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Problems - Causes - Remedies signalled by LED indicators
No
Faults
20
UV: no flame at the end of the
nd
2
safety time (MTFI)
21
Safety relay fault
22
Supervisor processor fault
23
Supervisor memory test fault
24
Flame loss during the operation
(AUTO)
25
Supervisor
processor
memory fault
26
Supervisor processor internal
fault
27
Not used
28
Not used
29
Operating temperature out of
range
30
Code memory fault
31
FR: external short circuit
32
Check mode timeout (manual)
33
False flame in stand-by mode
34
Not used
35
Internal processor timeout
36
Internal processor timeout
37
Combustion air check timeout
38
Internal processor timeout
39
Internal processor timeout
40
Internal hardware fault
41
Internal hardware fault
42
Main processor fault
43
Supervisor processor fault
44
Supervisor processor timeout
45
Off-specification mains voltage
46
Off-specification mains voltage
47
UV: Internal fault
48
Supervisor processor fault
49
Main processor fault
50
Ignition feedback fault
51
Pilot feedback fault
52
Piloted valve feedback fault
53
Actuator feedback waiting time
expired
54
Direct ignition valve feedback
fault
55
Internal processor fault
Cause
No flame at the end of the 2
Internal fault
Internal fault
Internal fault
Loss of flame
data
Internal fault
Internal fault
Operating temperature below -40
°
above 70
C
Internal fault
External short circuit between T24 and
EARTH
The interval for the manual mode (30
minutes) to end has elapsed
Unexpected flame (false or parasitic flame)
detected during the Stand-by status
Internal fault
Internal fault
The system could not perform verification
tests of the combustion air during the burner
sequence
Internal fault
Internal fault
Internal fault
Internal fault
Internal fault
Internal fault
Internal fault
Off-specification mains voltage/frequency
Off-specification mains voltage/frequency
Internal fault
Internal fault
Internal fault
The system detected the presence of
voltage on T16 at the wrong moment or
there is no voltage when necessary
The system detected the presence of
voltage on T17 at the wrong moment or
there is no voltage when necessary
The system detected the presence of
voltage on T19 at the wrong moment or
there is no voltage when necessary
No actuator feedback on T8 for more than
10 minutes
The system detected the presence of
voltage on T18 at the wrong moment or
there is no voltage when necessary
Internal fault
43
Solution
Inspect the system, check the gas pressure,
nd
safety time
check the flame sensor, check the wiring,
etc.
Replace the control device
Replace the control device
Replace the control device
Check the flame sensor or the fuel flow line
Replace the control device
Replace the control device
Bring the control device within the specified
°
C or
temperature nominal values
Replace the control device
Inspect the flame detection electrode
Exit the manual mode correctly to avoid
timeout
Check flame sensor or interference
Replace the control device
Replace the control device
Check the wiring or the air pressure switch
Replace the control device
Replace the control device
Replace the control device
Replace the control device
Replace the control device
Replace the control device
Replace the control device
Check the mains voltage level or the
frequency. Contact the factory if the
problem persists
Check the mains voltage level or the
frequency.
Contact the factory if the problem persists
Replace the control device
Replace the control device
Replace the control device
Check the wiring and make sure that the
earthing is appropriate
If
the
distributor/factory
Check the wiring and make sure that the
earthing is appropriate. If the problem
persists, contact the distributor/factory
Check the wiring and make sure that the
earthing is appropriate
If
the
distributor/factory
Check the wiring
Check the modulation equipment
Check the wiring and make sure that the
earthing is appropriate. If the problem
persists, contact the distributor/factory
Replace the control device
GB
problem
persists,
contact
problem
persists,
contact
the
the
20152093
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