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Code Messages Description Checking / solution
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
BL.COM PCU-D4
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
B22 BL.FLAME LOS
No flame during operation No ionization current
4 Check that the gas valve is fully opened
4 Contact the professional who takes care of
maintenance of the appliance
B25
BL.SU ERROR
Internal error on the SU PCB
4 Contact the professional who takes care of
maintenance of the appliance
B26 BL.DHW. S.
The DHW tank sensor is
disconnected or short circuited
4 Contact the professional who takes care of
maintenance of the appliance
6. Troubleshooting MCA 15 - MCA 25 MCA 25/28 MI
33
15/06/12 - 300022161-001-01
34


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