DE DIETRICH MIT iSystem - Manual (Page 24)

5 Troubleshooting
5.1 Anti-hunting
When the heat pump is in "anti-short cycle" operating mode, the
symbol "?" flashes. This is a normal operating mode. When the restart
temperature is reached, operation will be guaranteed.
1. Press the "?" key.
The message Operation assured when the restart temperature
will be reached
is displayed. When the restart temperature is
reached, operation will be guaranteed.
This message is not an error message but an item of
information.
5.2 Messages
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 off heat pump and start up again.
The heat pump starts up again autonomously when the cause of
the failure has been lifted.
3. If the code is displayed again, correct the problem by following the
instructions in the table below:
Code Messages Description Checking / solution
B0 BL.PARAM.CRC Error parameters.
4 Switch off the mains supply to the installation
4 Switch back on
B1 BL.NO CONFIG The inside module has not been
configured.
The PSU PCB has been changed.
4 Contact the professional who takes care of maintenance
of the appliance.
B2 BL.MIT/MHR S. The MIT flow sensor is short
circuited or on an open circuit.
Bad connection.
4 Contact the professional who takes care of maintenance
of the appliance.
B3 BL.S.DEP.HP Heat pump flow sensor error. Bad connection.
4 Contact the professional who takes care of maintenance
of the appliance.
B4 BL.S.EXT.HP Source sensor error/heat pump
outside temperature sensor.
Bad connection.
4 Contact the professional who takes care of maintenance
of the appliance.
B5 BL.S.RET.HP Heat pump return sensor error. Bad connection.
4 Contact the professional who takes care of maintenance
of the appliance.
5. Troubleshooting MIT iSystem
23 24/05/2012 - 300028952-001-01