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3. Press the ? key. Follow the instructions displayed to solve the
problem.
4. Consult the meaning of the codes in the table below:
Code Faults Cause
of the
fault
Description Checking / solution
L00 PSU FAIL
PCU PSU PCB not connected Bad connection
PSU PCB faulty
4 Contact the professional who takes care of
maintenance of the appliance
L01 PSU PARAM FAIL
PCU The safety parameters are incorrect Bad connection
PSU PCB faulty
4 Contact the professional who takes care of
maintenance of the appliance
L02 DEF.OUTLET S.
PCU The boiler flow sensor has short-
circuited
Bad connection
Sensor fault
4 Contact the professional who takes care of
maintenance of the appliance
L03 DEF.OUTLET S.
PCU The boiler flow sensor is on an open
circuit
Bad connection
Sensor fault
4 Contact the professional who takes care of
maintenance of the appliance
L04 DEF.OUTLET S.
PCU Boiler temp too low Bad connection
Sensor fault
4 Contact the professional who takes care of
maintenance of the appliance
No water circulation
4 Vent the air in the heating system
4 Check the circulation (direction, pump,
valves)
4 Check the water pressure
L05 STB OUTLET
PCU Boiler temperature too high Bad connection
Sensor fault
4 Contact the professional who takes care of
maintenance of the appliance
No water circulation
4 Vent the air in the heating system
4 Check the circulation (direction, pump,
valves)
4 Check the water pressure
L06 BACK S.FAILURE
PCU The return temperature sensor has
short-circuited
Bad connection
Sensor fault
4 Contact the professional who takes care of
maintenance of the appliance
bar
1
1
2
2
r
c
STD
(
'
t
v
0 2 4 6 8 10 12 14 16 18 22 2420
p
b
AUTO
x
c
r
j
M
g
m
SUNDAY 11:45
TEMP. : 68°
PCU COM.FAIL D27
C002302-D-04
6. Troubleshooting MCA 15 - MCA 25 MCA 25/28 MI
35
15/06/12 - 300022161-001-01
36


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