E08
Danstoker
Abnormally Low Flue Gas Temperature
Boiler display shows E08; flue gas temperature too low or condensation alarm on non-condensing Danstoker boiler.
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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
Oversized boiler with low load, Excessive return water temperature drop, Faulty flue gas temperature sensor, Condensing occurring in non-condensing heat exchanger
How to Fix / Troubleshooting
Safety: Turn off power before accessing sensors. Beware of hot surfaces.
- Check sensor accuracy: Compare the flue gas temperature reading with a handheld thermometer or flue gas analyzer. Replace the Danstoker flue gas sensor if it is clearly inaccurate.
- Verify operating conditions: Ensure the boiler is not operating at extremely low load for long periods. Adjust control settings (e.g., enable lead/lag or staging) to avoid short cycling.
- Check return water temperature: Confirm that the return water temperature is within the recommended range for the specific Danstoker model to avoid condensation in the flue passes.
- Inspect for condensation damage: Look for signs of moisture, corrosion, or staining in the flue outlet and boiler rear sections. If present, consult Danstoker documentation for permissible operating ranges.
If E08 persists, a heating engineer should review system design and control strategy.
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Repair Difficulty
Medium
3/5
Required Part
Flue Gas Temperature Sensor
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