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12. FAULT-FINDING
BURNER FAULT-FINDING
ELECTRICAL SAFETY - before making any electrical checks, switch off the mains supply to the boiler
FAULT
BURNER WILL NOT START
BURNER STARTS BUT
FLAME NOT ESTABLISHED
FLAME ESTABLISHED BUT
BURNER LOCKS OUT AFTER
A FEW SECONDS
POSSIBLE CAUSE
Control box locked out
High limit stat tripped
System controls satisfied
Fuse blown
Motor or pump seized
No oil supply
Photocell not seeing flame
Air trapped in pump
Solenoid valve faulty
Nozzle blocked
Electrodes incorrectly set
Electrode insulator cracked
Ignition transformer or leads faulty
Low oil pressure
Oil contaminated with water
Oil filter partially blocked
Photocell faulty
Low oil pressure
ACTION
Press orange reset button on front of
burner. NB: ONLY TRY TWICE
Press red reset button (under control
panel) and check function of boiler stat
Ensure all controls are calling for heat
Fit new fuse (5A). If problem persists,
check for short circuit in wiring
Check for rotation, replace as necessary
Check oil level in tank, check oil supply for
adequate flow
Clean photocell, ensure it is fully inserted
Bleed excess air via tapping on oil pump
Check coil for continuity, replace as
necessary
Replace nozzle with one of same
specification (see burner leaflet)
Reset gap and position to settings shown
in burner leaflet
Replace as necessary
Check for spark, check condition of HT
leads, replace as necessary
Check pump pressure and adjust to
settings shown in burner leaflet
Run off oil at burner until free of water and
drain condensation from tank
Wash filter clean with kerosene
Clean photocell, ensure it is fully inserted,
check for damage. Replace as necessary
Check pump pressure and adjust to
settings shown in burner leaflet