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Code Messages Description Checking / solution
B04 BL.SMOKE.TEMP
The maximum flue gas
temperature has been exceeded.
If this message is generated 5
times in 24 hours, the boiler locks
down in L31.
4 Contact the professional who takes care of
maintenance of the appliance.
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 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.
B12 BL.SMOKE.PRES
The flue gas pressure switch is
open. If this message is generated
5 times in 24 hours, the boiler locks
down in L30.
4 Contact the professional who takes care of
maintenance of the appliance.
B13 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 (0.08 MPa)
Not enough water in the circuit
4 Top up the installation with water
B15 BL.GAS PRESS
Internal fault
4 Contact the professional who takes care of
maintenance of the appliance.
B16 BL.BAD SU
Incorrect configuration
4 Contact the professional who takes care of
maintenance of the appliance.
B17 BL.BAD PSU
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 integrated in the PCU is
not recognised
Wrong PSU 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 (Burner control
and safety box)
Bad connection
4 Contact the professional who takes care of
maintenance of the appliance.
B22 BL.PARAM.BURNER
Wrong burner parameters
4 Contact the professional who takes care of
maintenance of the appliance.
B23 BL. VOLTAGE <190V
Mains voltage too low
4 Contact the professional who takes care of
maintenance of the appliance.
B25 BL.OUTSIDE.S
The outside temperature sensor
connected to the PCU has been
disconnected
4 Switch the boiler off and switch back on.
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
B27 BL.DHW INST
The sensor on the plate exchanger
outlet is disconnected or short
circuited
4 Contact the professional who takes care of
maintenance of the appliance
7. Troubleshooting AFC 18 - AFC 24 - AFC 30
35
15/07/2015 - 300026440-05
36


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