Code
Display text
Description
Solution
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
E.04.06
Max Flue temp
Measured flue temperature above
limit
-
E.04.07
TFlow Sensor
Deviation in flow sensor 1 and flow
sensor 2 detected
Flow temperature sensor deviation:
Bad connection: check the connection
Faulty sensor: replace the sensor
E.04.08
Safety input
Safety input is open
Air pressure differential switch activated:
Bad connection: check the wiring and connec
tors
Pressure in flue gas duct is or was too high:
Non-return valve does not open
Siphon blocked or empty
Check that the air supply inlet and flue gas
outlet are not blocked
Check the cleanliness of the heat exchanger
E.04.09
TFlue Sensor
Deviation in flue sensor 1 and flue
sensor 2 detected
Flue gas temperature sensor deviation:
Bad connection: check the connection
Faulty sensor: replace the sensor
E.04.10
Unsuccessful start
5 Unsuccessful burners starts detec
ted
Five failed burner starts:
No ignition spark:
Check the wiring between the CU-GH and
the ignition transformer
Check the ionisation/ignition electrode
Check breakdown to earth
Check the condition of the burner cover
Check the earthing
Replace the CU-GH
Ignition spark but no flame:
Vent the gas pipes to remove air
Check that the air supply inlet and flue gas
outlet are not blocked
Check that the gas valve is fully opened
Check the gas supply pressure
Check the operation and setting of the gas
valve unit
Check the wiring on the gas valve unit
Replace the CU-GH
Flame present, but ionisation has failed or is in
adequate:
Check that the gas valve is fully opened
Check the gas supply pressure
Check the ionisation/ignition electrode
Check the earthing
Check the wiring on the ionisation/ignition
electrode.
10 Troubleshooting
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