Minimiser - Installation
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FAULT FINDING TABLE 4 - Flame Detection
Check detection electrode visually for
damage / contamination.
If possible, check insulation resistance, which
should be at least 100 Megaohms.
Check lead for electrical continuity.
Check that the electrode is in the flame area and
is 10mm (± 1mm) from the burner
Boiler lights briefly then goes off, leaving LED2
on the PCB lit
Remove the fan. Is the detection lead
undamaged and attached to the electrode ?
Exit
Check all connections on Board 37.
If no fault found, check Board 37 by substitution.
Boiler should now light
Is polarity of the supply correct ? Ensure that
live is connected to L and neutral to N
YES
YES
Remove burner assembly.
Is there a significant amount of water in the
combustion chamber (covering part of the
detection electrode) ?
NO
Re-assemble boiler.
Does the boiler now light ?
YES
Check condensate discharge system for
blockage, air locking or freezing
Condensate pipe run must be in minimum
22mm plastic pipe, run steadily downhill and
indoors, where possible
Outdoor runs should be avoided or minimised
YES
NO
FAULT FINDING
FAULT FINDING
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