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Code
Display text
Description
Solution
A.00.34
TOutside Missing
Outside temperature sensor was ex
pected but not detected
Outdoor sensor not detected:
Outdoor sensor is not connected: Connect the
sensor
Outdoor sensor is not connected correctly:
Connect the sensor correctly
A.01.21
Dhw Temp GradLevel3 Maximum Dhw Temperature Gradi
ent Level3 Exceeded
Temperature warning:
Check the flow.
A.02.06
Water Press Warning
Water Pressure Warning active
Water pressure warning:
Water pressure too low; check the water pres
sure
A.02.37
Uncritic device lost
Uncritical device has been discon
nected
SCB not found:
Bad connection: check the wiring and connec
tors
Faulty SCB: Replace SCB
A.02.45
Full Can Conn Matrix
Full Can Connection Matrix
SCB not found:
Carry out an auto-detect
A.02.46
Full Can Device Adm
Full Can Device Administration
SCB not found:
Carry out an auto-detect
A.02.49
Failed Init Node
Failed Initialising Node
SCB not found:
Carry out an auto-detect
A.02.55
Inval or miss SerNR
Invalid or missing device serial num
ber
Contact your supplier.
A.02.76
Memory full
The reserved space in memory for
custom parameters value is full. No
more user changed possible
Configuration error:
Reset CN1 and CN2
Faulty CSU: Replace CSU
Replace the CU-GH
A.03.17
Safety check
Periodically safety check ongoing
Safety check procedure active:
No action
A.10.33
SDhwTopZoneD Open Domestic Hot Water tank top tem
perature sensor Zone DHW open
Domestic hot water top temperature sensor open:
Bad connection: check the wiring and connec
tors
Incorrectly fitted sensor: check that the sensor
has been correctly fitted
Sensor is not present.
Faulty sensor: replace the sensor
A.10.34
SDhwTopZoneD
Closed
Domestic Hot Water tank top tem
perature sensor Zone DHW Closed
Domestic hot water top temperature sensor
short-circuited:
Bad connection: check the wiring and connec
tors
Incorrectly fitted sensor: check that the sensor
has been correctly fitted
Faulty sensor: replace the sensor
A.10.45
RoomTempZoneA miss Measure of Room Temperature
Zone A is missing
Room temperature sensor not detected in zone
A:
Room temperature sensor is not connected:
connect the sensor
Room temperature sensor is not connected
correctly: connect the sensor correctly
Faulty sensor: replace the sensor
A.10.46
RoomTempZoneB miss Measure of Room Temperature
Zone B is missing
Room temperature sensor not detected in zone
B:
Room temperature sensor is not connected:
connect the sensor
Room temperature sensor is not connected
correctly: connect the sensor correctly
Faulty sensor: replace the sensor
12 Troubleshooting
7762666 - v.02 - 29092020
C 340 / C 640
161