Fault Codes - Viessmann Vitodens 333 Service Instructions Manual

Troubleshooting
Calling up fault codes from the fault memory (fault . . .
Press the following keys:
1. G + d simultaneously for
approx. 2 s.

Fault codes

Display Const. Weath.
fault comp.
code
0F X X
10 X
18 X
20 X X
28 X X
72
2. a/b
3. Note
All saved fault codes can be
deleted with e.
4. d
System char- Cause
acteristics
Control mode Maintenance Service the equip-
Regulates as Outside tem-
if the outside perature
temperature sensor
was 0 °C shorted out
Regulates as Outside tem-
if the outside perature
temperature sensor lead
was 0 °C broken
Regulates Flow tem-
without flow perature
temperature sensor low
sensor (low loss header
loss header) shorted out
Regulates Low loss
without flow header flow
temperature temperature
sensor (low sensor break
loss header)
(cont.)
for individual fault
codes.
terminate the scan.
Remedy
ment. After the
service, set code
"24:0".
Check the outside
temperature sen-
sor (see page 80)
Check the outside
temperature sen-
sor (see page 80)
Check the low
loss header flow
temperature sen-
sor (see page 81)
Check the low
loss header flow
temperature sen-
sor (see page 81)