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MCA 35
Code Faults
L39
BL OPEN FAIL
L40
TEST.HRU.FAIL
L250 DEF.WATER MIS.
L251 MANOMETRE FAIL PCU
D03
OUTL S.B FAIL.
D04
OUTL S.C FAIL.
D05
OUTSI.S.FAIL.
15/06/12 - 300022160-001-01
Cause
Description
of the
fault
PCU
The BL inlet opened for a short
time
PCU
HRU/URC unit test error
PCU
The water pressure is too low
Pressure gauge fault
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.
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.
Checking / solution
Bad connection
Check the wiring
4
External cause
Check the device connected to the BL contact
4
Parameter incorrectly set
Check the parameter IN.BL
4
Bad connection
Check the wiring
4
Parameter incorrectly set
Set the type of generator again in the menu
4
#CONFIGURATION (Refer to the original rating
plate)
Hydraulic circuit incorrectly vented
Water leak
Measurement error
Top up with more water if necessary
4
Reset the boiler
4
Wiring problem
The manometer is defective
Sensor pcb defective
Check the wiring between the PCU PCB and the
4
pressure gauge
Check whether the pressure gauge has been
4
correctly fitted
Replace the pressure gauge if need be
4
Bad connection
Check whether the sensor is connected:
4
See chapter: "Deletion of sensors from the
memory in the PCB", page 116
Check the link and the connectors
4
Check that the sensor has been correctly fitted
4
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
See chapter: "Deletion of sensors from the
memory in the PCB", page 116
Check the link and the connectors
4
Check that the sensor has been correctly fitted
4
Sensor fault
Check the Ohmic value of the sensor
4
Replace the sensor if necessary
4
8. Troubleshooting
¼
¼
113
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