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Code Messages Description Checking / solution
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.
M30 BL.COM.MODBUS
No communication with the
master regulation by the network
MODBUS.
Contact the professional who takes care of maintenance of
the appliance.
M31 BL.SYSTEM NETWORK
Incorrect configuration of the
network MODBUS.
Contact the professional who takes care of maintenance of
the appliance.
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.
6.3 Faults (Code type Lxx or Dxx)
In the event of operational failure, the control panel flashes and
displays an error message and a corresponding code.
1. Make a note of the code displayed.
The code is important for the correct and rapid diagnosis of the
type of failure and for any technical assistance that may be
needed.
2. Press the
t
key. If the code is displayed again, switch off the boiler
and then switch it back on.
bar
1
1
2
2
r
c
STD
(
t
v
0 2 4 6 8 10 12 14 16 18 22 2420
p
b
AUTO
x
c
r
j
M
g
m
SUNDAY 11:45
TEMP. : 68°
PCU. COM. FAIL. D27
C002604-B-04
MCA 35
6. Troubleshooting
15/06/12 - 300022163-001-01
34
35


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