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Code Display text Description Solution
H.01.14 Max Tflow Flow temperature has exceeded the
maximum operating value
Flow temperature sensor above normal range:
Bad connection: check the wiring and connec
tors
No flow or insufficient flow:
Check the circulation (direction, pump,
valves)
Check the water pressure
Check the cleanliness of the heat exchanger
H.01.15 Max Tflue Gas Flue gas temperature has exceeded
the maximum operating value
Maximum flue gas temperature exceeded:
Check the flue gas outlet system
Check the heat exchanger to ensure that the
flue gas side is not clogged
Faulty sensor: replace the sensor
H.01.21 Dhw Temp GradLevel3 Maximum Dhw Temperature Gradi
ent Level3 Exceeded
The flow temperature has risen too fast:
Check the flow (direction, pump, valves)
Check that the pump is operating correctly
H.02.00 Reset In Progress Reset In Progress Reset procedure active:
No action
H.02.02 Wait Config Number Waiting For Configuration Number Configuration error or unknown configuration
number:
Reset CN1 and CN2
H.02.03 Conf Error Configuration Error Configuration error or unknown configuration
number:
Reset CN1 and CN2
H.02.04 Parameter Error Parameter Error Factory settings incorrect:
Parameters are not correct:
Restart the boiler
Reset CN1 and CN2
Replace the CU-GH PCB
H.02.05 CSU CU mismatch CSU does not match CU type Configuration error:
Reset CN1 and CN2
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.02.31 AF needed Device requires Auto filling of the
water system due to low pressure
Refill the central heating system using the auto
matic (re)filling unit.
H.02.38 No water hardness No hardness of water -
H.02.70 HRU test error External heat recovery unit test
failed
Heat recovery unit non-return valve check failed:
Check the external heat recovery unit non-re
turn valve.
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
10 Troubleshooting
7684359 - v.11 - 13122021 59
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