Viessmann VITODENS 200-W Service Instructions Manual page 94

Troubleshooting
Fault codes
(cont.)
Dis- Const.
played
fault
code
98 X
99 X
9A X
9b X
9C X
9E X
9F X
A6 X
A7
94
Weath.- System char-
comp. acteristics
X Control mode
X Control mode
X No DHW heat-
ing
X Control mode
X No DHW heat-
ing
X Control mode
X Control mode
X Control mode
X Control mode
as per deliv-
ered condition
Cause Measures
Lead break, Check sensor /
temperature
on solar control
sensor / module.
Lead break, Check sensor aÖ
temperature on solar control
sensor aÖ module.
Lead break, Check temperature
collector tem- sensor & on solar
perature sen- control module or
sor
Vitosolic sensor.
Lead break, Check temperature
cylinder tem- sensor at connec-
perature sen- tion S3 to Vitosolic
sor 100.
Lead break, Check temperature
cylinder tem- sensor % on solar
perature sen-
control module or
sor
Vitosolic sensor.
No flow rate Check solar circuit
in solar circuit pump and solar cir-
or flow rate cuit. Acknowledge
too low, or fault message.
temperature
limiter has
responded
Solar control Replace solar con-
module or trol module or
Vitosolic Vitosolic
faulty
Impressed Replace
current anode impressed current
faulty anode
Programming Replace program-
unit faulty ming unit