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Code Faults Cause
of the
fault
Description Checking / solution
D03
D04
OUTL S.B FAIL.
OUTL S.C FAIL.
SCU Circuit B flow sensor fault
Circuit C flow sensor fault
Remarks:
The circuit pump is running.
The 3-way valve motor on the circuit is no
longer powered and can be adjusted
manually.
Bad connection
Sensor fault
4 Contact the professional who takes
care of maintenance of the appliance
D05 OUTSI.S.FAIL.
SCU Outside temperature sensor fault
Remarks:
The set point is equal to the MAX MIT
parameter.
The valve setting is no longer ensured but
monitoring the maximum temperature of the
circuit after the valve is ensured.
Valves may be manually operated.
Reheating the domestic hot water remains
ensured.
Bad connection
Sensor fault
4 Contact the professional who takes
care of maintenance of the appliance
D07 SYST.SENS.FAIL.
SCU System sensor fault Bad connection
Sensor fault
4 Contact the professional who takes
care of maintenance of the appliance
D09 DHW S.FAILURE
SCU Domestic hot water sensor fault
Remarks:
Heating of domestic hot water is no longer
ensured.
The load pump operates.
The tank load temperature is equal to the
temperature of the inside module.
Bad connection
Sensor fault
4 Contact the professional who takes
care of maintenance of the appliance
D11
D12
D13
ROOM S.A FAIL.
ROOM S.B FAIL.
ROOM S.C FAIL.
SCU A room temperature sensor fault
B room temperature sensor fault
C room temperature sensor fault
Note:
The circuit concerned operates without any
influence from the room sensor.
Bad connection
Sensor fault
4 Contact the professional who takes
care of maintenance of the appliance
D14 MC COM.FAIL
SCU Break in communication between the SCU
PCB and the radio module
Bad connection
4 Check the link and the connectors
Boiler module failure
4 Change the boiler module
D15 ST.TANK S.FAIL
SCU Storage tank sensor fault
Note:
The hot water storage tank reheating
operation is no longer assured.
Bad connection
Sensor fault
4 Contact the professional who takes
care of maintenance of the appliance
D16
D16
SWIM.P.B. S.FAIL
SWIM.P.C. S.FAIL
SCU Swimming pool sensor fault circuit B
Swimming pool sensor fault circuit C
Note:
Swimming pool reheating is always done
during the circuit’s comfort period.
Bad connection
Sensor fault
4 Contact the professional who takes
care of maintenance of the appliance
D17 DHW 2 S.FAIL
SCU Sensor fault tank 2 Bad connection
Sensor fault
4 Contact the professional who takes
care of maintenance of the appliance
D18 ST.TANK S.FAIL
SCU Solar tank sensor fault Bad connection
Sensor fault
4 Contact the professional who takes
care of maintenance of the appliance
5. Troubleshooting AWHP MIT-IN iSystem
27
09/01/13 - 300027618-001-02
28


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