Viessmann VITODENS 343-F WS4A, Installation And Service Instructions Manual

Page: 94 / 152

Fault code
on the dis-
play System character-
istics Cause Measures
9A Control mode Solar: Lead of the
collector tempera-
ture sensor S1 at
the Vitosolic bro-
ken Check the sensor (see
page 102).
93 Control mode Solar: Sensor S3
at the Vitosolic
shorted out Check the sensor (see
page 102).
9b Control mode Solar: Lead of the
sensor S3 at the
Vitosolic broken Check the sensor (see
page 102).
94 Control mode Solar: Cylinder
temperature sen-
sor S2 at the
Vitosolic shorted
out Check sensor.
9C Control mode Lead of the cylin-
der temperature
sensor S2 at the
Vitosolic broken Check the sensor (see
page 102).
9F Control mode Solar control unit
fault message See solar control unit
service instructions.
A6 Control mode Impressed cur-
rent anode faulty;
no protective cur-
rent Check impressed cur-
rent anode cable con-
tacts (see page 42)
A7 Control mode as per
delivered condition Faulty program-
ming unit. Replace the program-
ming unit.
b0 Burner blocked Flue gas tem-
perature sensor
shorted out Check the flue gas tem-
perature sensor (see
page 104).
b8 Burner blocked Flue gas tem-
perature sensor
lead broken Check the flue gas tem-
perature sensor (see
page 104).
b1 Control mode as per
delivered condition Communication
fault; program-
ming unit (inter-
nal) Check connections and
replace the program-
ming unit, if necessary.
Fault codes
(cont.)
94
Troubleshooting
5592
883
GB