Code
Message
Description
A02.22
System flow warning
System water flow warning active
A02.55
Inval or miss SerNR
Invalid or missing device serial number
A02.80
Missing Cascade Ctrl
Missing Cascade controller
6.1.6
SCB-10 warning codes
A warning code signals that the optimal operating conditions are not
fulfilled. The system continues to operate safely, but there is a risk of
shutdown if the situation continues to deteriorate.
If the situation improves, the warning code may disappear spontaneously.
When one of the codes below is displayed continuously, contact the
professional responsible for maintenance of the heat pump.
Tab.26 List of warning codes linked to the SCB-10 PCB
Code
Message
Description
A00.32
TOutside Open
Outside temperature sensor is either removed or measures a
temperature below range
A00.33
TOutside Closed
Outside temperature sensor is either shorted or measures a
temperature above range
A00.34
TOutside Missing
Outside temperature sensor was expected but not detected
A02.18
OBD Error
Object Dictionary Error:
A02.37
Uncritic device lost
Uncritical device has been disconnected:
A10.45
RoomTempZoneA miss
Measure of Room Temperature Zone A is missing
A10.46
RoomTempZoneB miss
Measure of Room Temperature Zone B is missing
A10.47
RoomTempZoneC miss
Measure of Room Temperature Zone C is missing
A10.50
T_DHW top D miss
Domestic Hot Water temperature sensor top zone DHW is
missing
A10.54
Temp. Zone DHW miss.
Temperature sensor Zone DHW is missing
A10.56
T_DHW Zone AUX miss
Domestic Hot Water temperature sensor Zone AUX is missing
6.2
Fault finding
Tab.27
Problems
Probable causes
Corrections
The radiators are cold. The heating setpoint tem
perature is too low.
Increase the value of the room temperature setpoint or, if a room unit is
connected, increase the temperature on it.
The heating mode is deac
tivated.
Activate the heating mode.
The radiator valves are
closed.
Open the valves on all radiators connected to the heating system.
The heat pump is not op
erating.
Check that the heat pump is switched on.
Check the fuses and switches on the electrical installation.
The water pressure is too
low (< 1 bar).
Top up the system with water.
6 Troubleshooting
7684505 - v04 - 10022022
MIT-S
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