page no. 62 of 68
LX Range Users, Installation & Servicing Instructions Doc Ref M110 issue 1.0 Dec 2020.
YES
YES
YES
Is a
spark present and
the Ignition Electrode and
flame present during the 5
second period?
NO
• Ensure spark gap is 2.5mm
• Ensure there are no cracks on
the ceramic
• Clean electrode with wire wool
• Ensure heater has a good earth
• Check cable to Pactrol
NO
Replace
Electrode!
YES
YES
Is the
flame sensor
sending a rectification
signal back to the
controller?
• Ensure there are no cracks on
the ceramic
• Clean electrode with wire wool
• Ensure mains polarity is
correct
• Check cable to Pactrol
Has the
flame rectified
NOW?
• Check flame current by
connecting a sensitive
multi-meter capable of
measuring micro amps
• Minimum reading is 1.0μA a
normal value should
be 1.5μA or higher.
NO
YES
Is
there
NOW a
spark present
at the ignition
Electrode?
Has the
flame rectified
NOW?
NO
Replace
Pactrol!
Replace
Pactrol!
NO
Is
there
NOW a
spark present
at the ignition
Electrode?
Continued from
previous page
YES
YES
Burner Fired!
Has the main fan
started after the delay?
NO
Is there 230V at
terminal strip t23?
NO
Has
the main fan
started
NOW?
NO
• Check the operation
of the main fan by
connecting it to
a permanent mains
supply.
NO
Replace Main
Fan Assembly!
YES
Heater Working!
Does
the burner
go into high limit
trip after a period
of time?
• Check burner pressure for
correct setting.
• Check Overheat Stat for
incorrect limit setting.
• Check fan rotation.
Heater in Overheat.
Refer to section 2.6.4
sub-section 2
Replace
Limit Stat!
YES
Has
the main fan
started
NOW?
Burner
STILL in high
limit trip?
Check function
of main fan
Check R2R board
see sect 3.1.1
Re-check R2R board
see sect 3.1.1
3.1 Fault Finding and Status Indication
YES
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