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Code Description Solution
A02.49 Failed Initialising Node SCB PCB not found:
Carry out an auto-detect
A03.17 Periodically safety check ongoing Safety check procedure active:
No action
11.1.2 Blocking - FSB-WHB-HE-150-300
Tab.47 Blocking codes
Code Description Solution
H00.36 Second return temperature sensor is either removed
or measures a temperature below range
Second 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.
H00.37 Second return temperature sensor is either shorted
or measures a temperature above range
Second 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.
H01.00 Communication Error occured Communication error with the security kernel:
Restart the boiler
Replace the CU-GH PCB
H01.06 Maximum difference between heat exchanger
temperature and flow temperature
Maximum difference between heat exchanger and
flow temperature exceeded:
No flow or insufficient flow:
Check the circulation (direction, pump, valves).
Check the water pressure.
Check the cleanliness of the heat exchanger.
Check that the installation has been correctly
vented to remove air.
Sensor error:
Check that the sensors are operating correctly.
Check that the sensor has been fitted properly.
H01.07 Maximum difference between heat exchanger
temperature and return temperature
Maximum difference between heat exchanger and
return temperature exceeded:
No flow or insufficient flow:
Check the circulation (direction, pump, valves).
Check the water pressure.
Check the cleanliness of the heat exchanger.
Check that the installation has been correctly
vented to remove air.
Sensor error:
Check that the sensors are operating correctly.
Check that the sensor has been fitted properly.
H01.08 Delta T Max 3 Maximum heat exchanger temperature increase has
been exceeded:
No flow or insufficient flow:
Check the circulation (direction, pump, valves)
Check the water pressure
Check the cleanliness of the heat exchanger
Check that the central heating system has been
correctly vented to remove air
Sensor error:
Check that the sensors are operating correctly
Check that the sensor has been fitted properly
11 Troubleshooting
7665063 - v.05 - 18102018 75
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