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
24
20
p
b
AUTO
x c
r
j
M
g
m
SUNDAY 11:45
TEMP. : 68°
PCU COM.FAIL D27
C002302-D-04
7. Troubleshooting
AGC 10/15 AGC 15 AGC 25 AGC 35
33
15/03/2016 - 300026080-001-07
