Code
Display text
Description
Solution
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.03.17
Safety check
Periodically safety check ongoing
Safety check procedure active:
No action
10.1.3 Blocking
Tab.66 Blocking codes
Code
Display text
Description
Solution
H.00.16
DHW sensor Open
Domestic Hot Water tank tempera
ture sensor is either removed or
measures a temperature below
range
Domestic hot water temperature sensor open:
Sensor is not present
Incorrectly fitted sensor: check that the sensor
has been correctly fitted
Bad connection: check the wiring and connec
tors
Faulty sensor: replace the sensor
H.00.17
DHW sensor Closed
Domestic Hot Water tank tempera
ture sensor is either shorted or
measures a temperature above
range
Domestic hot water temperature sensor short-
circuited:
Incorrectly fitted sensor: check that the sensor
has been correctly fitted
Bad connection: check the wiring and connec
tors
Faulty sensor: replace the sensor
H.00.36
T 2nd Return Open
Second return temperature sensor is
either removed or measures a tem
perature below range
Second return temperature sensor open:
Bad connection: check the wiring and connec
tors.
Incorrectly fitted sensor: check that the sensor
has been correctly fitted.
Faulty sensor: replace the sensor.
H.00.37
T 2nd Return Closed
Second return temperature sensor is
either shorted or measures a tem
perature above range
Second return temperature sensor short-circuit
ed:
Bad connection: check the wiring and connec
tors.
Incorrectly fitted sensor: check that the sensor
has been correctly fitted.
Faulty sensor: replace the sensor.
H.01.00
Comm Error
Communication Error occured
Communication error with the security kernel:
Restart the boiler
Replace the CU-GH
10 Troubleshooting
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