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6. 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.
L04
DEF.OUTLET S.
L05
STB OUTLET
L06
BACK S.FAILURE
35
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 Bad connection
PCU
The boiler flow sensor has short-
circuited
PCU
The boiler flow sensor is on an open
circuit
PCU
Boiler temp too low
PCU
Boiler temperature too high
PCU
The return temperature sensor has
short-circuited
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
PSU PCB faulty
Contact the professional who takes care of
4
maintenance of the appliance
PSU PCB faulty
Contact the professional who takes care of
4
maintenance of the appliance
Bad connection
Sensor fault
Contact the professional who takes care of
4
maintenance of the appliance
Bad connection
Sensor fault
Contact the professional who takes care of
4
maintenance of the appliance
Bad connection
Sensor fault
Contact the professional who takes care of
4
maintenance of the appliance
No water circulation
Vent the air in the heating system
4
Check the circulation (direction, pump,
4
valves)
Check the water pressure
4
Bad connection
Sensor fault
Contact the professional who takes care of
4
maintenance of the appliance
No water circulation
Vent the air in the heating system
4
Check the circulation (direction, pump,
4
valves)
Check the water pressure
4
Bad connection
Sensor fault
Contact the professional who takes care of
4
maintenance of the appliance
15/06/12 - 300022162-001-01
MCA 25/28 BIC
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