Hi,

I have a problem with my central heating system, which I hope someone
could advise me on. I'm not very good with plumbing, so if I am lacking
info, please forgive me and ask for more details.

Anyway, My central heating pipes/rads make quite a lot of noise of
running water, particular upstairs and in the pipes going to upstairs.
The radiators upstairs are a nightmare. One of them is relatively ok,
heat-wise, but it needs bleeding every 2 or 3 days. The other radiators
are cold and appear to be empty. If I open the bleed valves on these
with the thermostat set so the pump and heating is running, then water
drains from the radiator (I can feel suction on the bleed valve.) If I
turn the thermostat so the heating is off, the radiators fill up, but
when they are full, they are still cold (getting full with cold water??)
Sometimes, through bleeding all rads at the same time and then switcing
the bleed valves off, I hear running water, then the header tank
overflow pipe starts spilling water. And that's about it, I'm not sure
where to begin to look.

Does anyone have any ideas or suggestions. I'm quite prepared to call a
plumber out if that's what's necessary, but I'd prefer to know what the
problem is before I did that so he can't try pulling the wool.

Many thanks for reading,
Bob