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Troubleshooting
Faults indicated in the "Faults" menu
Frost prot. room
Boiler
error code:
Boiler comm.
Comm. 2-wire BUS
2 wire BUS
Sensor resistance table
Temp-
Resis-
erature
tance
[ºC]
[W]
15 36 475
10 27 665
5 21 166
0 16 325
5 12 695
10
9 995
34
Cause:
Result:
Remedy:
Cause:
Result:
Remedy:
Cause:
Remedy:
Cause:
Remedy:
Cause:
E2
Remedy:
Temp-
Resis-
erature
tance
[ºC]
[W]
15
7 885
20
6 245
25
5 000
30
4 028
35
3 265
40
2 663
(cont.)
The room temperature is too low to
ensure frost protection
The control unit creates a heat
demand
Check system components
At least one boiler is in a fault state
(multi-boiler control unit)
Output possibly too low
Check the boiler (see Vitodens 200
service instructions)
Communication error
Check KM BUS connection
Communication error
Check BUS connection
Faulty BUS user 2
See Vitotronic 050 service
instructions
Temp-
Resis-
erature
tance
[ºC]
[W]
45
2 185
50
1 801
55
1 493
60
1 244
65
1 041
70
876
Temp-
Resis-
erature
tance
[ºC]
[W]
75
739
80
627
85
535
90
457
95
393
100
339
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