Bentone BENTOFLEX ST 120 KA, Installation And Maintenance Instruction

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Bentone 

8.  Fault Location

8.1  Burner will not start

Symptom

Motor starts 

Burner pre-ventilates

Flame formed

Burner trips

Motor starts 

Burner pre-ventilates

No flame formed

Burner trips

Motor does not start

Causes

Unstable flame 

Excess air

Low oil pressure 

Incorrect combustion apparatus settings 

Flame monitor does not register light 

Defective flame monitor 

Defective oil burner control 

No oil 

False light 

No spark 

Preheater does not get up to temperature.

Remedies

Adjust the damper  

Check the oil pressure 

Check the nozzle in relation to the 

combustion apparatus dimensions and the 

ignition electrode position

Check the flame monitor is clean and can 

register light

Check with using new photocell 

Check using new oil burner control (Note: 

replacement of photocell recommended if oil 

burner control replaced)

Check the oil supply to the burner and that 

there are no air bubbles in the pump

Check function of solenoid 

Check flame monitor does not register 

ambient light 

Check high voltage wiring and ignition 

electrodes

Check preheater function

Symptom

Burner does not start

Burner pre-ventilates

Burner stops

Causes

Fuse blown 

Boiler thermostat has not reset 

Preheater does not get up to temperature

Overheating protection has deployed

Defective preheater 

Defective oil burner control or  

flame monitor

No oil supply

Too great a pressure drop at brake plate 

Too strong draught prevents flame forming 

No spark 

Preheater temperature too low

New oil type

Remedies

Check and replace fuse as necessary. 

Investigate cause of fault 

Adjust thermostat 

Check preheater function

Reset the overheating protection. 

Investigate the cause of its deploying.

Remedy fault

Check by replacing with new 

Check that tank, oil lines, solenoid valves, 

pump and nozzle are in good condition

Adjust the burner

Correct the boiler draught

Check the ignition transformer. Check the 

ignition electrode settings and ceramics

Check preheater function

Adjust the preheater‘s set operating tem-

perature

Check that the oil used has the physical 

parameters that the burner is rated for. If not, 

change the oil.

8.2  Burner will not start after normal use

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