Code Messages Description Checking / solution
B04 BL.CS OPEN
Maximum heat exchanger
temperature increase has been
exceeded
The water flow in the installation is insufficient
4 Check the circulation (direction, pump, valves)
4 Check the water pressure
4 Check the cleanliness of the heat exchanger
Sensor error
4 Check that the sensors are operating correctly
4 Check whether the boiler sensor has been correctly fitted
B05
BL.DT EXCH.BACK
The maximum difference
between the exchanger
temperature and the return
temperature has been exceeded
The water flow in the installation is insufficient
4 Check the circulation (direction, pump, valves)
4 Check the water pressure
4 Check the cleanliness of the heat exchanger
Sensor error
4 Check that the sensors are operating correctly
4 Check whether the boiler sensor has been correctly fitted
B06
BL.DT BOI.EXC.
The maximum difference
between the boiler temperature
and the exchanger temperature
has been exceeded
The water flow in the installation is insufficient
4 Check the circulation (direction, pump, valves)
4 Check the water pressure
4 Check the cleanliness of the heat exchanger
Sensor error
4 Check that the sensors are operating correctly
4 Check whether the boiler sensor has been correctly fitted
B07
BL.DT OUTL RET.
Maximum difference between the
flow and return temperature
exceeded
The water flow in the installation is insufficient
4 Check the circulation (direction, pump, valves)
4 Check the water pressure
4 Check the cleanliness of the heat exchanger
Sensor error
4 Check that the sensors are operating correctly
4 Check whether the boiler sensor has been correctly fitted
B08
BL.RL OPEN
The RL inlet on the PCU PCB
terminal block is open
Parameter error
4 Set the type of generator again in the menu
#CONFIGURATION (Refer to the original rating plate)
Bad connection
4 Check the wiring
B09 BL.INV.L/N
Set the type of generator again in the menu #CONFIGURATION (Refer to the original rating
plate )
B10
B11
BL.SC.IN.OPEN
The BL inlet on the PCU PCB
terminal block is open
The contact connected to the BL inlet is open
4 Check the contact on the BL inlet
Parameter error
4 Check the parameter IN.BL
Bad connection
4 Check the wiring
B13 BL.COM PCU-D4
Communication error with the
SCU PCB
Bad connection
4 Check the wiring
SCU PCB not installed in the boiler
4 Install an SCU PCB
B14 BL.WATER MIS.
The water pressure is lower than
0,8 bar
Not enough water in the circuit
4 Top up the installation with water
Diematic iSystem For C 330 / C 630 ECO 7. Troubleshooting
31082018 - 7600691-001-06
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