FL D LN C
23
EN
cod. 3541P831 - Rev. 00 - 02/2021
Periodical inspection
To ensure proper operation of the unit over time, have qualified personnel carry out a
yearly inspection, providing for the following checks:
•
The control and safety devices (gas valve, flow switch, thermostats, etc.) must func-
tion correctly.
•
The fume exhaust circuit must be perfectly efficient.
(Sealed chamber boiler: fan, pressure switch, etc. - The sealed chamber must be
tight: seals, cable glands, etc.)
(Open chamber boiler: anti-backflow device, fume thermostat, etc.)
•
The air/fume terminal and ducts must be free of obstructions and leaks
•
The burner and exchanger must be clean and free of deposits. Do not use chemical
products or wire brushes to clean.
•
The electrode must be properly positioned and free of deposits.
fig. 14 - Electrode positioning
•
The gas and water systems must be tight.
•
The pressure of the water in the system when cold must be approx. 1 bar; otherwise,
bring it to that value.
•
The circulating pump must not be blocked.
•
The expansion tank must be filled.
•
The gas flow and pressure must match that given in the respective tables.
4.4 Troubleshooting
Diagnostics
The boiler has an advanced self-diagnosis system. In case of a boiler fault, the display
will flash together with the fault symbol (detail 11 - fig. 1) indicating the fault code.
There are faults that cause permanent shutdowns (marked with the letter "
A
"): to restore
operation, press the RESET button (detail 6 - fig. 1) for 1 second or RESET on the op-
tional remote timer control if installed. At this point the display will show
“d4”
for about
30 seconds
or
“d5”
for about
5 minutes
which indicates the waiting time after which the
boiler will resume normal operation. if the boiler fails to restart, it is necessary to eliminate
the fault.
Other faults cause temporary shutdowns (marked with the letter “
F
”) which are automat-
ically reset as soon as the value returns within the boiler's normal working range.
List of faults
Table. 2
5. TECHNICAL DATA AND CHARACTERISTICS
Table. 3- Legend, fig. 20, fig. 21 and fig. 22
Fault
code
Fault
Possible cause
Cure
A01
No burner ignition
No gas
Check the regular gas flow to the boiler
and that the air has been eliminated
from the pipes
Ignition/detection electrode fault
Check the wiring of the electrode and
that it is correctly positioned and free
of any deposits
Faulty gas valve
Check the gas valve and replace it if
necessary
Gas valve wiring disconnected
Check the wiring
Ignition power too low
Adjust the ignition power
A02
Flame present signal with
burner off
Electrode fault
Check the ionisation electrode wiring
Card fault
Check the card
A03
Overtemperature protection
activation
Heating sensor damaged
Check the correct positioning and
operation of the heating sensor
No water circulation in the system Check the circulating pump
Air in the system
Vent the system
F04
Fume thermostat activated
(after activation of the fume
thermostat, boiler operation
is prevented for 20 minutes)
Fume thermostat contact open
Check the thermostat
Wiring disconnected
Check the wiring
Flue obstructed or not correctly
sized
Check the flue
F05
Card parameter fault
Wrong card parameter setting
Check the card parameter and modify
it if necessary
A06
No flame after the ignition
phase
Low pressure in the gas system
Check the gas pressure
Burner minimum pressure setting Check the pressures
F07
Card parameter fault
Wrong card parameter setting
Check the card parameter and modify
it if necessary
A09
Gas valve fault
Wiring disconnected
Check the wiring
Faulty gas valve
Check the gas valve and replace it if
necessary
3
±
0,5
97
31
F10
Delivery sensor 1 fault
Sensor damaged
Check the wiring or replace the sensor
Wiring shorted
Wiring disconnected
F11
DHW sensor fault
Sensor damaged
Check the wiring or replace the sensor
Wiring shorted
Wiring disconnected
F14
Delivery sensor 2 fault
Sensor damaged
Check the wiring or replace the sensor
Wiring shorted
Wiring disconnected
A16
Gas valve fault
Wiring disconnected
Check the wiring
Faulty gas valve
Check the gas valve and replace it if
necessary
F20
Card parameter fault
Wrong card parameter setting
Check the card parameter and modify
it if necessary
A21
Card parameter fault
Wrong card parameter setting
Check the card parameter and modify
it if necessary
A23
Card parameter fault
Wrong card parameter setting
Check the card parameter and modify
it if necessary
A24
Card parameter fault
Wrong card parameter setting
Check the card parameter and modify
it if necessary
F34
Supply voltage under 170V. Electric mains trouble
Check the electrical system
F35
Faulty mains frequency
Electric mains trouble
Check the electrical system
F37
Incorrect system water pres-
sure
Pressure too low
Fill the system
Water pressure switch damaged or
not connected
Check the sensor
F39
External probe fault
Probe damaged or wiring shorted Check the wiring or replace the sensor
Probe disconnected after activat-
ing the sliding temperature
Reconnect the external sensor or disa-
ble the sliding temperature
A41
Sensor positioning
Delivery sensor or DHW sensor
detached from the pipe
Check the correct positioning and
operation of the sensors
Not increase the flow tem-
perature
Failed complete burner ignition
Increase parameter
P1
up to a maxi-
mum of
19
F42
Heating sensor fault
Sensor damaged
Replace the sensor
F43
Exchanger protection trips.
No system H
2
O circulation
Check the circulating pump
Air in the system
Vent the system
F50
Gas valve fault
Modulating Operator wiring discon-
nected
Check the wiring
Faulty gas valve
Check the gas valve and replace it if
necessary
A51
Card parameter fault
Wrong card parameter setting
Check the card parameter and modify
it if necessary
8
DHW outlet - Ø 1/2”
56
Expansion vessel
9
DHW inlet - Ø 1/2”
74
System filling faucet
10
System delivery - Ø 3/4”
78
Anti-backflow device
11
System return - Ø 3/4”
81
Ignition and detection electrode
14
Safety valve
95
Diverter valve
22
Burner
114
Water pressure switch
27
Copper exchanger for heating and DHW
126
Fume thermostat
32
Heating circulating pump
136
Flowmeter
36
Automatic air vent
137
Pressure sensor
37
Cold water inlet filter
194
DHW exchanger
42
DHW temperature sensor
241
Automatic bypass
44
Gas valve
278
Double sensor ( heating)
Fault
code
Fault
Possible cause
Cure
