What to check if a boiler is working but with burner pulses? Troubleshooting support for boilers

If an oil boiler is working but with burner pulses, a heating engineer should check the following. Please note, it is important to always isolate the electricity supply to the boiler before working on the boiler.

Check if there is insufficient air supply - check the air damper setting and the condition of the fan.
Check room ventilation is adequate - please refer to the Boiler's Manual for further support here.
Check the nozzle size and type.

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What to check if a boiler is working but with burner pulses?

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