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NOTE: Rectification of any internal burner component must be done by a qualified burner
engineer.
Symptom
A. Burner will not start
B. Burner starts i.e. burner
motor runs but will not
light and burner goes to
'lockout'.
C. Burner lights but rapidly
extinguishes.
Possible Cause
Action
1. Electrical supply failure
2. Control thermostat time or
water pressure switches or
other boiler systems controls
at fault
3. Manual reset on limit thermostat
tripped (when fitted)
4. When using heavy oil tem
-
pertures incorrect in oil pip-
ing or in burner preheater.
1. Check the following:
a) Main isolating switch of the
burner is on.
b) Overload protective device
of the burner motor.
2. Check that power is available
at the control panel and all
switches are closed.
3. Reset and check also control
stat setting and operation.
4. Check temperatures: ensure
preheating equipment is
operating.
1. Switch off burner. Check spark
plug gap. Check H.T. leads and
connections. Check and clean
ignition electrode(s) and insula-
tor
2. Open door and check whether
oil has been sprayed into
combustion chamber; if no
evidence of spray, clean or
replace burner nozzle(s).
3. Check as above. If no spray,
c h e c k t h e f o l l o w i n g :
a) There is oil in the fuel tank.
b) All necessary valves are
open.
c) The oil filter is clear.
d) There is no airlock in the fuel
pump (listen for any unusual
sound from pump).
e) For air leakage into the fuel
feed pump.
f) The fire valve or fire link has
not closed in oil line.
1. Remove cell, clean and refit.
2. Replace cell with new.
1. No ignition spark.
2. No oil spray into combustion
chamber but pressure indicated
on burner gauge (if fitted).
3. No oil spray into combustion
chamber and no pressure
indicated on the oil gauge.
1. Dirty photocell (causing 'lockout'
action).
2. Faulty photocell (causing 'lock-
out' action).
Oil Burner Fault Finding Chart
Oil Burner Fault Finding Chart
August 2014
