Fault Finding
43
3
. Burner starts – no flame – goes to lock out
Symptoms Possible Causes Actions
Motor runs Flame instability
Burner pre-purges Carbon/soot on blast tube Clean blast tube
Burner does not fire No oil pressure Check pump drive coupling - replace if failed
Burner lock-out Low oil pressure Check oil pump pressure is correct
Excessive combustion air Adjust air damper setting
Excessive flue draught - CF only Rectify condition (draught stabiliser required?)
False light Check photocell is not sensing ambient light
No ignition spark Check HT lead connections are sound
Check ignition electrode gap is correct
Check for 230V at ignition transformer
Check transformer - replace if faulty
No oil at nozzle Check for sufficient fuel in tank
Check fire valve has not tripped
Check all oil supply valves are open
Check oil line & pump is not airlocked
Check operation of solenoid valve
Check pump drive coupling - replace if failed
Check fuel pump - replace if seized
Restriction in oil supply Check filters, valves and oil lines and rectify
Fuel contamination (water in tank) Check tank, filters, oil line for water
4. Burner fires – goes to lock out
Symptoms Possible Causes Actions
Motor runs Flame instability
Burner pre-purges Carbon/soot on blast tube Clean blast tube
Burner fires Fuel contamination (water in tank) Check tank, filters, oil line for water
Burner lock-out Low oil pressure Check oil pump pressure - reset if necessary
Excessive combustion air Adjust air damper setting
Excessive flue draught - CF only Rectify condition
Photocell not sensing light Check photocell is clean and unobstructed
Photocell failed Replace faulty photocell
Defective nozzle Replace nozzle
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