Code
Description
Solution
H03.00
Safety parameters level 2, 3, 4 are not correct or
missing
Parameter error: security kernel
Restart the boiler
Replace the CU-GH PCB
H03.01
No valid data from CU to GVC received
Communication error with the CU-GH PCB:
Restart the boiler
H03.02
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
H03.05
Gas Valve Control internal blocking occured
Security kernel error:
Restart the boiler
Replace the CU-GH PCB
12.1.3 Lock-out - FSB-WHB-HE-150-300
Tab.44 Lock out codes
Code
Description
Solution
E00.00
Flow temperature sensor is either removed or
measures a temperature below range
Flow temperature sensor open:
Bad connection: check the wiring and connectors.
Incorrectly fitted sensor: check that the sensor has
been correctly fitted.
Faulty sensor: replace the sensor.
E00.01
Flow temperature sensor is either shorted or
measures a temperature above range
Flow temperature sensor short circuited:
Bad connection: check the wiring and connectors.
Incorrectly fitted sensor: check that the sensor has
been correctly fitted.
Faulty sensor: replace the sensor.
E00.04
Return temperature sensor is either removed or
measures a temperature below range
Return temperature sensor open:
Bad connection: check the wiring and connectors
Incorrectly fitted sensor: check that the sensor has
been correctly fitted
Faulty sensor: replace the sensor
E00.05
Return temperature sensor is either shorted or
measures a temperature above range
Return temperature sensor short-circuited:
Bad connection: check the wiring and connectors
Incorrectly fitted sensor: check that the sensor has
been correctly fitted
Faulty sensor: replace the sensor
E00.08
Heat exchanger temperature sensor is either
removed or measures a temperature below range
Heat exchanger temperature sensor open:
Bad connection: check the wiring and connectors.
Incorrectly fitted sensor: check that the sensor has
been correctly fitted.
Faulty sensor: replace the sensor.
E00.09
Heat exchanger temperature sensor is either shorted
or measures a temperature above range
Heat exchanger temperature sensor short-circuited:
Bad connection: check the wiring and connectors.
Incorrectly fitted sensor: check that the sensor has
been correctly fitted.
Faulty sensor: replace the sensor.
12 Troubleshooting
7625116 - v.06 - 17102018
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