Code Faults Cause
of the
fault
Description Checking / solution
L38 PCU COM.FAIL
PCU Communication failure between
the PCU and SCU PCBs
Bad connection
4 Check the wiring between the PCU and SCU
PCBs
4 Run an AUTODETECTION in the menu
#CONFIGURATION
SCU PCB not connected or faulty
4 Replace the SCU PCB
L39 BL OPEN FAIL
PCU The BL inlet opened for a short
time
Bad connection
4 Check the wiring
External cause
4 Check the device connected to the BL contact
Parameter incorrectly set
4 Check the parameter IN.BL
D03
D04
OUTL S.B FAIL.
OUTL S.C FAIL.
SCU Circuit B flow sensor fault
Circuit C flow sensor fault
Remarks:
The circuit pump is running.
The 3-way valve motor on the
circuit is no longer powered and
can be adjusted manually.
Bad connection
4 Check whether the sensor is connected:
¼See chapter: "Deletion of sensors from
the memory in the PCB", page 79
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
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
4 Check whether the sensor is connected:
¼See chapter: "Deletion of sensors from
the memory in the PCB", page 79
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
D07
AUX.SENS.FAIL
SCU Auxiliary sensor fault Bad connection
4 Check whether the sensor is connected:
¼See chapter: "Deletion of sensors from
the memory in the PCB", page 79
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
7. Troubleshooting Diematic iSystem For C 330 / C 630 ECO
77
31082018 - 7600691-001-06
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