Riello RS 64/M MZ Installation, Use And Maintenance Instructions page 41

Problems - Causes - Remedies signalled by LED indicators
Fault explanation
No. Faults
1 Post-diagnostics fault
2 Local reset
3 Combustion air fan fault
4 Supervisor processor
diagnostics fault
5 FR- No flame at the end of the
nd
2 safety time (MTFI)
6 FR: internal circuit fault
7 Internal communication fault
8 Remote reset
9 FR: internal fault
10 Main processor fault
11 Data memory test fault
12 Data memory test fault
13 Mains voltage or frequent fault
14 Internal processor fault
15 Internal processor fault
16
st
No flame: 1 safety time (PTFI)
17 Wiring fault
18 Safety relay fault
19 Combustion airflow switch fault
in the rest position
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 data
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
Cause
Initial power diagnostics fault
Make sure that the status of inlets and
outlets is correct upon ignition
The user started the manual reset or the
reset switch is faulty
No Air Check signal (T14) during the bleed
cycle or Air Check signal loss during the
burner operation
The system detected the presence of
voltage on T16, T17, T18 or T19 at the
wrong moment or there is no voltage when
necessary
No flame at the end of the second safety
time
Internal fault
Internal fault
The user pressed the remote reset button or
the reset switch is discontinuous/dynamic
Internal fault
Internal fault
Internal fault
Internal fault
Off-specification power supply voltage and/
or frequency
Internal fault
Internal fault
No flame at the end of the first safety time
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
Internal fault
Open the circuit upon T13 start-up
No flame at the end of the 2
Internal fault
Internal fault
Internal fault
Loss of flame
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
39 GB
Solution
Check T12, T13 and T14
Check T21 inlet or reset for normal
operation
Check the fan or the air pressure switch
Check the wiring and make sure that the
system is operating on a single-phase line
(50/60Hz)
Inspect the system, check the gas pressure,
inspect the flame detection electrode, check
the wiring, etc.
Replace the control device
Replace the control device
Check the remote switch
Replace the control device
Replace the control device
Replace the control device
Replace the control device
Check the input power supply
Replace the control device
Replace the control device
Inspect the system, check the gas pressure,
check the flame sensor, check the wiring,
etc.
Inspect the wiring and make sure that the
system is operating on a single-phase line
(50/60Hz)
Replace the control device
Check the wiring for the air pressure switch
Inspect the system, check the gas pressure,
nd
check the flame sensor, check the wiring,
safety time
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
°
C or Bring the control device within the specified
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
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