DE DIETRICH MIT iSystem - Manual (Page 27)

5.3 Faults (Code type Lxx or Dxx)
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.
3. Press the ? key. Follow the instructions displayed to solve the
problem.
4. Consult the meaning of the codes in the table below:
Code Faults Description Checking / solution
L1 COMP.FAIL. No compressor rotation.
4 Contact the professional who takes care of maintenance
of the appliance.
L2 FAIL. PAC V4V Heat pump 4 way valve error.
4
Check that there is not an inversion between the flow and
return for the heating circuit.
4 Contact the professional who takes care of maintenance
of the appliance.
L3 FAIL. PAC PUMP Flow rate error between the heat
pump and MIT.
4 Contact the professional who takes care of maintenance
of the appliance.
L4 HP OUT LIMIT Under the lower operating limit.
4
Use the backups
L5 FLOW FAIL. 6 Exchanger frozen.
4
Contact the professional who takes care of maintenance
of the appliance.
L6 FLOW FAIL. 8 Exchanger frozen.
4
Contact the professional who takes care of maintenance
of the appliance.
L7 HP COM.FAIL No communication with the heat
pump.
4
Contact the professional who takes care of maintenance
of the appliance.
L8 HGAS S.HP FAIL Compressor outlet temperature
sensor error.
4 Contact the professional who takes care of maintenance
of the appliance.
L9 FAIL. H.P PAC High pressure error on the heat
pump.
4
Contact the professional who takes care of maintenance
of the appliance.
L10 DEF.B.P. HP Low-pressure error on the heat
pump.
4 Contact the professional who takes care of maintenance
of the appliance.
L14 DEF.ANTI.COND. Condenser anti-freezing error.
4
Contact the professional who takes care of maintenance
of the appliance.
L15 DEFROST FAIL. Defrosting mode error.
4
Contact the professional who takes care of maintenance
of the appliance.
L16 MOT.PROT.FAIL Compressor fault.
4
Contact the professional who takes care of maintenance
of the appliance.
L17 HGAS S.FAIL Hot gas fault.
4
Contact the professional who takes care of maintenance
of the appliance.
bar
1
1
2
2
D
STD
J
E
0 2 4 6 8 10 12 14 16 18 22 24 20
# F
AUTO % $
<
:  !
SUNDAY 11:45
TEMP. : 68°
PCU. COM. FAIL. D27
C002604-B-04
bar
1
1
2
2
D
STD
J I
E
0 2 4 6 8 10 12 14 16 18 22 24 20
# F
AUTO % $
<
:  !
SUNDAY 11:45
TEMP. : 68°
PCU COM.FAIL D27
C002302-D-04
MIT iSystem 5. Troubleshooting
24/05/2012 - 300028952-001-01 26