Viessmann VITODENS 200-W Installation And Service Instructions Manual page 64

Troubleshooting
Fault codes
(cont.)
Fault code dis- System characteristics
played
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
A9 Burner 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
bF Control mode
C1 Control mode
C2 Control mode
C3 Control mode
64
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 or inadequate flow rate
in collector circuit, or tem-
perature limiter has re-
sponded.
Solar control module or
Vitosolic fault
Flue gas temperature sen-
sor incorrectly positioned.
Programming unit faulty
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
Incorrect LON communi-
cation module
Communication error, EA1
extension
Communication error, so-
lar control module or
Vitosolic
Communication error,
AM1 extension
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 solar control
/
module.
Check sensor on solar control
aÖ
module.
Check temperature sensor
solar control module or sensor on
the Vitosolic.
Check temperature sensor at ter-
minal S3 on the Vitosolic 100.
Check temperature sensor
solar control module or 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 76).
Replace the programming unit.
Check circulation pump.
Check flue gas temperature sensor
and connecting lead.
Check connections; replace pro-
gramming unit if necessary.
Replace control unit.
Plug in boiler coding card or re-
place if faulty.
Check flue gas temperature sensor
and connecting lead.
LON communication module.
Check connections.
Check solar control module or
Vitosolic
Check connections.
on
&
on
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