Cold weather can freeze the plastic condensate pipe serving a condensing boiler, particularly where it runs outside. A blocked pipe can stop the boiler and may produce a fault code.
Understanding the issue
Cold weather can freeze the plastic condensate pipe serving a condensing boiler, particularly where it runs outside. A blocked pipe can stop the boiler and may produce a fault code.
What to check
If the pipe is safely accessible at ground level, gentle warming with warm—not boiling—water or a warm cloth may help. Never dismantle boiler components or work at height.
When to get advice
If the boiler will not reset, the pipe is inaccessible, or you smell gas, stop and get professional help. Prevention can include suitable insulation and checking the external route.
This is general information, not a substitute for inspecting your property. Do not work on gas equipment or live electrical parts unless appropriately qualified. If there is immediate danger, call 999. If you smell gas or suspect a gas escape, leave the affected area and call the National Gas Emergency Service on 0800 111 999 from a safe location. Do not operate electrical switches or use naked flames.
Official guidance
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