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6 Troubleshooting
6.1 Anti-hunting
When the boiler is in Anti-short-cycle operating mode, the symbol ?
flashes.
1. Press the "?" key.
The message Operation assured when the restart temperature
will be reached is displayed.
This message is not an error message but an item of
information.
6.2 Messages (Code type Bxx or Mxx)
In the case of failure, the control panel displays a 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. Switch the boiler off and switch back on.
The boiler starts up again automatically when the reason for the
blocking has been removed.
3. If the code is displayed again, correct the problem by following the
instructions in the table below:
Code
Messages Description Checking / solution
B00 BL.CRC.PSU
The PSU PCB is incorrectly
configured
Parameter error on the PSU PCB
4 Contact the professional who takes care of
maintenance of the appliance
B01 BL.MAX BOILER
Maximum flow temperature
exceeded
The water flow in the installation is insufficient
4 Check the circulation (direction, pump, valves)
B02 BL.HEATING SPEED
The increase in flow temperature
has exceeded its maximum limit
The water flow in the installation is insufficient
4 Check the circulation (direction, pump, valves)
4 Check the water pressure
Sensor error
4 Contact the professional who takes care of
maintenance of the appliance
B07 BL.DT OUTL RET.
Maximum difference between
the flow and return temperature
exceeded
The water flow in the installation is insufficient
4 Check the circulation (direction, pump, valves)
4 Check the water pressure
Sensor error
4 Contact the professional who takes care of
maintenance of the appliance
MCA 15 - MCA 25 MCA 25/28 MI 6. Troubleshooting
15/06/12 - 300022161-001-01
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