Viessmann VITODENS 200-W Installation And Service Instructions Manual page 85

Fault codes
(cont.)
Displayed Const.
fault code
9A X
9b X
9C X
9E X
9F X
A3
A4
A7
b0 X
b1 X
b5 X
b7 X
b8 X
bA
bb
Weather- System characteris-
comp. tics
X No solar DHW heat-
ing
X Control mode
X No solar DHW heat-
ing
X Control mode
X Control mode
X Burner blocked.
X Control mode
X Control mode as per
delivered condition
X Burner blocked
X Control mode as per
delivered condition
X Control mode as per
delivered condition
X Burner blocked
X Burner blocked
X Mixer regulates to
20 C flow tempera-
°
ture.
X Mixer regulates to
20 C flow tempera-
°
ture.
Cause Measures
Lead break, collec- Check temperature sen-
tor temperature sor
&
sensor module or sensor on the
Vitosolic.
Lead break, cylin- Check temperature sen-
der temperature sor at connection S3 on
sensor the Vitosolic.
Lead break, cylin- Check temperature sen-
der temperature sor
%
sensor module or sensor on the
Vitosolic.
No flow rate in so- Check solar circuit pump
lar circuit or flow and solar circuit. Acknowl-
rate too low, or edge fault message.
temperature limiter
has responded
Solar control mod- Replace solar control
ule or Vitosolic fault module or Vitosolic
Flue gas tempera- Fit flue gas temperature
ture sensor incor- sensor correctly (see
rectly positioned. page 94).
Max. system pres- Check system pressure
sure exceeded (max. system pressure
6 bar).
Check the function and
sizing of the diaphragm
expansion vessel.
Vent the heating system.
Programming unit Replace programming
faulty unit
Short circuit, flue Check flue gas tempera-
gas temperature ture sensor
sensor
Communication er- Check connections and
ror, programming replace programming unit
unit if required
Internal fault Replace control unit
Boiler coding card Plug in boiler coding card
fault or replace if faulty
Lead break, flue Check flue gas tempera-
gas temperature ture sensor
sensor
Communication er- Check extension kit con-
ror, extension kit nections and code.
for heating circuit 2
(with mixer)
Communication er- Check extension kit con-
ror, extension kit nections and code.
for heating circuit 3
(with mixer)
Troubleshooting
on solar control
on solar control
85