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