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Code Display text Description Solution
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.
E.04.11 VPS VPS Gas Valve proving failed Gas leakage control fault:
Bad connection: check the wiring and connec
tors
Gas leakage control VPS faulty: Replace the
valve proving system (VPS)
Gas valve unit faulty: Replace the gas valve
unit
E.04.12 False flame False flame detected before burner
start
False flame signal:
The burner remains very hot: Set the O2
Ionisation current measured but no flame
should be present: check the ionisation/ignition
electrode
Faulty gas valve: replace the gas valve
Faulty ignition transformer: replace the ignition
transformer
10 Troubleshooting
76 7734324 - v.06 - 01102021
76


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