Grant
Delayed Ignition
Boiler’s burner starts with a loud bang or puff, sometimes with visible smoke at the flue.
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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
Incorrect electrode position, Excessive oil pressure, Poorly adjusted air shutter, Dirty combustion head
How to Fix / Troubleshooting
Safety: Delayed ignition can stress the boiler and flue. Turn off the boiler and do not continue to use it until checked.
User actions:
- Switch off the boiler at the fused spur and call a qualified oil engineer.
Engineer actions:
- Inspect and correct electrode gap and position as per Grant burner manual.
- Check and adjust oil pump pressure to specification.
- Clean the combustion head and blast tube of soot and deposits.
- Set the air shutter correctly using a flue gas analyser.
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Repair Difficulty
Professional Required
5/5
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