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LMV5000.EN202001V6
Flame failure
Flame failure is the most difficult burner system error to trace.
If the flame monitor does not locate a flame, depending on the start sequence phase,
a flame failure may be triggered.
A flame failure can occur because the gas flame does not ignite. The problem can be
the electric spark does not light the pil
ot flame or the pilot flame doesn’t ignite the
main flame.
The combustion may also be unstable causing the flame to go out during operation.
Because of the many potential causes it is very hard to determine why the flame
failure occurs. The start sequence phase when the failure occurs may provide
additional information. When applicable write down the error code indicated in the
Faults section of the Autoflame module.
Potential causes
No ignition spark:
•
Defect ignition transformer.
•
Defect or incorrectly adjusted ignition electrodes.
•
Loose ignition cables.
•
Spark not in the correct position (Refer to information on Earth/mass).
No pilot flame:
•
Defect gas solenoid (pos. MK).
•
No combustible gas mixture, does not ignite.
•
Pilot valve isn’t detected by flame monitoring unit or flame signal is too
low.
No main flame:
•
Defect safety valve(s) (pos. VA1 and VA2).
•
The air-gas ratio is not appropriate, because of which the air-gas mixture
does not ignite, or even goes out during operation.
•
Main flame is not detected by the flame monitoring unit because the flame
is too low.
Flame failure before gas valves have opened:
•
Defect UV scanner.
•
Inappropriate lighting, for example, through sight glass.
•
IMPORTANT:
After a failure the reset button has to be pressed to reset a failure.
Before reset, note the position or symbol in the screen of the burnercontrolbox.
Attention!!
It’s possible that maximum thermostat and lowwater float device are
mechanical locked. The reset button is on the safety device itself and should be reset
first. If the burner doesn’t start it’s possible that there’s a failure on the CO
2
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dosingunit and/or CO-detector.
Summary of Contents for RKB
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