DE DIETRICH AFC 18 - AFC 24 - AFC 30 - Manual (Page 37)

Code Faults Cause
of the
fault Description Checking / solution
D05 OUTSI.S.FAIL. SCU Outside temperature sensor fault
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 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 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 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 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
D16 SWIM.B S.FAIL
SWIM.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
D19 SOL.COL.S.FAIL SCU Header sensor fault Bad connection.
Sensor fault.
4
Contact the professional who takes care of
maintenance of the appliance
D20 SOL COM.FAIL SCU
4
Switch the boiler off and switch back on
4
Contact the professional who takes care of maintenance of the appliance
AFC 18 - AFC 24 - AFC 30 6. Troubleshooting
09/01/2014 - 300026440-001-03 36