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7 Correcting Faults
Fault Causes Fault rectification
The ignition flame forms but goes
out after the ignition safety time
expires.
Ionisation monitoring not functioning
Possible cause
- Ionisation electrode is
burnt down.
Replace ionisation electrode
- An insulator is broken. Replace insulator with spacer and centre
holder.
- Flame monitor is con
nected incorrectly or is
incorrectly activated.
Check electrical connection of the flame moni-
tor.
Ensure that the flame monitor is being correctly
activated by the system control.
- The distance between the
ionisation electrode and
ground is not correct or
there is an accidental
ground present.
Correct the distance between ionisation elec-
trode and ground by bending the ionisation
electrode or replace the ionisation electrode.
- The insulating property of
the insulators is impaired
due to overheating of the
ignition burner.
Ensure that the ignition burner is continually
flushed with combustion air to reduce the heat
effect.
- The ignition flame is not
located in the coverage
area of the ionisation
electrode.
Adjust the gas and air operating pressures cor-
rectly (see chapter 5.3 Commissioningsection
"Adjust the flame quality and flame stability".
- The ignition spark inter
feres with the ionisation
feedback.
Ensure that the system control
switches off the ignition spark before the igni-
tion safety time expires (-0.5 s).
- The operating voltage
and basic voltage are
simultaneously switched
on.
Ensure that the system control switches on the
operating voltage 5 s after the basic voltage.
Flame monitor is faulty. Have the manufacturer inspect the flame moni-
tor and replace, if necessary.
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