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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.10.00
T Flow Zone A Open
Flow temperature sensor Zone A
Open
Flow temperature sensor zone A open:
Bad connection: check the wiring and connec
tors
Incorrectly fitted sensor: check that the sensor
has been correctly fitted
Sensor is not present.
Faulty sensor: replace the sensor
H.10.01
T Flow Zone A Closed
Flow temperature sensor Zone A
Closed
Flow temperature sensor zone A 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
H.10.02
T Dhw Zone A Open
Domestic Hot Water temperature
sensor Zone A Open
Domestic hot water temperature sensor zone A
open:
Bad connection: check the wiring and connec
tors
Incorrectly fitted sensor: check that the sensor
has been correctly fitted
Sensor is not present.
Faulty sensor: replace the sensor
H.10.03
T Dhw Zone A Closed
Domestic Hot Water temperature
sensor Zone A Closed
Domestic hot water temperature sensor zone A
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
When using thermostat instead of sensor: pa
rameter CP500 must be set to off (=disable)
H.10.04
TSwimmPoolZoneA
Open
Swimming Pool Temperature Sen
sor Zone A Open
Swimming pool temperature sensor A open:
Bad connection: check the wiring and connec
tors
Incorrectly fitted sensor: check that the sensor
has been correctly fitted
Sensor is not present.
Faulty sensor: replace the sensor
H.10.05
TSwimmPoolZoneA
Close
Swimming Pool Temperature Sen
sor Zone A Closed
Swimming pool temperature sensor zone A 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
12 Troubleshooting
7762666 - v.02 - 29092020
C 340 / C 640
167