Code Messages Description Checking / solution
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
Sensor error
4 Contact the professional who takes care of maintenance of
the appliance
B08 BL.RL OPEN
The RL inlet on the PCU PCB
terminal block is open
Parameter error
4 Contact the professional who takes care of maintenance of
the appliance
Bad connection
4 Contact the professional who takes care of maintenance of
the appliance
B09 BL.INV. L/N
4 Contact the professional who takes care of maintenance of the appliance
B10
B11
BL.BL INPUT
OPEN
The BL inlet on the PCU PCB
terminal block is open
The contact connected to the BL inlet is open
4 Contact the professional who takes care of maintenance of
the appliance
Parameter error
4 Contact the professional who takes care of maintenance of
the appliance
Bad connection
4 Contact the professional who takes care of maintenance of
the appliance
B13 BL. PCU COM
Communication error with the
SCU PCB
Bad connection
4 Contact the professional who takes care of maintenance of
the appliance
SCU PCB not installed in the boiler
4 Contact the professional who takes care of maintenance of
the appliance
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
B15 BL.GAS PRESS
Gas pressure too low Incorrect setting of the gas pressure switch on the SCU PCB
4 Check that the gas valve is fully opened
4 Contact the professional who takes care of maintenance of
the appliance
B16
BL.BAD SU
The SU PCB is not recognised Wrong SU PCB for this boiler
4 Contact the professional who takes care of maintenance of
the appliance
B17 BL.PCU ERROR
The parameters saved on the
PCU PCB are impaired
Parameter error on the PCU PCB
4 Contact the professional who takes care of maintenance of
the appliance
B18 BL.BAD PSU
The PSU PCB is not recognised Wrong PSU PCB for this boiler
4 Contact the professional who takes care of maintenance of
the appliance
B19 BL.NO CONFIG
The boiler has not been
configured
The PSU PCB has been changed
4 Contact the professional who takes care of maintenance of
the appliance
B21 BL. COM SU
Communication error between
the PCU and SU PCBs
Bad connection
4 Contact the professional who takes care of maintenance of
the appliance
MCA 45 - 65 - 90 - 115 7. Troubleshooting
06/09/2010 - 300024828-001-A
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