Viessmann VITODENS 111-W Installation And Service Instructions Manual page 41

Fault display
(cont.)
Fault code dis- System characteristics
played
0A Burner blocked
0A Burner blocked
0C Burner blocked
10 Continuous operation
18 Continuous operation
30 Burner blocked
38 Burner blocked
50 No DHW heating
51 No DHW heating
58 No DHW heating
59 No DHW heating
A3 Burner blocked.
A9 Control mode without Open-
Therm device
b0 Burner blocked
b7 Emergency mode
b8 Burner blocked
E3 Burner in a fault state
E5 Burner blocked
F0 Burner blocked
F1 Burner in a fault state
Cause
CO limiter (if installed) has
responded. CO concentra-
tion too high.
Gas pressure switch (if in-
stalled) has responded.
Gas pressure too low.
Mains voltage too low
Short circuit, outside tem-
perature sensor
Lead break, outside tem-
perature sensor
Short circuit, boiler water
temperature sensor
Lead break, boiler water
temperature sensor
Short circuit, cylinder tem-
perature sensor
Short circuit, outlet tem-
perature sensor
Lead break, cylinder tem-
perature sensor
Lead break, outlet temper-
ature sensor
Flue gas temperature sen-
sor incorrectly positioned.
No flame formation during
the sensor test
Communication error,
OpenTherm device
Short circuit, flue gas tem-
perature sensor
Burner control unit fault
Lead break, flue gas tem-
perature sensor
Fault in safety chain
Internal fault
Internal fault
Max. flue gas temperature
exceeded
Troubleshooting
Measures
Check the heating system. Re-
move the cause of escaping CO.
Check the gas supply.
Check the power supply.
Check the outside temperature
sensor and lead (see page 44).
Check the outside temperature
sensor and lead (see page 44).
Check the boiler water temperature
sensor (see page 45).
Check the boiler water temperature
sensor (see page 45).
Check the sensor (see page 46).
Check the sensor (see page 46).
Check the sensor (see page 46).
Check the sensor (see page 46).
Fit flue gas temperature sensor
correctly (see page 48).
Repeat the test several times if
necessary.
Check connections and cable; re-
place OpenTherm device if neces-
sary.
Check the sensor (see page 48).
Turn the ON/OFF switch off and on
again.
Check the sensor (see page 48).
Check the temperature limiter and
connecting leads (see page 47).
Check the control unit and replace
if required.
Check the ionisation electrode and
connecting cables.
Press "Reset" (see page 42).
Replace control unit.
Check heating system fill level.
Check circulation pump. Vent the
system.
Press "Reset" (see page 42).
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