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Code Messages Description Checking / solution
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
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
M04 REVISION
A service is required The date programmed for the service has been reached
4 If the symbol ? flashes, press key ?. The installer's contact
details are displayed.
4 Contact the professional who takes care of maintenance of
the appliance
M05 REVISION A
An A, B or C service is required The date programmed for the service has been reached
4 If the symbol ? flashes, press key ?. The installer's contact
details are displayed.
4 Contact the professional who takes care of maintenance of
the appliance
M06
REVISION B
M07 REVISION C
M20 DISGAS
A boiler vent cycle is underway Switching the boiler on
4 Wait 3 minutes
FL.DRY.B XX
DAYS
Floor drying is active
XX DAYS = Number of days' floor
drying remaining.
Floor drying is underway. Heating on the circuits not concerned
is shut down.
4 Contact the professional who takes care of maintenance of
the appliance
FL.DRY.C XX
DAYS
FL.DRY.B+C XX
DAYS
M23 CHANGE OUTSI.S
The outside temperature sensor is
defective.
Change the outside radio temperature sensor.
STOP N XX
The shutdown is active
XX = Number of the active
shutdown
A shutdown is underway. The circuits selected for this stop are
in Antifreeze mode during the period chosen.
MCA 45 - 65 - 90 - 115 7. Troubleshooting
28/08/12 - 300024828-001-01
44
45


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