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Problem | Cause | Remedy |
Pulsation on start |
CF - Flue draught incorrect Combustion settings incorrect Faulty nozzle |
CF - Check flue draught Set up as in installation instructions Replace nozzle |
Intermittent lockout |
Bad electrical connection Intermittent flame detection fault Down draught |
Check control box/electrical connections See flame detection fault Extend flue or fit an anti-down draught cowl (CF only) |
Burner motor fails to operate |
Faulty motor or electrical supply to motor Control box fault |
Check for 230V to motor during startup period Replace control box |
Flame detection fault |
Photocell filmed over (dirty) Photocell faulty Control box faulty |
Wipe clean Replace Replace |
Incorrect CO2 |
Air adjustment fault Oil pressure incorrect |
Set up as in installation instructions Set up as in installation instructions |
No oil from nozzle |
No oil at pump Air in pump Nozzle blocked Faulty pump or drive |
Check and refill oil tank/bleed oil line. Check and clean filters & valves from oil tank to boiler. Bleed pump Replace nozzle Replace |
Ignition failure |
Electrode settings incorrect Faulty ignition transformer Open circuit ignition Faulty control box or electrical connections not properly made |
Set up as in installation instructions Replace Check and replace electrodes or high tension leads if necessary Correct electrical control box connections or replace control box |
Burner fails to start |
No power to boiler Faulty boiler thermostat Programmer open circuit Faulty control box |
Check electrical / control circuit Check by temporarily linking out high limit and control thermostats Check programmer Replace |
High smoke number |
Air intake/flue blocked Incorrect combustion settings Oil pressure incorrect Incorrect components used on combustion head Faulty nozzle |
Check & clear air intake/flue Set up as in installation instructions Adjust to correct pressure Check with installation instructions Replace nozzle |
Noisy operation |
Pump noise from air in pump or worn pump Worn motor bearings Fan out of balance |
Bleed air from pump or replace pump Replace motor Replace fan |
Boiling |
Faulty boiler thermostat Short circuit boiler thermostat Thermostat bulb not fully home in pocket No primary water circulation |
Replace if necessary Temporarily take out of circuit to check Ensure bulb is pushed fully home Check system / circulating pump |
Short cycling |
Burner rating incorrect Boiler thermostat differential incorrect External controls not operating correctly |
Correct burner rating Replace boiler thermostat Check and correct external controls |
Oil smells |
Blocked flue, fumes on startup Oil soaked boiler, faulty burner operation, numerous lockouts Odour in boiler room, oil leaks from pipework, flexible hoses connections |
CF - Check flue with gauge and check seals/gaskets RS - Check seals/gaskets Rectify burner operation and lockouts Rectify oil leaks, replace components if necessary |