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8. Troubleshooting
0
2
4
6
8
10
12
E
1
TEMP. : 68°
2
1
D
2
PCU COM.FAIL D27
bar
#
F
!
% $
AUTO
J
I
STD
Code Faults
L00
PSU FAIL
L01
PSU PARAM FAIL
L02
DEF.OUTLET S.
L03
DEF.OUTLET S.
108
14
16
18
20
22
24
SUNDAY 11:45
:
<
C002302-D-04
Cause
Description
of the
fault
PCU
PSU PCB not connected
PCU
The safety parameters are
incorrect
PCU
The boiler flow sensor has
short-circuited
PCU
The boiler flow sensor is on an
open circuit
3. Press the ? key. Follow the instructions displayed to solve the
problem.
4. Consult the meaning of the codes in the table below:
Checking / solution
Bad connection
4
PSU PCB faulty
4
Bad connection
4
PSU PCB faulty
4
Bad connection
4
4
4
Sensor fault
4
4
Bad connection
4
4
4
Sensor fault
4
4
Check the wiring between the PCU and PSU PCBs
Replace the PSU PCB
Check the wiring between the PCU and PSU PCBs
Replace the PSU PCB
Check the wiring between the PCU PCB and the
sensor
Check that the SU PCB is correctly in place
Check that the sensor has been correctly fitted
Check the Ohmic value of the sensor
Replace the sensor if necessary
Check the wiring between the PCU PCB and the
sensor
Check that the SU PCB is correctly in place
Check that the sensor has been correctly fitted
Check the Ohmic value of the sensor
Replace the sensor if necessary
15/06/12 - 300022160-001-01
MCA 35
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