Code Faults Cause
of the
error
Description Checking / solution
D05 OUTSI.S.FAIL.
SCU Fault external sensor
Remarks:
The boiler operates on BOILER
MAX temperature.
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 AUX.SENS.FAIL.
SCU Auxiliary sensor failure 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 failure
Remarks:
Heating of domestic hot water is no
longer ensured.
The load pump operates.
The load temperature of the dhw
tank is the same as the boiler.
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 Fault room temperature sensor A
Fault room temperature sensor B
Fault room temperature sensor C
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 Communication failure between the
SCU PCB and the boiler 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 failure
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 failure circuit
B
Swimming pool sensor failure circuit
C
Note:
Pool reheating is independent of its
temperature.
Bad connection
Sensor fault
4 Contact the professional who takes care of
maintenance of the appliance
D17 DHW 2 S.FAIL
SCU Sensor failure tank 2 Bad connection
Sensor fault
4 Contact the professional who takes care of
maintenance of the appliance
D27 PCU COM. FAIL
SCU Communication failure between the SCU and PCU PCBs
4 Contact the professional who takes care of maintenance of the appliance
MCA 45 - 65 - 90 - 115 7. Troubleshooting
06/09/2010 - 300024828-001-A
48
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