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MCA 15 - MCA 25 MCA 25/28 MI
8.3
Faults (Code type Lxx or Dxx)
0
2
4
6
8
E
1
TEMP. : 68°
2
1
D
2
PCU. KOM. DEF D27
bar
#
F
% $
AUTO
J
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
Faults
Code Cause
PSU FAIL
L00
PSU PARAM FAIL
L01
DEF.OUTLET S.
L02
29/04/2010 - 300022146-001-B
10
12
14
16
18
20
22
24
SUNDAY 11:45
!
:
<
STD
C002604-A-04
14
16
18
20
22
24
SUNDAY 11:45
:
<
C002302-D-04
Description
of the
error
PCU
PSU PCB not connected
PCU
The safety parameters are
incorrect
PCU
The boiler flow sensor has
short-circuited
In the event of operational failure, the control panel flashes and
displays an error message and a corresponding code.
1. Make a note of the code displayed.
The code is important for the correct and rapid diagnosis of the
type of failure and for any technical assistance that may be
needed.
2. Press the t key. If the code is displayed again, switch off the boiler
and then switch it back on.
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
Check the wiring between the PCU and PSU PCBs
4
PSU PCB faulty
Replace the PSU PCB
4
Bad connection
Check the wiring between the PCU and PSU PCBs
4
PSU PCB faulty
Replace the PSU PCB
4
Bad connection
Check the wiring between the PCU PCB and the
4
sensor
Check that the SU PCB is correctly in place
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
115
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