Viessmann VITODENS 200-W Installation And Service Instructions Manual page 100

Troubleshooting
Fault messages
(cont.)
Displayed fault System characteristics
code
96 Burner blocked
98 Control mode
99 Control mode
9A No solar DHW heating
9B Control mode
9C No solar DHW heating
9E Control mode
9F Control mode
A3 Burner blocked
A7 Control mode as per deliv-
ered condition
A8 Burner blocked. The venting
program is started automati-
cally (see page 146).
A9 If a heating circuit with mixer
is connected, the burner op-
erates at its lower heating
output.
If only one heating circuit
without mixer is connected,
the burner is blocked.
B0 Burner in a fault state
B1 Control mode as per deliv-
ered condition
B5 Control mode as per deliv-
ered condition
B7 Burner blocked
B8 Burner in a fault state
BA Mixer regulates to 20 °C flow
temperature.
100
Cause
CO limiter sensor fault
Lead break, temperature
sensor /
Lead break, temperature
sensor
aÖ
Lead break, collector tem-
perature sensor
Lead break, collector re-
turn temperature sensor
Lead break, cylinder tem-
perature sensor
No flow rate or flow rate
too low in the solar circuit,
or temperature limiter has
responded.
Solar control module or
Vitosolic fault
Flue gas temperature sen-
sor incorrectly positioned
Programming unit faulty
Air in the internal circula-
tion pump or minimum
flow rate not achieved
Internal circulation pump
blocked
Short circuit, flue gas tem-
perature sensor
Communication error, pro-
gramming unit
Internal fault
Boiler coding card fault
Lead break, flue gas tem-
perature sensor
Communication error, ex-
tension kit for heating cir-
cuit 2 (with mixer)
Measures
Replace the CO limiter.
If the system is to be temporarily
operated without a CO limiter:
Disconnect plug X21 from the
■
control unit.
Set parameter 49:0.
■
Check sensor on the solar con-
/
trol module.
Check sensor on the solar con-
aÖ
trol module.
Check temperature sensor
the solar control module or the
sensor on the Vitosolic.
Check the temperature sensor at
terminal S3 on the Vitosolic 100.
Check temperature sensor
the solar control module or the
sensor on the Vitosolic.
Check solar circuit pump and solar
circuit. Acknowledge fault mes-
sage.
Replace solar control module or
Vitosolic.
Fit flue gas temperature sensor
correctly (see page 111).
Replace the programming unit.
Vent the system if the fault mes-
sage continues to be displayed.
Check circulation pump.
Check flue gas temperature sensor
and connecting lead.
Check connections and replace
programming unit if required.
Replace control unit.
Plug in boiler coding card or re-
place if faulty.
Check flue gas temperature sensor
and connecting lead.
Check extension kit connections
and assignment.
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