuit
Control opera- Communica-
tion as per the tion error
delivered con- program-
dition ming unit
Troubleshooting
Remedy
Check sensor
Check sensor
Check sensor
Check sensor
Check sensor
Check sensor
See solar control
unit service in-
structions
Replace program-
ming unit
Check flue gas
temperature sen-
sor
Check connec-
tions and replace
the programming
unit if required
73