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Code Display text Description Solution
E.02.04 Parameter Error Parameter Error Configuration error:
Reset CN1 and CN2
See
The data plate for the CN1 and CN2
values.
E.02.13 Blocking Input Blocking Input of the Control Unit
from device external environment
Blocking input is active:
External cause: remove external cause
Wrong parameter set: check the parameters
E.02.15 Ext CSU Timeout External CSU Timeout CSU time out:
Bad connection: check the wiring and connec
tors
Faulty CSU: Replace CSU
E.02.17 GVC CommTimeout Gas Valve Control unit communica
tion has exceeded feedback time
Communication error with the security kernel:
Restart the boiler
Replace the CU-GH
E.02.35 Safety device lost Safety critical device has been dis
connected
Communication fault
Carry out an auto-detect
E.02.47 Failed Conn Funct Gr Failed Connecting Function Groups Function group not found:
Carry out an auto-detect
Restart the boiler
Replace the CU-GH
E.02.48 Funct Gr Conf Fault Function Group Configuration Fault SCB not found:
Carry out an auto-detect.
E.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.
E.04.00 Parameter error Safety parameters Level 5 are not
correct or missing
Replace the CU-GH.
E.04.01 TFlow Closed Flow temperature sensor is either
shorted or measuring a temperature
above range
Flow 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
E.04.02 TFlow Open Flow temperature sensor is either
removed or measuring a tempera
ture below range
Flow temperature sensor open:
Bad connection: check the wiring and connec
tors
Faulty sensor: replace the sensor
E.04.03 Max Flow temp Measured flow temperature above
savety limit
No flow or insufficient flow:
Check the circulation (direction, pump, valves)
Check the water pressure
Check the cleanliness of the heat exchanger
E.04.04 TFlue Closed Flue temperature sensor is either
shorted or measuring a temperature
above range
Flue gas 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
E.04.05 TFlue Open Flue temperature sensor is either re
moved or measuring a temperature
below range
Flue gas 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
10 Troubleshooting
7734324 - v.06 - 01102021 75
75


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