Viessmann Vitodens 300 - Page 79

Displayed
fault c ode
Con-
st.
Weat -
her-
com-
p.
System
character-
istics
Cause Remedy
51 X X No DHW
heating
Cylinder tem-
perature sen-
sor 2/outlet
sensor lead
break
Check sensor s (se e
page 87)
59 X X No DHW
heating
Cylinder tem-
perature sen-
sor 2/outlet
sensor lead
break
Check sensor s (se e
page 87)
92 X X Control
mode
Solar: Colle c-
tor tempera-
ture sensor
shorted out
Check sensor
9A X X Control
mode
Collector tem-
perature sen-
sor lead break
Check sensor
93 X X Control
mode
Solar: Sensor
S3 shorted out
Check sensor
9b X X Control
mode
Sensor S 3
lead break
Check sensor
94 X X Control
mode
Solar: Cylinder
temperature
sensor
shorted out
Check sensor
9C X X Control
mode
Cylinder tem-
perature sen-
sor lead break
Check sensor
9F X X Control
mode
Solar control
unit fault me s-
sage
See solar control
unit service instruc-
tions
A7 X Control
mode
Faulty user
interface
Replace user inte r-
face
b0 X X Burner
blocked
Flue gas tem-
perature sen-
sor short
circuit
Check the flue gas
temperature sensor
(see page 89)
Checking and acknowledging faults (cont.)
79
Troubleshooting
5692 537 GB