30
10090943EN
CONDITION
POSSIBLE CAUSE
REMEDY
4. Oil
pump
Supplies no oil or atomizing
pressure is too low
Severe mechanical noise
Nozzle supplies no oil
Dirty filter in pump
Leaking suction line
Filter in piping is dirty
Pump capacity decreases:
- faulty or worn pump
- damaged pump coupling
Pump sucks air
Vacuum in oil line too high
Solenoid valve in pump does not
function
Clean or replace
Seal
Replace
Replace
Replace
Tighten joints
Replace filter
Check the size of the suction
line
Replace coil or pump
5. Premature flame formation
Burner motor starts, flame
forms under pre-purge
period, then lock-out
occurs.
Leaking solenoid valve
(Danfoss) / leaking shut-off valve
(Suntec)
Clean or replace pump
6. Flame monitoring fault
Burner motor starts, flame
forms, then lock-out occurs.
Flame detector wrong positioned
Dirty flame detector
(Flame) illumination too weak
Faulty flame detector
Faulty control unit
Adjust
Clean
Check burner settings
Replace
Replace
Lock-out during pre-purge
period
Faulty flame detector
Faulty control unit
Replace
Replace
