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Code Display text Description Solution
H.03.02 Flame loss detected Measured ionisation current is below
limit
No flame during operation:
No ionisation current:
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
outlet are not blocked
Check that there is no recirculation of flue
gases
H.03.05 Internal blocking Gas Valve Control internal blocking
occured
Security kernel error:
Restart the boiler
Replace the CU-GH
H.03.17 Safety check Periodically safety check ongoing Restart the boiler
Replace the CU-GH
10.1.4 Locking
Tab.51 Locking codes
Code Display text Description Solution
E.00.04 TReturn Open Return temperature sensor is either
removed or measures a temperature
below range
Return 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.00.05 TReturn Closed Return temperature sensor is either
shorted or measures a temperature
above range
Return 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.00.06 TReturn Missing Return temperature sensor was ex
pected but not detected
No connection to temperature return sensor:
Bad connection: check the wiring and connec
tors.
Faulty sensor: replace the sensor
E.00.07 dTReturn Too High Return temperature difference is too
large
Difference between the flow and return tempera
tures too great:
No circulation:
Vent the central heating system to remove
air
Check the water pressure
If present: check the boiler type parameter
setting
Check the circulation (direction, pump,
valves)
Check that the heating pump is operating
correctly
Check the cleanliness of the heat exchanger
Sensor not connected or incorrectly connected:
Check that the sensors are operating correct
ly
Check that the sensor has been fitted proper
ly
Faulty sensor: replace the sensor if necessary
10 Troubleshooting
60 7684359 - v.11 - 13122021
60


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