87EN
cod. 3540000272 - Rev. 01 - 01/2024
A06
No flame after the ignition
phase
Ionization electrode fault Check the position of the ionization elec-
trode, free it from any deposits and do a
complete manual calibration, if necessary
replace the electrode.
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
Wrong calibration Do complete manual calibration.
F15 - A07
High fume temperature
The fume probe detects an
excessive temperature
Check the exchanger
Check the fume probe
Check the flue material parameter
A08
Overtemperature protec-
tion intervention
Sensor not correctly positio-
ned on flow pipe or dama-
ged
Check the correct positioning and operation
of the heating sensor and replace it if
necessary
No water circulation in the
system
Check the circulating pump
Air in the system Vent the system
A09
Exchanger protection inter-
vention
No water circulation in the
system
Check the circulating pump and heating
system
Poor circulation and anoma-
lous flow probe temperature
increase
Vent the system
blocked exchanger check the exchanger and system
F09
Overtemperature protec-
tion intervention
Flow sensor damaged
Check correct positioning and operation of
the flow sensor and replace it if necessary
No water circulation in the
system
Check the circulating pump and heating
system
Air in the system Vent the system
F10
Flow sensor 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 probeWiring shorted
Wiring disconnected
A14
Fume extraction duct safety
device intervention
Fault A07 generated 3 times
in the last 24 hours
See fault A07
F34
Supply voltage under 180V Electric mains trouble Check the electrical system
F35
Wrong supply frequency Electric mains trouble Check the electrical system
A23
System filling, with par.
b07
= 2
, over 5 minutes.
Loss in system Check the system or the filling valve
A24
3 remote filling attempts in
24 hours
Loss in system Check the system
A26-F20 -F21
F40-F47-F51
Water pressure switch fault
Wrongly configured parame-
ter
Check if parameter
b04
is configured
correctly (default 0=pressure switch)
System pressure problems
(transducer)
System pressure value outside set limits
(transducer)
b06
set to 3
F37
Incorrect system water
pressure
Pressure too low Fill the system
Water pressure switch
damaged or disconnected
Check the water pressure switch
Fault code Fault Possible cause Cure
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