What are the causes of boiler backfire and steps in how to
prevent it from happening?
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Answer Posted / jose thomas
1. Unburnt fuel leftover in the furnace during previous
operation.
2. Fuel leak to the furnace before ignition.
3. Presence of flue gases in furnace.
4. Pre-purge and post-purge timings are not enough.
5. Incorrect burner settings.
6. Improper ratio of fuel and air volume.
7. Burner malfunctioning /Controller malfunctioning.
8. Outlet damper less opened.
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