De Dietrich Condensate Drainage Problem

Furnace condensate pipe drips or gurgles loudly, with occasional water backing up into boiler

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Possible Causes

Partially blocked condensate trap on De Dietrich condensing boiler, Incorrect pipe fall, Air lock in condensate line, Shared drain connection causing backflow

How to Fix / Troubleshooting

Safety: Condensate is mildly acidic; wear gloves.

Steps:

  • Clean trap: Remove and clean the condensate trap thoroughly. Refill with clean water.
  • Check pipe routing: Ensure the condensate pipe slopes continuously downward and is not lifted at any point.
  • Separate drains: Avoid connecting the condensate line to a drain that can back up (e.g., sink trap) without proper air gap.

Professional help: Persistent issues may require rerouting the condensate line.

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Repair Difficulty

Easy 2/5

Required Part

Condensate Trap
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