DE DIETRICH MODULENS AGC 15, AGC 25, AGC 35 - Manual (Page 35)

Code Faults Cause
of the
fault Description Checking / solution
L40 TEST.HRU.FAIL PCU HRU/URC unit test error Bad connection
External cause
Parameter incorrectly set
4
Contact the professional who takes care of
maintenance of the appliance
L250 DEF.WATER MIS. PCU The water pressure is too low Hydraulic circuit incorrectly vented
Water leak
Measurement error
4 Top up with more water if necessary
4 Reset the boiler
L251 MANOMETRE FAIL PCU Fault on the water pressure sensor Wiring problem
The manometer is defect
Sensor pcb defect
4
Contact the professional who takes care of
maintenance of the appliance
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
Sensor fault
4 Contact the professional who takes care of
maintenance of the appliance
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 AUX.SENS.FAIL SCU Auxiliary 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
Contact the professional who takes care of
maintenance of the appliance
Boiler module failure
4
Contact the professional who takes care of
maintenance of the appliance
AGC 10/15 AGC 15 AGC 25 AGC 35 6. Troubleshooting
03/12/2013 - 300026080-001-03 34