DeDietrich AWHP-2 MIT-IN-2 iSystem Installation And Service Manual page 124

8. Troubleshooting
Code Faults
SYST.SENS.FAIL. SCU
D07
D09 DHW S.FAILURE
D11 ROOM S.A FAIL.
D12 ROOM S.B FAIL.
D13 ROOM S.C FAIL.
D14 MC COM.FAIL
D15 ST.TANK S.FAIL
122
Cause Description
of the
fault
System sensor fault
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.
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.
SCU Break in communication between the
SCU PCB and the radio module
SCU Storage tank sensor fault
Note:
The hot water storage tank reheating
operation is no longer assured.
AWHP-2 MIT-IN-2 iSystem
Checking / solution
Bad connection
Check whether the sensor is connected:
4
¼See chapter: "Deletion of
sensors from the memory in the
PCB", page 124
Check the link and the connectors
4
Check that the sensor has been correctly
4
fitted
Sensor fault
Check the Ohmic value of the sensor
4
Replace the sensor if necessary
4
Bad connection
Check whether the sensor is connected:
4
¼See chapter: "Deletion of
sensors from the memory in the
PCB", page 124
Check the link and the connectors
4
Check that the sensor has been correctly
4
fitted
Sensor fault
Check the Ohmic value of the sensor
4
Replace the sensor if necessary
4
Bad connection
Check whether the sensor is connected:
4
¼See chapter: "Deletion of
sensors from the memory in the
PCB", page 124
Check the link and the connectors
4
Check that the sensor has been correctly
4
fitted
Sensor fault
Check the Ohmic value of the sensor
4
Replace the sensor if necessary
4
Bad connection
Check the link and the connectors
4
Boiler module failure
Change the boiler module
4
Bad connection
Check whether the sensor is connected:
4
¼See chapter: "Deletion of
sensors from the memory in the
PCB", page 124
Check the link and the connectors
4
Check that the sensor has been correctly
4
fitted
Sensor fault
Check the Ohmic value of the sensor
4
Replace the sensor if necessary
4
25/06/2014 - 7616371-001-04