Remeha
Flame instability / poor combustion
Boiler ignites but then shuts down after a few seconds
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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
Blocked burner or injector, Incorrect gas pressure, Faulty ionisation electrode, Flue or air intake restriction
How to Fix / Troubleshooting
Safety first: This is a combustion-related issue. Turn off the boiler and contact a Gas Safe engineer. Do not attempt to adjust gas components yourself.
- Check flue terminal: Ensure the external flue is not obstructed by debris or snow.
- Note conditions: Record whether the fault occurs more in windy or very cold weather; this helps diagnose flue or combustion issues.
- Engineer tasks: Inspect and clean the burner and injector, check gas inlet and burner pressures, verify ionisation current, and confirm correct combustion with a flue gas analyser.
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Repair Difficulty
Professional Required
5/5
Required Part
Burner Assembly
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