Code Text display Description Recommendation
E00.17 DHW sensor Closed Domestic Hot Water tank
temperature sensor is either shorted
or measures a temperature above
range
Calorifier sensor short-circuited:
Bad connection: check the wiring and connec
tors.
Faulty sensor: replace the sensor.
E00.44 TcombiDhwOutOpen Domestic hot water outlet
temperature sensor is either
removed or measures a temperature
below range
DHW temperature sensor open:
Bad connection: check the wiring and connec
tors.
Faulty sensor: replace the sensor
E00.45 DHWoutSens short cct Domestic hot water outlet
temperature sensor is either shorted
or measures a temperature above
range
DHW temperature sensor short-circuited:
Bad connection: check the wiring and connec
tors.
Faulty sensor: replace the sensor
E01.04 5x Flame Loss Error 5x Error of unintended Flame Loss
occurance
Flame loss occurs 5 times:
Purge the gas supply to remove air.
Check whether the gas tap is properly open.
Check the gas supply pressure.
Check the operation and setting of the gas
valve unit.
Check that the air inlet and flue gas discharge
flues are not blocked.
Check that there is no recirculation of flue
gases.
E01.11 Fan Out Of Range Fan speed has exceeded normal
operating range
Fan fault:
Bad connection: check the wiring and connec
tors.
Faulty fan: replace the fan
Fan operates when it should not be operating:
check for excessive chimney draught
E01.12 Return Higher Flow Return tempearture has a higher
temperature value than the flow
temperature
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.
E01.24 Combustion Error Several combustion errors occurs
with 24 hours
Too many errors reset:
Switch the appliance off and on.
E02.13 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.
E02.15 Ext CSU Timeout External CSU Timeout CSU time out:
Bad connection: check the wiring and connec
tors.
Faulty CSU: replace CSU.
E02.17 GVC CommTimeout Gas Valve Control unit
communication has exceeded
feedback time
Communication error with the security kernel
Restart boiler
Replace the CU-GH08 control panel
E02.32 AF comm err Auto filling installation
communication has exceeded
feedback time
Refilling the installation takes too long:
Check the system for leaks.
Check the water pressure in the system.
Check that the inlet gas valve is fully open.
Check that the main water valve is fully open.
Check the operation of the pressure sensor.
Check the operation of the safety valve.
11 Troubleshooting
118 AMC 7686707 - v.01 - 06092018
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