E13
Thermona
Flue Gas Temperature Overlimit
Boiler displays E13, burner stops, may be accompanied by unusual combustion noise.
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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 or restricted Thermona flue, Failed flue gas temperature sensor, Incorrect gas/air ratio causing high flue temps, Scaled or partially blocked primary heat exchanger
How to Fix / Troubleshooting
Safety: Risk of flue gas spillage. Do not operate the boiler if flue blockage is suspected.
- Check flue terminal: Inspect the external flue terminal for obstructions and clear them.
- Reset and observe: Reset the boiler and listen for abnormal roaring or whistling that may indicate combustion issues.
- Engineer tasks: A Thermona technician should measure flue gas temperature, inspect and clean the primary heat exchanger, verify gas pressures and combustion with a flue gas analyser, and test/replace the flue gas temperature sensor.
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Repair Difficulty
Professional Required
5/5
Required Part
Flue Gas Temperature Sensor
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