gurgling boiler when i empty kitchen sink

9 May 2015
Reaction score
United Kingdom
gurgling noise from boiler when kitchen sink is emptied. my boilers overflow pipe is connected to the sink drainage. i recently had my boiler overflowing. any ideas on a solution?

it is a two year old modern combi boiler, the vokera compact 25 model.

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You need to get both the sink drain pipe and the condensate piping checked for blockages. I'm assuming this has just started.
Yes it has just started. The boiler only gargles when I drain the sink very quickly with a lot of water in it. Can I easily check for blockages in the condensation and drain pipe by myself or do I need a pro for this.

This gargling developed after my feeding loop was stuck open overnight before I replaced it. I am sure I replaced it perfectly.


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