Viessmann VITODENS 222-F Installation And Service Instructions Manual page 106

Troubleshooting
Fault codes
(cont.)
Dis- Const.
played
fault
code
48
4C
50 X
51 X
58 X
59 X
A7
106
Weath.- System char-
comp. acteristics
X Mixer closes
X Mixer closes
X No DHW heat-
ing
X No DHW heat-
ing
X No DHW heat-
ing
X No DHW heat-
ing
X Control mode
as per deliv-
ered condition
Cause Measures
Lead break, Check flow temper-
flow tempera- ature sensor (see
ture sensor, page 131)
heating circuit
2 (with mixer)
Lead break, Check flow temper-
flow tempera- ature sensor (see
ture sensor, page 131)
heating circuit
3 (with mixer)
Short circuit, Check sensors
cylinder tem- (see page 122)
perature sen-
sor
Short circuit, Check sensor (see
outlet temper- page 122)
ature sensor
Lead break, Check sensors
cylinder tem- (see page 122)
perature sen-
sor
Lead break, Check sensor (see
outlet temper- page 122)
ature sensor
Programming Replace program-
unit faulty ming unit