78
EN
Cod. 3541T090 - Rev. 00 - 06/2019
ALARMS
11.2 Boiler faults
LCD Off
Make sure that the card is powered: using a digital multimeter, check for the pre-
sence of supply voltage.
In case of no voltage, check the wiring.
If the voltage is sufficient ( Range 195 – 253 Vac ), check the fuse (3.15AL@230VAC).
The fuse is on the card. To reach it, see fig. 205 and fig. 167.
fig. 167 -
LCD On
In case of operating problems or trouble, the display flashes and the fault identification code appears
There are faults that cause permanent shutdowns (marked with the letter “A”): to restore operation it is sufficient to press the reset button (detail 6 - fig. 1) for 1 second
or use the RESET on the remote timer control (optional) if installed; if the boiler does not restart, it is necessary to, firstly, eliminate the fault.
Other faults cause temporary shutdowns (marked with the letter “F”) which are automatically reset as soon as the value returns within the boiler’s normal working
range.
Table. 9 - Boiler list of faults
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 positio-
ned and free of any deposits; replace the electrode if necessary.
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
Air/fume ducts obstructed Remove the obstruction from the flue, fume extraction ducts, air
inlet and terminals.
A02 Flame present signal
with burner off
Electrode fault Check the ionization electrode wiring
Check the condition of the electrode
Electrode to earth
Cable to earth
Check the trap and clean it if necessary
Card fault Check the card
A05 Fan fault No 230V power supply Check the 5-pin connector wiring
Tachometric signal interrupted
Fan damaged Check the fan
A06 No flame after the
ignition phase
Ionization electrode fault Check the position of the ionization electrode and replace it if
necessary
Flame unstable Check the burner
air/fume ducts obstructed Remove the obstruction from the flue, fume extraction ducts, air
inlet and terminals
Trap blocked Check the trap and clean it if necessary
F07 - F14
F15 - A07
High fume tempera-
ture
The fume probe detects an excessive tempera-
ture
Check the exchanger
Check the flue gas probe
Check the flue material parameter
F08
A08
Overtemperature pro-
tection intervention
Heating sensor damaged Check the correct positioning and operation of the heating sen-
sor and replace it if necessary
No water circulation in the system Check the circulating pump
Air in the system Vent the system
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