Keston
Overheating Casing / Poor Ventilation
Boiler casing feels excessively hot or there is a smell of hot dust or plastic
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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 air intake, Incorrect casing seals, High flue gas temperature, Internal component overheating
How to Fix / Troubleshooting
Safety: Overheating can be a fire risk. Do not cover or obstruct the boiler.
User actions:
- Ensure that ventilation openings around the boiler are not blocked by cupboards, stored items, or decorations.
- Do not hang clothes or place objects on the boiler.
- If burning smells persist, switch off the boiler and call an engineer.
Engineer actions:
- Check combustion with a flue gas analyser and ensure the Keston boiler is correctly set up.
- Inspect the flue and air intake for blockages or incorrect installation.
- Verify that all internal insulation and seals are intact and correctly fitted.
- Identify any components running excessively hot (e.g., pump, PCB) and replace if necessary.
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Repair Difficulty
Medium
3/5
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