Faults / Solutions - Riello MO550-BWG Installation, Use And Maintenance Instructions

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Faults / Solutions

Here below you can find some causes and the possible solutions
for some problems that could cause a failure to start or incorrect
operation of the burner.
A fault usually makes the lockout LED signal which is situated in-
side the reset button of the control box.
Faults
The burner does not Lack of electrical supply.
start when there is heat
request.
the flame sensor sees an extrane-
ous light.
The connections in the control box
are wrongly inserted.
No bridge socket P.
The burner goes into The flame sensor sees an extrane-
lockout mode before or ous light.
during the pre-purging.
Burner runs normally in The flame sensor is dirty.
the pre-purging and igni-
The flame sensor is faulty.
tion cycle and locks out
Flame moves away or fails.
after about 5 seconds.
Yellow flame. Nozzle dirty or worn.
Defect in the air output.
Pump pressure is not correctly set.
Air suction inlet is clogged.
Obstruction in the exhaust circuit.
Burner starts with an The ignition electrodes are wrongly
ignition delay. positioned.
Air flow rate is too high.
Nozzle dirty or worn.
The manufacturer cannot accept responsibility for
any damage to persons, animals or property due
to error in installation or in the burner adjustment,
or due to improper or unreasonable use or non
WARNING
observance of the technical instruction enclosed
with the burner, or due to the intervention of un-
qualified personnel.
Faults / Solutions
Probable cause
19
When lockout lamp comes on the burner will attempt to light only
after pushing the reset button. After this if the burner functions
correctly, the lockout can be attributed to a temporary fault that is
not dangerous.
Otherwise, if the lockout persists the cause of the fault should be
sought and the solutions shown in Tab. J put into effect.
Fault
diagnostics
OFF Check presence of voltage in the L - N the pin plug.
Check the conditions of the fuses.
Check that safety thermostat is not in lockout.
Eliminate the extraneous light.
OFF Check and connect all the plugs and sockets prop-
erly.
Insert it.
0.5 sec ON
2.5 sec OFF
Eliminate the extraneous light.
RED Clear it.
Steady ON
Replace it.
Check pressure and output of the fuel.
Check air flow rate.
Change nozzle.
Check the coil of solenoid valve.
Replace it.
Adjust the air flow rate.
Verify the pressure and the output of the fuel and
- adjust them according to the instructions of this
manual.
Clean it.
Clean it.
OFF Adjust them according to the instructions of this
manual.
Set the air output according to the instructions of
this manual.
Replace it.
GB
Solutions
Tab. J
20138365