17
BURNER FAILS TO START
BURNER FAILS TO START AFTER NORMAL OPERATION
POSSIBLE CAUSES
SITUATION
REMEDIES
Flame instability
Motor Runs
Check nozzles to burner head dimension
and electrode position
Incorrect head settings
Burner pre-purges
Check oil pressure
Low oil pressure
Adjust air damper
Excess air
Flame occurs
Check that photo cell is clean and unobstructed
Photo cell not seeing light
Burner locks out
Confirm with photo cell
Photo cell failed
Confirm with new control (NB. It is advisable to
change the photo cell if also changing control)
Control faulty
Motor runs
Check that photo cell is not
seeing ambient light
False light
Burner pre-purges
Check that H.T. leads are sound and are not
arcing other than at electrode gap
No spark
No flame occurs
Check oil supply to burner-
check that pump is not airlocked
No oil
Burner locks out
Check operation of magnetic valve.
Check or replace fuse if necessary.
Check reason for failure
Adjust thermostat
Reset overheat device, find reason
for it’s operation and rectify
Check by replacement
Fuse has blown
Appliance thermostat has not reset
Appliance overheat device has operated
Control relay or photo cell defective
Burner fails to start
Lamp not lit
Oil not being delivered
Excess flue draught is preventing
flame establishment
No spark
Burner runs to lockout
Motor runs
Check that oil tank, oil lines, fire valve, pump
and nozzle are all in good order
Rectify condition
Check ignition transformer. Check electrode gap
and porcelains
DELAYED IGNITION, BURNER STARTS VIOLENTLY
Recomission burner
Replace nozzle
Check and recomission
Check and rectify
Check and tighten
Check and replace
Check the electrode adjustment,
see diagram
Check electrodes for damage
Check H.T. leads for damage and disconnection
Excessive draught
Nozzle partly blocked
Oil pressure too low
Flue blocked or damaged
Fan slipping on shaft
Pump coupling loose or worn
Delayed ignition
Burner pulsates on start-up
only with hot flues
Burner pulsates - on start up
Burner starts violently
BOILER/COOKER FAULT FINDING CHART
16
Front of cooker
Baffle
Arrangement
Blanking plate
Flue box door
Boiler burner
combustion
sampling point
Cooker burner
combustion sampling
point
Flue box
sealing plate
and gaskets
Blanking plate
securing screws
Kicker strip securing
screws
Efficiency baffles
0-60 & 0-80 only
(not shown)
Blanking Plate - Fig.7
Sampling Points - Fig.8
Baffle Arrangement - Fig.9