EOGB X500 - Burner Fault Finding Guide

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Revision 1 01/01/16
Fault Probable cause Useful test Solution
The burner
will not start
Lack of Voltage
Is there 230v onto terminal 9 of the control
box?
Replace control box
If there is no voltage onto terminal 9 then
there is an external fault
Check thermostats, switches, fuses etc to
trace fault
The burner
starts but no
ame is pres-
ent and the
burner goes
to lockout
No fuel to burner Check if there is oil present at the pump inlet Check fuel tank, valves, etc for problems
No fuel to the
nozzle
No voltage to solenoid
coil
Cover photocell. If burner res up ok then
photocell must be detecting a light source
during pre-purge
Identify source, spark, etc and remedy
If there is still no ame disconnect photocell.
If now ok then cell must be faulty.
Replace photocell
Voltage to coil but not
energizing
Test to ensure the coil measures a resistance
of between 2-3 kohms
Replace coil
Coil energized but no oil
at pump outlet
Check valve opening. Replace if necessary
Oil at pump outlet but
none through the nozzle
Replace nozzle, or check line for blockage
No Spark
Check electrodes, HT leads and voltage to
transformer. If all ok then transformer is faulty.
Replace transformer
The burner
starts, estab-
lishes a ame
and locks out
aer 10 secs
Flame recognition (photocell not seeing
ame)
Remove photocell and ensure that it is
covered and not exposed to any light, reset
burner and once the burner establishes
a ame (aer about 12 Secs) expose the
photocell to light
If the burner still goes to lockout, then
check photocell/photocell lead/ control
box
If the burner continues to run, check that
photocell is not obstructed from seeing
the ame, Check combustion settings,
consult EOGB for further information
The burner
starts, and
a ame is
established
instantly and
the burner
goes to
lockout aer
20 secs
Solenoid stem is letting by Disconnect solenoid lead and re-test.
If the burner still establishes a ame then
replace solenoid stem/pump
Solenoid stem is being energised before it
should be
Disconnect any external wiring from terminal
B4 and test solenoid lead for 230v
If voltage disappears when external wir-
ing is removed the fault will be external,
investigate boiler wiring
If voltage remains then replace control
box
The burner
starts, no
ame is
established
and the
burner goes
to lockout
aer 20secs
Flame recognition/stray light Disconnect the photocell/lead, and retest
If the burner does re up for 10 secs the
replace photocell/lead
If the burner does not re the replace
control box
Maintenance / Service
9.3 Fault nding
Below is a list of some scenarios that may lead to a failure causing the burner to go into lockout mode. There are also
some relevant tests and solutions to hopefully overcome any problem that may occur.
Push the reset button to re-start the burner. If the burner then functions correctly the control has simply responded to a
temporary fault. If the burner still fails then a further investigation will be required to correct any fault.