Expansion tank keeps filling

[209ed]

Hi there - got some central heating problems!

symptoms are... my radiators aren't getting very hot ( dispite boiler being on high ), keep having to bleed loads of air out of rads and now the expansion tank is nearly empty with the ball cock right down so it just keeps filling, but never stops...

Not really sure whats going on

Any help gratefully received

Cheers
Ed

 

[dextrous]

You have a leak

 

[Slugbabydotcom]

You have a leak

My crystal ball says the leak might be under a floor.

 

[JohnD]

and at this time of year it might be caused by an uninsulated pipe bursting when frozen

have a listen for dripping or running water