Technical data

119
Troubleshooting – Vitocontrol-S, VD2/CT3/CM2
Faults displayed at the programming unit (continued)
Fault
code
System characteristics
Cause Remedy
9
99
92
22
2
Control mode
Only solar control unit fault codes
w
i
l
l
b
e
d
i
s
p
l
a
y
e
d
Short circuit
Collector temperature sensor
Check solar control unit sensor
9
99
93
33
3
O
n
l
y
s
o
l
a
r
c
o
n
t
r
o
l
u
n
i
t
f
a
u
l
t
c
o
d
e
s
will be displayed
Short circuit
Collector return temperature sensor
9
99
94
44
4
Short circuit
DHW tank temperature sensor
9
99
9a
aa
a
Open circuit
Collector temperature sensor
9
99
9b
bb
b
Open circuit
Collector return temperature sensor
9
99
9c
cc
c
Open circuit
DHW tank temperature sensor
9
99
9f
ff
f
Error
Solar control unit; displayed if an
error without fault code occurs at
solar control unit
Check solar control unit
A
AA
AA
AA
AA
AA
AA
AA
AA
AA
AA
AA
AA
AA
AA
AA
AF
FF
Fa
aa
ab
bb
b
Controlled operation, possibly DHW
tank cold
DHW heating configuration error:
Coding 55: 3 has been set, but
aJB not plugged-in
and/or
coding 4C: 1 and 4E: 1 not set
Insert plug aJB and check coding
a
aa
ac
cc
cm
mm
m
Control mode Return temperature control
configuration error:
Coding 0C: 1 has been set, but
aJA not plugged-in
and/or
coding 4E: 0 not set
Insert plug aJA and check coding
b
bb
b1
11
1
Communication error
Programming unit
Check connections and replace
programming unit if necessary
b
bb
b4
44
4
Emissions test mode Internal electronics fault
Check Printed Circuit Board and
r
e
p
l
a
c
e
i
f
n
e
c
e
s
s
a
r
y
b
bb
b5
55
5
Control mode
r
e
p
l
a
c
e
i
f
n
e
c
e
s
s
a
r
y
b
bb
b6
66
6
Constant mode Invalid hardware recognised Check coding address 92 (92: 184)
b
bb
ba
aa
a
Mixing valve closed Communication error
Mixing valve extension Printed
Circuit Board
Check Printed Circuit Board and
replace if necessary
5351 340 v1.4