8 Troubleshooting
8.1 Blocking
A (temporary) blocking mode is a boiler status, resulting from an abnormal
state. The display shows a blocking code (for example
) to
gether with the symbol. The control unit makes a number of attempts to
start the boiler again.
Note
The boiler automatically returns to operation once the cause of the
blocking has been removed.
8.1.1 Blocking codes
Tab.9
Blocking codes
Blocking code
Description
Communication error with the CU-GH PCB:
Restart boiler
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
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
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 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
Gas pressure too low:
Gas pressure too low:
Check the gas supply pressure
Check that the gas valve is fully opened
Wiring fault: check the wiring
Faulty gas valve: check the gas valve and replace it if necessary
Maximum heat exchanger temperature exceeded:
Check the circulation (direction, pump, valves)
Check the water pressure
Check that the sensors are operating correctly
Check that the sensor has been fitted properly
Check the cleanliness of the heat exchanger
Check that the installation has been correctly vented to remove air
8 Troubleshooting
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7616014 - v.03 - 15022016
