Glow-worm
Flame instability / poor combustion
Furnace starts then shuts down after a few seconds, radiators lukewarm
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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 injectors, Incorrect gas/air ratio on Glow-worm burner, Flue blockage, Low gas pressure
How to Fix / Troubleshooting
Safety: Poor combustion can produce carbon monoxide. Do not continue to reset the appliance.
User steps:
- Check that the flue terminal is not obstructed.
- Contact a Gas Safe engineer for combustion checks.
Technician steps:
- Inspect and clean the burner and injectors.
- Perform a full combustion analysis and adjust gas valve and air settings as per Glow-worm instructions.
- Check gas inlet pressure and flue integrity.
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Repair Difficulty
Professional Required
5/5
Required Part
Burner Assembly
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