E90-803-001-005-01 – Rev 4
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Fault finding
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.
Fault
Probable cause
Useful Test
Solution
The burner will not
start
1) Lack of voltage.
If there is significantly less
than 24v dc on terminal 9
then the control box will lock
out.
If there is no voltage then
there is an external fault.
Replace control box if
24v dc present.
Investigate reason for
low voltage
Check any thermostats,
switches, fuses, etc to
trace fault.
The burner starts but
no flame is present
and the burner goes
to lockout
No fuel to burner.
No fuel to the nozzle.
No voltage to solenoid
coil
Voltage to coil but not
energizing.
Coil energized but no
oil at pump outlet.
Oil at pump outlet but
none through the
nozzle.
No spark
Check if there is oil present at
the pump inlet
Cover photocell. If burner
fires up ok then photocell
must be detecting a light
source during pre-purge.
If there is still no flame
disconnect photocell. If now
ok then cell must be faulty.
3) Check electrodes, HT leads
and voltage to igniter. If all ok
then igniter is faulty.
1) Check fuel tank,
valves, etc for problems.
2)
Identify source, spark, etc
and remedy.
Replace photocell
Replace coil.
Check valve opening.
Replace if necessary.
Replace nozzle, or check
line for blockage.
Replace igniter.
The burner starts, a
flame is established
but the burner goes
to lockout
Check burner wiring.
Flame recognition.
Expose photocell to good
ambient (or torch) light.
If the problem disappears
then the problem is with the
flame picture
If the problem does not
disappear then the photocell
must be at fault
Remedy wiring
connections.
Reset combustion.
b) Replace photocell.
