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Code Display text Description Solution
H.02.09 Partial block Partial blocking of the device recog
nized
Blocking input active or frost protection active:
External cause: remove external cause
Wrong parameter set: check the parameters
Bad connection: check the connection
H.02.10 Full Block Full blocking of the device recog
nized
Blocking input is active (without frost protection):
External cause: remove external cause
Wrong parameter set: check the parameters
Bad connection: check the connection
H.02.12 Release Signal Release Signal input of the Control
Unit from device external environ
ment
Waiting time release signal has elapsed:
External cause: remove external cause
Wrong parameter set: check the parameters
Bad connection: check the connection
H.02.18 OBD Error Object Dictionary Error Reset CN1 and CN2
See
The data plate for the CN1 and CN2
values.
H.02.36 Funct device lost Functional device has been discon
nected
Communication error with the SCB PCB:
Bad connection with BUS: check the wiring.
No PCB: reconnect PCB or retrieve from mem
ory using auto-detect.
H.02.48 Funct Gr Conf Fault Function Group Configuration Fault SCB not found:
Carry out an auto-detect
H.02.50 Funct Gr Comm Err Function Group Communication Er
ror
SCB not found:
Carry out an auto-detect.
H.03.00 Parameter Error Safety parameters level 2, 3, 4 are
not correct or missing
Parameter error: security kernel
Restart the boiler
Replace the CU-GH
H.03.01 CU to GVC data error No valid data from CU to GVC re
ceived
Communication error with the CU-GH:
Restart the boiler
H.03.02 Flame loss detected Measured ionisation current is below
limit
No flame during operation:
No ionisation current:
Vent the gas supply to remove air
Check that the gas valve is fully opened
Check the gas supply pressure
Check the operation and setting of the gas
valve unit
Check that the air supply inlet and flue gas
outlet are not blocked
Check that there is no recirculation of flue
gases
H.03.05 Internal blocking Gas Valve Control internal blocking
occured
Security kernel error:
Restart the boiler
Replace the CU-GH
10 Troubleshooting
7701838 - v.09 - 10122021 51
51


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