Viessmann VITODENS 111-W Installation And Service Instructions Manual page 40

Troubleshooting
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
F2 Burner in a fault state
40
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.
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
Temperature limiter has
responded
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 43).
Check the outside temperature
sensor and lead (see page 43).
Check boiler water temperature
sensor (see page 44).
Check boiler water temperature
sensor (see page 44).
Check sensor (see page 45).
Check sensor (see page 45).
Check sensor (see page 45).
Check sensor (see page 45).
Fit flue gas temperature sensor
correctly (see page 47).
Check connections and lead; re-
place OpenTherm device if re-
quired.
Check sensor (see page 47).
Turn the ON/OFF switch OFF and
ON again.
Check sensor (see page 47).
Check the temperature limiter and
connecting cables (see page 46).
Check the control unit and replace
if required.
Check the ionisation electrode and
connecting cables.
Press "Reset" (see page 41).
Replace control unit.
Check heating system fill level.
Check circulation pump. Vent the
system.
Press "Reset" (see page 41).
Check heating system fill level.
Check circulation pump. Vent the
system. Check the temperature
limiter and connecting cables (see
page 46).
Press "Reset" (see page 41).