Viessmann VITOTRONIC 200 Service Instructions Manual page 90

Troubleshooting
Diagnosis (service scans)
Line "A [–]"
Col- Explanation
umn
2 Fault message output, refrigerant circuit (external or internal unit).
Requirement: Refrigerant circuit fault, internal unit (column 1 set to "4")
or fault message, refrigerant circuit, external unit (column 3 set to "1").
"0" OFF.
3 Fault message, refrigerant circuit, external unit at heat pump control
unit:
"0" Disabled.
4 Power supply, external unit:
"0" No mains voltage.
5 Fault, compressor control
Note
A fault in the compressor control results in the compressor being shut
down.
"0" No fault.
"1" Fault, compressor overcur-
rent sensor.
"2" Excessive compressor power
consumption.
"3" Excessive heat sink tempera-
ture, DC inverter.
"4" Excessive heat sink tempera-
ture rise, DC inverter.
"5" Inadequate DC inverter volt-
age.
90
(cont.)
"1"
"1"
"1"
"6"
"7"
"8"
"9"
"10"
"11"
ON.
Active.
Mains voltage available.
Excessive DC inverter volt-
age.
Communication fault.
Fault current.
No mains voltage.
Reset control processor.
Synchronisation fault.