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5693 982 - 04
Vitotronic 300, GW2B Installation and Service
Fault Display
(continued)
Troubleshooting
Fault codes
Displayed
fault code
System characteristics
Cause
Measures
0F
Control mode.
Service “0F” is only
displayed in the fault
history.
Service required.
Note:
After the service, set code “24:0”
10
Controls as if the outside
temperature was 32°F (0°C)
Short circuit, outside
temperature sensor
Check the outside temperature sensor
(see page 125).
18
Controls as if the outside
temperature was 32°F (0°C)
Lead break, outside
temperature sensor
Check the outside temperature sensor
(see page 125).
19
Controls as if the outside
temperature was 32°F (0°C)
Communication fault,
outside temperature
sensor RF
Check the wireless connection (place
the outside temperature sensor RF close
to the wireless base). De-register and
then re-register the outside temperature
sensor.
Replace if necessary (see separate
installation and service instructions).
30
- With DHW tank:
Circulation pump for DHW tank
heating on; boiler is maintained
at set DHW tank temperature.
- Without DHW tank:
Boiler is regulated by the
temperature controller.
Short circuit, boiler water
temperature sensor
Check the boiler water temperature
sensor (see page 124).
38
- With DHW tank:
Circulation pump for DHW tank
heating on; boiler is maintained
at set DHW tank temperature.
- Without DHW tank:
Boiler is regulated by the
temperature controller.
Lead break, boiler water
temperature sensor
Check the boiler water temperature
sensor (see page 124).
40
Mixing valve is being closed.
Short circuit, supply
temperature sensor,
heating circuit with
mixing valve M2
(heating circuit 2)
Check the supply temperature sensor
(see page 124).
