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View the thread, titled "Combi Boiler water leak." which is posted in Boiler Advice Forum on UK Plumbers Forums.

My son moved to a new build home in Cornwall last November. Yesterday evening he found a quantity of water beneath the Ideal Combi boiler and a steady water drip from the boiler. After clearing up and putting a container beneath the boiler, he went to bed. This morning the water drip had stopped though there was some water in the container.
The builder's plumber visited this morning but could find no cause for the water leak and the boiler pressure was normal.
There is a suggestion that rain water had entered the flue pipe. However, as the flue pipe enters the house horizontally through a wall and not vertically through the roof, this would seem a long shot to me.
If anyone has any suggestions as to a more likely cause of this, hopefully, short lived event I would appreciated hearing from you.
 
Would get the installers back out as it defo shouldn’t have water coming in via the flue
No and it's hard for me to imagine how it would. However, I don't suppose Cornwall will run out of rain, so there will be plenty of opportunity for the flue suggestion to be tested. On a new build site, where work is still going on, I guess it will be down to the building company to sort out the problem it it persists.
 
No and it's hard for me to imagine how it would. However, I don't suppose Cornwall will run out of rain, so there will be plenty of opportunity for the flue suggestion to be tested. On a new build site, where work is still going on, I guess it will be down to the building company to sort out the problem it it persists.

Yep and do you know if it’s effected by the ideal recall notice ?

 
I've had rain enter the air in take on my horizontal flue and end up all over the kitchen worktop.

The rain was horizontal though and has only happened once.
 

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