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8. Troubleshooting
Code Messages
B22
BL.FLAME LOS
B25
BL.SU ERROR
B26
BL.DHW. S.
B27
BL.DHW INST
M04
REVISION
M05
REVISION A
M06
REVISION B
M07
REVISION C
M20
DISGAS
FL.DRY.B XX DAYS
FL.DRY.C XX DAYS
FL.DRY.B+C XX DAYS
M23
CHANGE OUTSI.S
M30
BL.COM.MODBUS
M31
BL.SYSTEM
NETWORK
STOP N XX
106
Description
No flame during operation
Internal error on the SU PCB 4
The DHW tank sensor is
disconnected or short circuited
The sensor on the plate
exchanger outlet is
disconnected or short circuited
A service is required
An A, B or C service is required The date programmed for the service has been reached
A boiler vent cycle is underway Switching the boiler on
Floor drying is active
XX DAYS = Number of days'
floor drying remaining.
The outside temperature
sensor is defective.
No communication with the
master regulation by the
network MODBUS.
Incorrect configuration of the
network MODBUS.
The shutdown is active
XX = Number of the active
shutdown
Checking / solution
No ionization current
Purge the gas supply to remove air
4
Check that the gas valve is fully opened
4
Check the supply pressure
4
Check the operation and setting of the gas valve unit
4
Check that the air inlet and flue gas discharge flues are
4
not blocked
Check that there is no recirculation of flue gases
4
Replace the SU PCB
Set the type of generator again in the menu
4
#CONFIGURATION (See nameplate)
Check that the sensor is actually connected to the
4
P.DHW inlet on the SCU
Check the Ohmic value of the sensor. Replace it if
4
necessary
Check the wiring
4
Set the type of generator again in the menu
4
#CONFIGURATION (See nameplate)
Check that the sensor is actually connected to the X20
4
inlet on the PCU
Check the Ohmic value of the sensor. Replace it if
4
necessary
Check the wiring
4
The date programmed for the service has been reached
Carry out maintenance on the boiler
4
To clear the inspection, programme another date in the
4
menu #REVISION or set the parameter REVISION
TYPE to OFF
Carry out maintenance on the boiler
4
To clear the inspection, press key t
4
Wait 3 minutes
4
Floor drying is underway. Heating on the circuits not concerned
is shut down.
Wait for the number of days shown to change to 0
4
Set the parameter SCREED DRYING to OFF
4
Change the outside radio temperature sensor.
Check the wiring between the module and the master
appliance.
Check that the address of the appliance is correctly
4
configured in the #NETWORK menu.
Check that the cascade configuration is set correctly on
4
the master module.
A shutdown is underway. The circuits selected for this stop are
in Antifreeze mode during the period chosen.
Wait until the end date has been passed
4
Set the parameter STOP NXX to OFF
4
MCA 35
15/06/12 - 300022160-001-01
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