EHC
Flue Gas Recirculation / Condensate Issues
Boiler flue terminal shows staining or there is visible steam and smell around it.
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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
Incorrect flue termination, Damaged flue seals, Blocked condensate drain causing leakage at flue, Poor flue slope
How to Fix / Troubleshooting
Safety: Flue gas can contain carbon monoxide. If you suspect flue problems, turn off the boiler and ventilate the area. Do not use the boiler until checked.
User checks:
- Visually inspect the flue terminal for obvious damage or obstruction.
- Ensure no new structures or vents have been installed near the flue outlet.
Engineer checks:
- Inspect the full flue run for correct assembly, slope and support according to EHC instructions.
- Check all flue seals and joints for signs of leakage or staining; replace any damaged components.
- Verify condensate drainage from the boiler and flue; clear any blockages.
Do not operate the boiler until the flue system is confirmed safe and gas-tight.
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Repair Difficulty
Professional Required
5/5
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