Type No. Fault Solution
ALL 07
Sensor or safety
thermostat inter-
venes
- Check the sensor or ther-
mostat connections
- Deaerate the system
- Check the bleed valve
- Replace the sensor or the
thermostat
- Check that the pump impel-
ler is not blocked
ALL 08
Fault in the flame
detection circuit
- Check the integrity of the
electrode and check that it
is not grounded
- Check gas availability and
pressure
- Check the integrity of the
gas valve and the card
ALL 09
No water circulat-
ing in the system
- Check the rotation of the
system pump impeller
- Check the electrical con-
nections
- Replace the pump
ALL 11
Gas valve modula-
tor disconnected
- Check the electrical con-
nection
ALL 12
Incorrect configu-
ration of the open /
sealed chamber
- Set the parameter tS 0.4
(Combustion configuration)
to 0
ALL 17
Fault regarding
maximum deviation
between the 2 NTC
heating sensors
- Replace the dual sensor
ALL 28
Maximum number
of consecutive
releases reached
- Contact the Technical Assis-
tance Centre
ALL 37
Fault due to low
network voltage.
- Check with tester
- Contact network provider
(ENEL)
ALL 40
Incorrect network
frequency detected
- Contact network provider
(ENEL)
ALL 41
Flame loss more
than 6 consecutive
times
- Check the detection elec-
trode
- Check the gas supply (open
valve)
- Check mains gas pressure
ALL 42 Button fault
- Check that buttons are
working
ALL 74
Fault in the 2nd
element of the
delivery sensor
- Replace the sensor
ALL 81
Block due to
combustion during
start-up
- Check for blockage in
chimney
- Bleed the air from the gas
circuit
ALL 83
Irregular combus-
tion (temporary
error)
- Check for blockage in
chimney
ALL 96
Block due to
clogging in smoke
outlet
- Check for blockage in
chimney
- -
Frequent relief
valve intervention
- Check circuit pressure
- Check expansion vessel
- -
Limited production
of domestic hot
water
- Check the diverter valve
- Check that plate heat ex-
changer is clean
- Check domestic hot water
circuit valve
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