D5 — Condensate pump failure

What does D5 mean?

The condensate pump has failed. This pump is essential for removing acidic waste water from high-efficiency boilers.

• Defective condensate pump.
• Blocked condensate pipe.
• Electrical fault to the pump.

Click steps to track your progress.

1. 1

   Check the condensate pipe outside your property for any blockages, especially during cold weather (it may be frozen).

2. 2

   Clear any visible obstructions from the condensate pipe or trap.

3. 3

   Reset the boiler. If the fault persists, contact a qualified heating engineer to inspect or replace the pump.