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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