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Code Display text Description Solution
E.00.40 WaterPressureOpen Water pressure sensor is either re
moved or measures a temperature
below range
Hydraulic pressure 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.
E.00.41 WaterPressureClosed Water pressure sensor is either
shorted or measures a temperature
above range
Hydraulic pressure 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.01.04 5x Flame Loss Error 5x Error of unintended Flame Loss
occurance
Flame loss occurs 5 times:
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 out
let are not blocked
Check that there is no recirculation of flue
gases
E.01.12 Return Higher Flow Return tempearture has a higher
temperature value than the flow tem
perature
Flow and return reversed:
Bad connection: check the wiring and connec
tors
Water circulation in wrong direction: check the
circulation (direction, pump, valves)
Incorrectly fitted sensor: check that the sensor
has been correctly fitted
Malfunctioning sensor: check the Ohmic value
of the sensor
Faulty sensor: replace the sensor
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.02.52 Gvc Burner Prof Err Gvc Burner Profile Error -
10 Troubleshooting
7701838 - v.09 - 10122021 53
53


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