FAULT LOCATION
Burner fails to start
Delayed ignition, burners starts violently
Burner fails to start after normal operation
Situation
Motor runs
Burner pre-purges
Flame occurs
Burner locks out
Motor runs
Burner pre-purges
No flame occurs
Burner locks out
Possible causes
Flame instability
Incorrect head settings
Low oil pressure
Excess air
Photocell not seeing light
Photocell failed
Control faulty
False light
No spark
No oil
Remedies
Check nozzle to burner head dimension
and electrode position
Check oil pressure
Adjust air damper
Check that photocell is clean and
unobstructed
Confirm with new photocell
Confirm with new control. (NB. it is
advisable to change the photocell if also
changing control)
Check that photocell is not seeing
ambient light
Check that H.T. leads are sound and are
not arcing other than at electrode gap
Check oil supply to burner - check that
pump is not airlocked
Check operation of magnetic valve
Burner fails to start
Lamp not lit
Motor runs
Burner runs to lockout
Fuse has blown
Appliance thermostat has not reset
Appliance overheat device has operated
Control relay or photocell defective
No oil being delivered
Excessive flue draught is preventing
flame establishment
No spark
Check or replace fuse if necessary.
Check reason for failure
Adjust thermostat
Reset overheat device. Find reason for
its operation and rectify
Check by replacement
Check that tank, oil lines, fire valve, pump
and nozzle are all in good order
Rectify condition
Check ignition transformer. Check
electrode gap and porcelain
Burner pulsates on start-up
only with hot flue
Burner pulsates on start-up
Burner starts violently
Excessive draught
Nozzle partly blocked
Oil pressure too low
Flue blocked or damaged
Fan slipping on shaft
Pump coupling loose or worn
Delayed ignition
Adjust the burner
Replace nozzle
Check and adjust
Check and rectify
Check and retighten
Check and replace
Check the electrode adjustment, see
diagram
Check electrodes for damage
Check H.T. leads for damage and
disconnection
171 915 01 08-01
