GETTA Help

Frozen boiler condensate pipe: safe next steps

In freezing weather, a blocked condensate pipe can make some condensing boilers stop and display a fault code, but similar symptoms can have other causes.

Likely causes

  • Ice can obstruct an external condensate section, while poor falls or drainage faults can contribute to repeat freezing.

Safe checks you can make

  • Check the boiler instructions and look from a safe position for an accessible external plastic condensate pipe.
  • Do not climb, remove the boiler cover or pour boiling water onto pipework.

When to stop and get urgent help

  • Stop if the pipe is inaccessible, high up, damaged or near electrical hazards, and seek professional help.

How a Gas Safe registered engineer can help

  • A Gas Safe registered engineer can confirm the diagnosis, restore operation safely and assess insulation or routing.