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hmmmm, not sure, i don't think the cold feed is blocked, i read on this forum that the tee section is prone to this, but my rads to squirt water out when being vented, although this takes about 4-5 seconds each time, but then water does come out.

ok i will do what you have suggested and get the ladder out and try it. the thing that i have heard though is radiators can rust inside out or something oer years, especially steel panel radiators, and can cause a hydrogen built up rom the side effects. i am not sure if this is true though -...

i am not an expert or plumber, but as seco services has just said, obviously the lever is faulty, maybe split inside or crud has stopped it working properley over the years. you can buy new bath/shower mixers from £30 upwards from most diy stores. i saw them last week as a matter of fact...

I did think of this but then again it has been fine for years and is not a newly installed system. What else could it be or how can I check to see if air is being sucked in as you have both suggested?

it is open vented. it has a small tank in the loft that feeds it and allows the expanded water to go into. would it make a difference what type of system it is then? sorry i am no expert obviously.

i am having to vent my radiators quite frequently, probably 2 out of every 3 days. i do not know what may cause this. the radiators have been in for years and worked fine, so from what i gather, it cannot be piped up wrongly in the first place. i have heard towel radiators sometimes need...