Viessmann VITOTRONIC 050 - Page 27

27
Troubleshooting
Faults with fault display at the programming unit (cont.)
Fault
code
System characteristics
CauseCause Remedy
1
11
10
00
0
Activates after 0 ºC / 23 ºF
Outdoor temperature
Short circuit
Outdoor temperature sensor
Check outdoor temperature sensor
(see page 34); if the outdoor
t
e
m
p
e
r
a
t
u
r
e
i
s
t
a
k
e
n
f
r
o
m
B
U
S
,
s
e
t
1
11
18
88
8
O
u
t
d
o
o
r
t
e
m
p
e
r
a
t
u
r
e
Cable break
Outdoor temperature sensor
(
s
e
e
p
a
g
e
3
4
)
;
i
f
t
h
e
o
u
t
d
o
o
r
temperature is taken from BUS, set
coding 97 : 1
2
22
20
00
0
Mixing valve closes Short circuit
Supply temperature sensor
Check supply temperature sensor
(see page 33)
2
22
28
88
8
Cable break
Supply temperature sensor
(
s
e
e
p
a
g
e
3
3
)
7
77
70
00
0
Outdoor reset logic control unit
without return temperature sensor
Short circuit
Return temperature sensor
Check return temperature sensor
(see page 33); without return
t
e
m
p
e
r
a
t
u
r
e
s
e
n
s
o
r
s
e
t
c
o
d
i
n
g
7
77
78
88
8
w
i
t
h
o
u
t
r
e
t
u
r
n
t
e
m
p
e
r
a
t
u
r
e
s
e
n
s
o
r
Cable break
Return temperature sensor
(
s
e
e
p
a
g
e
3
3
)
;
w
i
t
h
o
u
t
r
e
t
u
r
n
temperature sensor set coding
4b : 0
b
bb
b1
11
1
Control mode Communication fault
Programming unit
Check connections and replace
programming unit if necessary
b
bb
b4
44
4
Undefined control characteristics Internal electronics fault Replace printed circuit board
b
bb
bC
CC
C5
55
5
Control mode
b
bb
b6
66
6
Undefined control characteristics Invalid hardware recognized Check the control software circuit
board and confirm the coding address:
- Enter coding 2 (see page 41 for
instructions).
- Change code 8A to 176.
- Confirm coding 92:180
b
bb
bC
CC
Cc
cc
c
Control mode without remote
control
Communication fault
remote control Vitotrol
Check connections, cable, coding
address A0 and remote control DIP
switch (see page 35)
b
bb
bd
dd
d
Control mode DIP switch at the remote control
i
n
c
o
r
r
e
c
t
l
y
s
e
t
Adjusting DIP switches
(
s
e
e
p
a
g
e
3
6
)
b
bb
be
ee
e
i
n
c
o
r
r
e
c
t
l
y
s
e
t
(
s
e
e
p
a
g
e
3
6
)
b
bb
bf
ff
f
Incorrect LON communication
module
Replace communication module
(see parts list)
c
cc
c4
44
4
Faulty communication with output
extension module 0 to 10 V
Check connections and
cables/leads; if required replace
function extension (see page 38)
c
cc
cf
ff
f
LON communication module fault Replace communication module
(see parts list)
d
dd
da
aa
a
Control mode without room
influence
Room temperature sensor short
circuit
Check room temperature sensor
(see page 37) and DIP switch on
V
i
t
o
t
r
o
l
(
s
e
e
p
a
g
e
3
6
)
d
dd
dd
dd
d
i
n
f
l
u
e
n
c
e
Room temperature sensor cable
break
(
s
e
e
p
a
g
e
3
7
)
a
n
d
D
I
P
s
w
i
t
c
h
o
n
Vitotrol (see page 36)
E
EE
Ee
ee
e0
00
0
Control mode Cable break Viessmann 2-wire BUS
communication module
Check connection
5285 967 v1.2