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7
Correcting Faults
Fault
No ignition flame forms.
The flame monitor switches to fault
condition during operation.
Causes
No ignition sparks occur.
Possible cause
- No supply voltage on the
ignition burner.
- Ignition electrode is
burnt down.
- Distance between ignition
electrode and ground is
not correct or there is an
accidental ground pres
ent.
- Ignition electrode is
contaminated.
- An insulator is broken.
- Ignition transformer is
defective.
Ignition flame has been extinguished.
Possible cause
- Pressure in combustion
chamber fluctuating.
- Gas and air pressures
fluctuating.
- Main flame is influenced
by flows in the combus
tion chamber or due to
external deflection.
- No combustion air in the
combustion chamber.
59
Fault rectification
Check supply voltage.
Ensure that the ignition burner is being cor-
rectly activated by the system control.
Replace ignition electrode.
Check the distance between ignition electrode
and ground and correct, if necessary.
Rectify contamination using steel wool or sand-
paper until the electrode is bare.
Replace insulator with spacer and centre
holder.
Replace ignition transformer.
Provide for differential pressure control on the
gas and air side.
Correct the installation position and power of
the ignition burner.
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