Viessmann VITODENS 100-W Installation And Service Instructions Manual page 50

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
52 Burner blocked
58 No DHW heating
59 No DHW heating
5A Burner blocked
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
50
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
Short circuit, flow sensor
Lead break, cylinder tem-
perature sensor
Lead break, outlet temper-
ature sensor
Lead break, flow 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
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 53).
Check the outside temperature
sensor and lead (see page 53).
Check the boiler water temperature
sensor (see page 54).
Check the boiler water temperature
sensor (see page 54).
Check sensor (see page 55).
Check sensor (see page 56).
Check connections and lead; re-
place sensor if required.
Check sensor (see page 55).
Check sensor (see page 56).
Check connections and lead; re-
place sensor if required.
Fit flue gas temperature sensor
correctly (see page 58).
Check connections and cable; re-
place OpenTherm device if re-
quired.
Check sensor (see page 57).
Turn the ON/OFF switch off and on
again.
Check sensor (see page 57).
Check the temperature limiter and
connecting leads (see page 56).
Check the control unit and replace
if required.
Check the ionisation electrode and
connecting cables.
Press "Reset" (see page 51).
Replace control unit.
Check heating system fill level.
Check circulation pump. Vent the
system.
Press "Reset" (see page 51).