45
Type No. Fault Solution
AL 10 Auxiliary sensor fault
- Check the hydraulic con-
figuration using "tS 0.2"
- Check the electrical con-
nection
AL 11
Gas valve modulator
disconnected
- Check the electrical con-
nection
AL 12
Domestic hot water
sensor fault in tank
mode
- Set the parameter tS 0.4
(Combustion configuration)
to 0
AL 13
Exhaust sensor (SF)
intervention
- Check the sensor is
working
- Replace the smoke probe
AL 14
Exhaust sensor (SF)
fault
- Replace the smoke probe
- Check the electrical con-
nection of the smoke probe
- Contact the Technical
Assistance Centre
AL 15
Fan check cable dis-
connected
- Check the connection
cable between the fan and
the board
AL 18 Condensate level fault
- Check for any clogging in
the pipe which takes the
condensate to the siphon
- Check that the siphon is
not clogged
AL 28
Maximum number of
consecutive resets
reached (6)
- Wait 1 hour and try un-
blocking the board again
- Contact the Technical
Assistance Centre
AL 30
Return sensor fault
(boiler sensor fault for
T models)
- Replace the return probe
- Check parameters
- Contact the Technical
Assistance Centre
AL 37
Fault due to low net-
work voltage
- Check the voltage
- Contact your network
provider
AL 40
Incorrect supply fre-
quency detected
- Contact your network
provider
AL 41
Flame loss more than
6 consecutive times
- Check the ignition/detec-
tion electrode
- Check the gas supply
(open valve)
- Check mains gas pressure
AL 42 Button fault
- Check that buttons are
working
AL 43
Open Therm communi-
cation fault
- Check the OT electric
connection
AL 44
No flame valve opening
time sum anomaly
- Check for the presence
of water hammer on the
hot water system and, if
present, mount a water
hammer arrestor
- Check for any abnormal
requests on the room
thermostat
- Contact the Technical
Assistance Centre
AL 56
Lock for ∆T delivery/
return over max limit
(open vent)
- Contact the Technical
Assistance Centre
AL 57
Lock for flow temper-
ature (FT) check (open
vent)
- Contact the Technical
Assistance Centre
AL 62
Self-calibrating proce-
dure is required
- Carry out the self-cali-
brating procedure (see the
specific section)
AL 72
Incorrect positioning of
the delivery sensor
- Check delivery sensor
operation and position
AL 74
Second delivery sensor
fault
- Check second delivery
sensor operation and
position
AL 77
EV2 SGV current max/
min absolute limits
error
- Check gas valve and board
AL 78
EV2 SGV current upper
limit error
- Check gas valve and board
AL 79
EV2 SGV current lower
limit error
- Check gas valve and board
Type No. Fault Solution
AL 80
Fault on the valve
control logic line/valve
cable damaged
- Check gas valve and board
AL 81
Lockout due combus-
tion during start-up
- Check for blockage in flue
- Check air diaphragm (for
BF models)
- Check gas calibration
- Bleed the air from the gas
circuit
AL 82
Block due to numerous
combustion control
failures
- Check electrode
- Check outlets
- Check air diaphragm (for
BF models)
- Check gas calibration
AL 83
Irregular combustion
(temporary error)
- Check for blockage in flue
- Check air diaphragm (for
BF models)
- Check gas calibration
AL 84
Flow rate reduced for
(presumed) low pres-
sure on mains gas
- Check gas flow rate
AL 88
Internal error (board
component protection)
- Check the board is working
- Replace board
AL 89
Unstable combustion
feedback signal error
- Check electrode
- Check outlets
- Check air diaphragm (for
BF models)
- Check gas calibration
AL 90
Combustion set cannot
be reached error
- Check electrode
- Check outlets
- Check air diaphragm (for
BF models)
- Check gas calibration
ALL 91 Gas valve out of range - Recalibrate the gas valve
AL 92
System has reached
maximum air cor-
rection error (at the
minimum flow rate)
- Check electrode
- Check outlets
- Check air diaphragm (for
BF models)
- Check gas calibration
AL 93
Combustion set cannot
be reached error
- Check electrode
- Check outlets
- Check air diaphragm (for
BF models)
- Check gas calibration
AL 95
Flame signal micro
interruptions error
- Check electrode
- Check board
- Check electric power
supply
- Check gas calibration
AL 96
Lockout due to flue
(exhaust) blockage
- Check for blockage in flue
- Check the smoke outlet
and electrode position (not
touching the burner)
AL 98
SW error, board start-
up
- Contact the Technical
Assistance Centre
AL 99 General board error
- Contact the Technical
Assistance Centre
- -
Frequent relief valve
intervention
- Check circuit pressure
- Check expansion vessel
- -
Limited production of
domestic hot water
- Check the diverter valve
- Check that plate heat
exchanger is clean
- Check domestic hot water
circuit valve
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