Viessmann Cascade control unit - Sensor Resistance Table

34
Troubleshooting
Faults indicated in the "Faults" menu (cont.)
Cause: The room temperature is too low to
ensure frost protection
Result: The control unit creates a heat
demand
Remedy: Check system components
Cause: At least one boiler is in a fault state
(multi-boiler control unit)
Result: Output possibly too low
Remedy: Check the boiler (see VitodensĂ200
service instructions)
Cause: Communication error
Remedy: Check KM BUS connection
Cause: Communication error
Remedy: Check BUS connection
Cause: Faulty BUS user 2
Remedy: See VitotronicĂ050 service
instructions
Sensor resistance table
Temp-
erature
[ºC]
Resis-
tance
[W]
Temp-
erature
[ºC]
Resis-
tance
[W]
Temp-
erature
[ºC]
Resis-
tance
[W]
Temp-
erature
[ºC]
Resis-
tance
[W]
ć15 36Ă475 15 7Ă885 45 2Ă185 75 739
ć10 27Ă665 20 6Ă245 50 1Ă801 80 627
ć5 21Ă166 25 5Ă000 55 1Ă493 85 535
0 16Ă325 30 4Ă028 60 1Ă244 90 457
5 12Ă695 35 3Ă265 65 1Ă041 95 393
10 9Ă995 40 2Ă663 70 876 100 339
5862Ă474ĂGB
Frost prot. room
Boiler
error code:
Boiler comm.
Comm. 2-wire BUS
2Ćwire BUS E2