Unusual condensation in boiler

[Waynes World]

I have a boiler (Potterton Promax 15SL) and after it has been heating the house for a while, when it turns off, warm air gently comes out of the fan unit (which is now off) and the air hits the metal housing of the boiler and condenses, causing it to pool in the bottom of the boiler and eventually drip out there is so much.

Any clever ideas what is causing this or how to fix it? It isn't common, I can find no references on google searches.

See the picture:

 

[king of pipes]

This need attention by a gas safe engineer it could possibly be caused by a leakage of flue gases which is potentially dangerous please do not use the boiler until this is rectified . Kop

 

[Waynes World]

This need attention by a Registered Gas Engineer it could possibly be caused by a leakage of flue gases which is potentially dangerous please do not use the boiler until this is rectified . Kop

Thanks for the reply Kop. I had an engineer out, all inspected and it looked fine. Regarding your flue gas hypothesis ... That wouldn't happen when the unit is off, would it? And this condensation issue ONLY happens when the unit is off. When on and running all is good. Any further thoughts?

 

[king of pipes]

Thanks for the reply Kop. I had an engineer out, all inspected and it looked fine. Regarding your flue gas hypothesis *** That wouldn't happen when the unit is off, would it? And this condensation issue ONLY happens when the unit is off. When on and running all is good. Any further thoughts?

First test would be a flue gas analysis on the flue if you have a failed seal this would allow products of combustion to mix with the incoming air ?? Causing condensation internally , Secondly could it be rain water driving into the flue somehow a gutter leaking ? When the boiler is not in use ? . Couple of things to consider ?

 

[cjg]

This need attention by a Registered Gas Engineer you should not have removed the sealed case cover.

 

[snowhead]

If the situation with the condensation was "fine" and normal then the manufacturer would have fitted a drain in the casing to allow it to drain away.

Needs looking at by another R.G.E who is prepared to investigate correctly and resolve.

 

[Darren nelson]

Been to a few of these where the ribbed condensate hose in boiler splits and leaks. Pools at bottom of combustion chamber

 

[Lou]

(Just bumping a few older threads, they will drop off what is new soon)

Check Out Plumbing News!