Glow-worm
Condensate Discharge from Flue
Boiler flue terminal dripping water externally
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Possible Causes
Normal condensate formation with poor drainage, Incorrect flue angle, Blocked condensate trap or pipe, Damaged flue seals
How to Fix / Troubleshooting
Safety: Condensate is mildly acidic; avoid prolonged skin contact. Do not dismantle the flue yourself.
- Assess amount: Light dripping in cold weather can be normal. Heavy or continuous dripping may indicate an issue.
- Check condensate pipe: Ensure the condensate pipe from the boiler to the drain is not blocked or frozen.
- Engineer tasks:
- Check flue angle to ensure it slopes correctly back to the boiler.
- Inspect and clear the condensate trap.
- Inspect flue seals and joints for leaks.
Persistent heavy dripping from the flue should be investigated to prevent staining and damage.
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Repair Difficulty
Easy
2/5
Required Part
Condensate Trap
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