
Code Faults
Cause
of the
fault
Description
Checking / solution
D07
AUX.SENS.FAIL.
SCU
Auxiliary sensor fault
Bad connection
4
Check whether the sensor is connected:
¼
See chapter: "Deletion of sensors from the
4
Check the link and the connectors
4
Check that the sensor has been correctly fitted
Sensor fault
4
Check the Ohmic value of the sensor
4
Replace the sensor if necessary
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
4
Check whether the sensor is connected:
¼
See chapter: "Deletion of sensors from the
4
Check the link and the connectors
4
Check that the sensor has been correctly fitted
Sensor fault
4
Check the Ohmic value of the sensor
4
Replace the sensor if necessary
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
4
Check whether the sensor is connected:
¼
See chapter: "Deletion of sensors from the
4
Check the link and the connectors
4
Check that the sensor has been correctly fitted
Sensor fault
4
Check the Ohmic value of the sensor
4
Replace the sensor if necessary
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 fault
Note:
The hot water storage tank
reheating operation is no
longer assured.
Bad connection
4
Check whether the sensor is connected:
¼
See chapter: "Deletion of sensors from the
4
Check the link and the connectors
4
Check that the sensor has been correctly fitted
Sensor fault
4
Check the Ohmic value of the sensor
4
Replace the sensor if necessary
AGC 10/15 - AGC 15 - AGC 25 - AGC 35
8. Troubleshooting
20/01/2012 - 300026081-001-B
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