DeDietrich Innovens MCA 15, Installation And Service Manual

Page: 123 / 144

Faults Code Cause
of the
error
Description Checking / solution
AUX.SENS.FAIL. D07
SCU Auxiliary sensor failure Bad connection
4
Check whether the sensor is connected:
¼
See chapter: "Deletion of sensors from the
memory in the PCB", page 123
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
DHW S.FAILURE D09
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
4
Check whether the sensor is connected:
¼
See chapter: "Deletion of sensors from the
memory in the PCB", page 123
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
ROOM S.A FAIL.
ROOM S.B FAIL.
ROOM S.C FAIL. D11
D12
D13
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
4
Check whether the sensor is connected:
¼
See chapter: "Deletion of sensors from the
memory in the PCB", page 123
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
MC COM.FAIL D14
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
ST.TANK S.FAIL D15
SCU Storage tank sensor failure
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
memory in the PCB", page 123
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
MCA 15 - MCA 25 MCA 25/28 MI 8. Troubleshooting
29/04/2010 - 300022146-001-B 121