Grant
Flame Establishment or Flow Fault
Boiler starts then shuts down after a few seconds, repeatedly attempting to fire.
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Safety Warning
This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.
If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.
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Possible Causes
Poor flame stability due to incorrect air/oil ratio, Blocked filter or nozzle, Faulty flame sensor, Poor water circulation causing rapid overheat
How to Fix / Troubleshooting
Safety: Repeated failed starts can cause unburnt fuel; do not keep resetting the boiler.
User actions:
- Turn off the boiler and call a qualified engineer.
Engineer actions:
- Check combustion settings with a flue gas analyser and adjust air shutter and oil pressure.
- Clean or replace the oil nozzle and filter.
- Test and replace the photocell if it fails to detect a stable flame.
- Verify adequate water circulation and that the pump is operating correctly.
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Repair Difficulty
Professional Required
5/5
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