4.4 Troubleshooting
Diagnostics
In case of operation faults or problems, the display flashes and the fault identification
code appears.
There are faults that cause permanent shutdown (marked with the letter “A”): to restore
operation just press the reset button (detail 6 -fig. 1) for 1 second or RESET on the op-
tional remote timer control if installed; if the boiler fails to start, it is necessary to firstly
eliminate the fault.
Faults marked with the letter “F” cause temporary shutdowns that are automatically reset
as soon as the value returns within the boiler's normal working range.
Table of faults
Table. 10 - List of faults
5. TECHNICAL DATA AND CHARACTERISTICS
Table. 11 - Key of figures cap. 5
5.1 General view and main components
fig. 26 - Front view
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
Insufficient gas supply pressure Check the gas supply pressure
Trap blocked Check the trap and clean it if
necessary
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
A04
Fume extraction duct safety
device activation
Fault F07 generated 3 times in the
last 24 hours
See fault F07
A05
Fan protection activated Fault F15 generated for 1 hour (con-
secutive) See fault F15
A06
No flame after ignition stage
(6 times in 4 minutes)
Ionisation electrode fault Check the position of the ionisation
electrode and replace it if necessary
Flame unstable Check the burner
Gas valve Offset fault Check the Offset adjustment at mini-
mum power
air/fume ducts obstructed
Remove the obstruction from the flue,
fume extraction ducts and air inlet and
terminals
Trap blocked Check the trap and clean it if
necessary
F07
High fume temperature The fume probe detects an
excessive temperature Check the exchanger
F10
Delivery sensor 1 fault
Sensor damaged
Check the wiring or replace the sensorWiring shorted
Wiring disconnected
F11
Return sensor fault
Sensor damaged
Check the wiring or replace the sensorWiring shorted
Wiring disconnected
F12
DHW sensor fault
Sensor damaged
Check the wiring or replace the sensorWiring shorted
Wiring disconnected
F13
Fume probe fault
Probe damaged
Check the wiring or replace the fume
probe
Wiring shorted
Wiring disconnected
F14
Delivery sensor 2 fault
Sensor damaged
Check the wiring or replace the sensorWiring shorted
Wiring disconnected
F15
Fan fault
No 230V power supply Check the -pin connector wiring
Tachometric signal interrupted Check the -pin connector wiring
Fan damaged Check the fan
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
pressure
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 activating
the sliding temperature
Reconnect the external probe or
disable the sliding temperature
A42
Heating sensor fault Sensor damaged Replace the sensor
F43
Exchanger protection activa-
tion.
No system H
2
O circulation Check the circulating pump
Air in the system Vent the system
F52
Heating sensor fault Sensor damaged Replace the sensor
A61
Controller
ABM03'
fault Controller
ABM03'
internal error Check the earth connection and
replace the controller if necessary.
A62
No communication between
controller and gas valve
Controller not connected Connect the controller to the gas valve
Valve damaged Replace the valve
A63
F64
A65
F66
Controller
ABM03'
fault Controller
ABM03'
internal error Check the earth connection and
replace the controller if necessary.
A23
A24
F20
F21
A26
F40
F47
Card parameter fault Wrong card parameter setting Check the card parameter and modify
it if necessary.
7
Gas inlet
138
External probe (optional)
10
System delivery
139
Remote timer control (optional)
11
System return
145
Pressure gauge
14
System safety valve
154
Condensate drain pipe
16
Fan
155
Hot water tank temperature probe (optional)
32
Heating circulating pump
186
Return sensor
36
Automatic air vent
191
Fume temperature sensor
44
Gas valve
193
Trap
56
Expansion tank
241
Automatic bypass
72
Room thermostat (optional)
74
System filling cock
275
Heating system drain cock
81
Ionisation/ignition electrode
278
Double sensor (Safety + Heating)
95
Diverter valve (optional)
350
Fan/Burner assembly
114
Water pressure switch
A
ON/OFF switch (configurable)
Fault
code Fault Possible cause Cure
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400
114
186
32
145
350
81
36
191
275
44
16
278
193
56
54
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