Problems - Causes - Remedies signalled by LED indicators
37
20154169
GB
Fault explanation
No
Faults
Cause
Solution
1
Post-diagnostics fault
Initial power diagnostics fault
Make sure that the status of inlets and outlets
is correct upon ignition
Check T12, T13 and T14
2
Local reset
The user started the manual reset or the reset
switch is faulty
Check T21 inlet or reset for normal operation
3
Combustion air fan fault
No Air Check signal (T14) during the bleed
cycle or Air Check signal loss during the
burner operation
Check the fan or the air pressure switch
4
Supervisor processor
diagnostics fault
The system detected the presence of voltage
on T16, T17, T18 or T19 at the wrong
moment or there is no voltage when
necessary
Check the wiring and make sure that the
system is operating on a single-phase line
(50/60Hz)
5
FR- No flame at the end of the
2
nd
safety time (MTFI)
No flame at the end of the second safety time
Inspect the system, check the gas pressure,
inspect the flame detection electrode, check
the wiring, etc.
6
FR: internal circuit fault
Internal fault
Replace the control device
7
Internal communication fault
Internal fault
Replace the control device
8
Remote reset
The user pressed the remote reset button or
the reset switch is discontinuous/dynamic
Check the remote switch
9
FR: internal fault
Internal fault
Replace the control device
10
Main processor fault
Internal fault
Replace the control device
11
Data memory test fault
Internal fault
Replace the control device
12
Data memory test fault
Internal fault
Replace the control device
13
Mains voltage or frequent fault
Off-specification power supply voltage and/or
frequency
Check the input power supply
14
Internal processor fault
Internal fault
Replace the control device
15
Internal processor fault
Internal fault
Replace the control device
o. 16 No flame: 1
st
safety time (PTFI)
No flame at the end of the first safety time
Inspect the system, check the gas pressure,
check the flame sensor, check the wiring, etc.
17
Wiring fault
The system detected the presence of voltage
on critical terminals (T16, T17, T18 or T19) at
the wrong moment or there is no voltage
when necessary
Inspect the wiring and make sure that the
system is operating on a single-phase line
(50/60Hz)
18
Safety relay fault
Internal fault
Replace the control device
19
Combustion airflow switch fault
in the rest position
Open the circuit upon T13 start-up
Check the wiring for the air pressure switch
20
UV: no flame at the end of the
2
nd
safety time (MTFI)
No flame at the end of the 2
nd
safety time
Inspect the system, check the gas pressure,
check the flame sensor, check the wiring, etc.
21
Safety relay fault
Internal fault
Replace the control device
22
Supervisor processor fault
Internal fault
Replace the control device
23
Supervisor memory test fault
Internal fault
Replace the control device
24
Flame loss during the operation
(AUTO)
Loss of flame
Check the flame sensor or the fuel flow line
25
Supervisor processor data
memory fault
Internal fault
Replace the control device
26
Supervisor processor internal
fault
Internal fault
Replace the control device
27
Not used
28
Not used
29
Operating temperature out of
range
Operating temperature below -40
°
C or above
70
°
C
Bring the control device within the specified
temperature nominal values
30
Code memory fault
Internal fault
Replace the control device
31
FR: external short circuit
External short circuit between T24 and
EARTH
Inspect the flame detection electrode
32
Check mode timeout (manual)
The interval for the manual mode (30
minutes) to end has elapsed
Exit the manual mode correctly to avoid
timeout
Summary of Contents for RS 28/M
Page 2: ...Original instructions...
Page 47: ......