Technical data

117
Troubleshooting – Vitocontrol-S, VD2/CT3/CM2
Faults displayed at the programming unit (continued)
Fault display in plain text
Ext. fault
Outdoor temperature sensor
Supply sensor
Boiler 1 to 4
DHW tank sensor (1 or 2; display
only, if a second DHW tank
temperature sensor is connected)
Return sensor
Sensor 17A
Sensor 17B
Room temperature sensor
Flue gas sensor
Collector sensor
Solar DHW sensor
Participant No.
Participant fault (display only if
control unit is programmed as fault
manager)
Calling up acknowledged fault
messages
Press for approx. 3 seconds. The
fault will then be displayed.
Select the acknowledged fault
with or .
Fault
code
System characteristics
Cause Remedy
0
00
0f
ff
f
Control mode Maintenance
“0F” is only displayed in error
history
Carry out maintenance
Please note:
After maintenance, set coding 24: 0
1
11
10
00
0
Activates after 0˚C / 32˚F outdoor
temperature
Short circuit
Outdoor temperature sensor
Check outdoor temperature sensor
(see page 143)
1
11
18
88
8
t
e
m
p
e
r
a
t
u
r
e
Open circuit
Outdoor temperature sensor
2
22
20
00
0
Vitocontrol-S, VD2/CT3/CM2
controls in a stand-alone manner
w
/
o
s
u
p
p
l
y
t
e
m
p
e
r
a
t
u
r
e
s
e
n
s
o
r
Short circuit
Common supply temperature sensor
Check common supply temperature
sensor (see page 142)
2
22
28
88
8
w
/
o
s
u
p
p
l
y
t
e
m
p
e
r
a
t
u
r
e
s
e
n
s
o
r
(supply temperature may not be high
enough)
Open circuit
Common supply temperature sensor
4
44
40
00
0
Mixing valve closes Short circuit
Supply temperature sensor of
mixing valve circuit M2
Check supply temperature sensor
(see page 142)
4
44
44
44
4
Short circuit
Supply temperature sensor of
mixing valve circuit M3
4
44
48
88
8
Open circuit
Supply temperature sensor of
mixing valve circuit M2
5351 340 v1.4